l120 service manual

WORLDWIDE COMMERCIAL & CONSUMER EQUIPMENT DIVISION

2026 December 2002

Lawn Tractors L100, L110, L120, and L130TM2026 DECEMBER 2002

TECHNICAL MANUAL

North American Version Litho in U.S.A.

!TM2026__01DEC02!

!DCG!

JOHN DEERE

INTRODUCTIONManual DescriptionIntroduction

This technical manual is written for an experienced technician and contains sections that are specifically for this product. It is a part of a total product support program. The manual is organized so that all the information on a particular system is kept together. The order of grouping is as follows: Table of Contents Specifications and Information Identification Numbers Tools and Materials Component Location Schematics and Harnesses Theory of Operation Operation and Diagnostics Diagnostics Tests and Adjustments Repair Other NOTE: Depending on the particular section or system being covered, not all of the above groups may be used. The bleed tabs for the pages of each section will align with the sections listed on this page. Page numbering is consecutive from the beginning of the Safety section through the last section. We appreciate your input on this manual. If you find any errors or want to comment on the layout of the manual please contact us.

Safety Specifications and Information Engine (B&S - Single Cylinder) Engine (Kohler - Single Cylinder) Engine (B&S - V-Twin) Engine (Kohler - V-Twin) Electrical Power Train (Gear) Power Train (Hydrostatic) Steering Brakes Attachments

All information, illustrations and specifications in this manual are based on the latest information at the time of publication. The right is reserved to make changes at any time without notice. COPYRIGHT 2002 Deere & Co. John Deere Worldwide Commercial and Consumer Equipment Division All rights reserved Previous Editions COPYRIGHT

Miscellaneous

Introduction

SAFETYSafety

Handle Fluids Safely - Avoid FiresBe Prepared For Emergencies

Recognize Safety Information

MIF

This is the safety-alert symbol. When you see this symbol on your machine or in this manual, be alert to the potential for personal injury. Follow recommended precautions and safe servicing practices.

Understand Signal WordsA signal word - DANGER, WARNING, or CAUTION - is used with the safety-alert symbol. DANGER identifies the most serious hazards. DANGER or WARNING safety signs are located near specific hazards. General precautions are listed on CAUTION safety signs. CAUTION also calls attention to safety messages in this manual.MIF

When you work around fuel, do not smoke or work near heaters or other fire hazards. Store flammable fluids away from fire hazards. Do not incinerate or puncture pressurized containers. Make sure machine is clean of trash, grease, and debris. Do not store oily rags; they can ignite and burn spontaneously. Be prepared if a fire starts. Keep a first aid kit and fire extinguisher handy.

Replace Safety Signs

Keep emergency numbers for doctors, ambulance service, hospital, and fire department near your telephone.

Use Care In Handling And Servicing Batteries

MIF

Replace missing or damaged safety signs. See the machine operators manual for correct safety sign placement.

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Safety

-1

SAFETYPrevent Battery Explosions Keep sparks, lighted matches, and open flame away from the top of battery. Battery gas can explode. Never check battery charge by placing a metal object across the posts. Use a volt-meter or hydrometer. Do not charge a frozen battery; it may explode. Warm battery to 16C (60F). such as earmuffs or earplugs to protect against objectionable or uncomfortable loud noises. Operating equipment safely requires the full attention of the operator. Do not wear radio or music headphones while operating machine.

Use Care Around High-pressure Fluid LinesAvoid High-Pressure Fluids

Prevent Acid Burns Sulfuric acid in battery electrolyte is poisonous. It is strong enough to burn skin, eat holes in clothing, and cause blindness if splashed into eyes. Avoid acid burns by: 1. Filling batteries in a well-ventilated area. 2. Wearing eye protection and rubber gloves. 3. Avoiding breathing fumes when electrolyte is added. 4. Avoiding spilling or dripping electrolyte. 5. Use proper jump start procedure. If you spill acid on yourself: 1. Flush your skin with water. 2. Apply baking soda or lime to help neutralize the acid. 3. Flush your eyes with water for 10 - 15 minutes. 4. Get medical attention immediately. If acid is swallowed: 1. Drink large amounts of water or milk. 2. Then drink milk of magnesia, beaten eggs, or vegetable oil. 3. Get medical attention immediately.MIF

Escaping fluid under pressure can penetrate the skin causing serious injury. Avoid injury from escaping fluid under pressure by stopping the engine and relieving pressure in the system before disconnecting or connecting hydraulic or other lines. Tighten all connections before applying pressure. Search for leaks with a piece of cardboard. Protect hands and body from high pressure fluids. If an accident occurs, see a doctor immediately. Any fluid injected into the skin must be surgically removed within a few hours or gangrene may result. Doctors unfamiliar with this type of injury should reference a knowledgeable medical source. Such information is available from Deere & Company Medical Department in Moline, Illinois, U.S.A. Avoid Heating Near Pressurized Fluid Lines

Wear Protective Clothing

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Wear close fitting clothing and safety equipment appropriate to the job. Prolonged exposure to loud noise can cause impairment or loss of hearing. Wear a suitable hearing protective device

Flammable spray can be generated by heating near pressurized fluid lines, resulting in severe burns to yourself and bystanders. Do not heat by welding, soldering, or using a torch near pressurized fluid lines or other flammable materials. Pressurized lines can be accidentally cut when heat goes beyond the immediate flame area. -2

Safety

SAFETYParking Safely1. Stop machine on a level surface, not on a slope. 2. Disengage PTO and stop attachments. 3. Lower attachments to the ground. 4. Lock park brake. 5. Stop engine. 6. Remove key. 7. Wait for engine and all moving parts to stop before you leave the operators station. 8. Close fuel shut-off valve, if your machine is equipped.MIF

Support Machine Properly and Use Proper Lifting Equipment

Service Machines Safely

If you must work on a lifted machine or attachment, securely support the machine or attachment. Do not support the machine on cinder blocks, hollow tiles, or props that may crumble under continuous load. Do not work under a machine that is supported solely by a jack. Follow recommended procedures in this manual. Lifting heavy components incorrectly can cause severe injury or machine damage. Follow recommended procedure for removal and installation of components in the manual.

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Tie long hair behind your head. Do not wear a necktie, scarf, loose clothing, or necklace when you work near machine tools or moving parts. If these items were to get caught, severe injury could result. Remove rings and other jewelry to prevent electrical shorts and entanglement in moving parts.

Using High Pressure WashersDirecting pressurized water at electronic/electrical components or connectors, bearings, hydraulic seals, fuel injection pumps or other sensitive parts and components may cause product malfunctions. Reduce pressure and spray at a 45 to 90 degree angle.

Use Proper ToolsUse tools appropriate to the work. Makeshift tools and procedures can create safety hazards. Use power tools only to loosen threaded parts and fasteners. For loosening and tightening hardware, use the correct size tools. DO NOT use U.S. measurement tools on metric fasteners. Avoid bodily injury caused by slipping wrenches. Use only service parts meeting John Deere specifications.

Illuminate Work Area SafelyIlluminate your work area adequately but safely. Use a portable safety light for working inside or under the machine. Make sure the bulb is enclosed by a wire cage. The hot filament of an accidentally broken bulb can ignite spilled fuel or oil.

Work In Clean AreaBefore starting a job: 1. Clean work area and machine. 2. Make sure you have all necessary tools to do your job. 3. Have the right parts on hand. 4. Read all instructions thoroughly; do not attempt shortcuts.

Safety

-3

SAFETYWork In Ventilated Area Avoid Harmful Asbestos DustAvoid breathing dust that may be generated when handling components containing asbestos fibers. Inhaled asbestos fibers may cause lung cancer. Components in products that may contain asbestos fibers are brake pads, brake band and lining assemblies, clutch plates, and some gaskets. The asbestos used in these components is usually found in a resin or sealed in some way. Normal handling is not hazardous as long as airborne dust containing asbestos is not generated. Avoid creating dust. Never use compressed air for cleaning. Avoid brushing or grinding material containing asbestos. When servicing, wear an approved respirator. A special vacuum cleaner is recommended to clean asbestos. If not available, apply a mist of oil or water on the material containing asbestos. Keep bystanders away from the area.

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Engine exhaust fumes can cause sickness or death. If it is necessary to run an engine in an enclosed area, remove the exhaust fumes from the area with an exhaust pipe extension. If you do not have an exhaust pipe extension, open the doors and get outside air into the area.

Warning: California Proposition 65 WarningGasoline engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.

Service Tires Safely

Remove Paint Before Welding or HeatingAvoid potentially toxic fumes and dust. Hazardous fumes can be generated when paint is heated by welding, soldering, or using a torch. Do all work outside or in a well ventilated area. Dispose of paint and solvent properly. Remove paint before welding or heating: If you sand or grind paint, avoid breathing the dust. Wear an approved respirator. If you use solvent or paint stripper, remove stripper with soap and water before welding. Remove solvent or paint stripper containers and other flammable material from area. Allow fumes to disperse at least 15 minutes before welding or heating.MIF

Explosive separation of a tire and rim parts can cause serious injury or death. Do not attempt to mount a tire unless you have the proper equipment and experience to perform the job. Always maintain the correct tire pressure. Do not inflate the tires above the recommended pressure. Never weld or heat a wheel and tire assembly. The heat can cause an increase in air pressure resulting in a tire explosion. Welding can structurally weaken or deform the wheel. When inflating tires, use a clip-on chuck and extension hose long enough to allow you to stand to one side and NOT in front of or over the tire assembly. Use a safety cage if available. Check wheels for low pressure, cuts, bubbles, damaged rims or missing lug bolts and nuts.

Safety

-4

SAFETYAvoid Injury From Rotating Blades, Augers And PTO ShaftsDirect exposure to hazardous chemicals can cause serious injury. Potentially hazardous chemicals used with John Deere equipment include such items as lubricants, coolants, paints, and adhesives. A Material Safety Data Sheet (MSDS) provides specific details on chemical products: physical and health hazards, safety procedures, and emergency response techniques. Check the MSDS before you start any job using a hazardous chemical. That way you will know exactly what the risks are and how to do the job safely. Then follow procedures and recommended equipment.

Dispose of Waste ProperlyMIF

Keep hands and feet away while machine is running. Shut off power to service, lubricate or remove mower blades, augers or PTO shafts.

Service Cooling System Safely

Improperly disposing of waste can threaten the environment and ecology. Potentially harmful waste used with John Deere equipment include such items as oil, fuel, coolant, brake fluid, filters, and batteries. Use leakproof containers when draining fluids. Do not use food or beverage containers that may mislead someone into drinking from them. Do not pour waste onto the ground, down a drain, or into any water source. Inquire on the proper way to recycle or dispose of waste from your local environmental or recycling center, or from your John Deere dealer.

Live With Safety

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Explosive release of fluids from pressurized cooling system can cause serious burns. Shut off machine. Only remove filler cap when cool enough to touch with bare hands. Slowly loosen cap to first stop to relieve pressure before removing completely.

Handle Chemical Products SafelyMIF

Before returning machine to customer, make sure machine is functioning properly, especially the safety systems. Install all guards and shields.

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Safety

-5

SAFETY

Safety

-6

SPECIFICATIONS & INFORMATION TABLE OF CONTENTSSpecifications & Information

Table of Contents

Fastener Torques..............................................9 Metric Fastener Torque Values ......................9 Metric Fastener Torque Value - grade 7 ......10 Inch Fastener Torque Values .......................10 General Information........................................12 Gasoline .......................................................12 Gasoline Storage..........................................12 Engine Oil.....................................................12 Engine Break-in Oil ......................................13 Alternative Lubricants...................................13 Synthetic Lubricants .....................................14 Lubricant Storage .........................................14 Mixing Of Lubricants.....................................14 Chassis Grease............................................14 Hydrostatic Transmission Oil........................14 Serial Number Locations ...............................15 Machine Product Identification Number .......15 Engine Serial Number ..................................15 Transaxle Serial Number..............................15

Specifications & Information Table of Contents - 7

SPECIFICATIONS & INFORMATION TABLE OF CONTENTS

Specifications & Information Table of Contents - 8

SPECIFICATIONS & INFORMATION FASTENER TORQUESFastener Torques Metric Fastener Torque Values4.8 Property Class and Head Markings 8.8 9.8 10.9 12.9

4.8 4.8 5 5

8.8 8.8 10 10

9.8 9.8

10.9 10.9 10 10

12.9 12.9 12 1212

12.9

Property Class and Nut Markings

5

10

10

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Class 4.8 Lubricated a Dry a SIZE M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 Nm 4.8 12 23 40 63 100 135 190 260 330 490 675 900 1150 lb-ft 3.5 8.5 17 29 47 73 100 140 190 250 360 490 675 850 Nm 6 15 29 50 80 125 175 240 330 425 625 850 lb-ft 4.5 11 21 37 60 92 125 180 250 310 450 625

Class 8.8 or 9.8 Lubricated a Dry a Nm 9 22 43 75 120 190 260 375 510 650 950 lb-ft 6.5 16 32 55 88 140 195 275 375 475 700 Nm 11 28 55 95 150 240 330 475 650 825 1200 1650 lb-ft 8.5 20 40 70 110 175 250 350 475 600 875

Class 10.9 Lubricated a Dry a Nm 13 32 63 110 175 275 375 530 725 925 1350 lb-ft 9.5 24 47 80 130 200 275 400 540 675 Nm 17 40 80 140 225 350 475 675 925 lb-ft 12 30 60 105 165 225 350 500 675

Class 12.9 Lubricated a Dry a Nm 15 37 75 130 205 320 440 625 850 1075 lb-ft 11.5 28 55 95 150 240 325 460 625 800 Nm 19 47 95 165 260 400 560 800 lb-ft 14.5 35 70 120 109 300 410 580

1075 800 1350 1000

1150 850

1000 1700 1250 1600 1350 2300 1700 2150 1850 3150 2350 2900 2350 4050 3000 3750

1150 2000 1500 1600 2700 2000 2150 3700 2750 2750 4750 3500

1300 950

1200 1850 1650 2500 2100 3200

1150 850

1750 1300 2200

1450 1075 2250 1650 2850

DO NOT use these hand torque values if a different torque value or tightening procedure is given for a specific application. Torque values listed are for general use only and include a 10% variance factor. Check tightness of fasteners periodically. DO NOT use air powered wrenches. Shear bolts are designed to fail under predetermined loads. Always replace shear bolts with identical grade. Fasteners should be replaced with the same class. Make sure fastener threads are clean and that you properly start thread engagement. This will prevent them from failing when tightening.

When bolt and nut combination fasteners are used, torque values should be applied to the NUT instead of the bolt head. Tighten toothed or serrated-type lock nuts to the full torque value. a Lubricated means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings. Dry means plain or zinc plated (Yellow Dichromate Specification JDS117) without any lubrication. Reference: JDS - G200

Specifications & Information Fastener Torques - 9

SPECIFICATIONS & INFORMATION FASTENER TORQUESMetric Fastener Torque Value - grade 7Size Steel or Gray Iron Torque Nm M6 M8 M10 11 24 52 lb-ft 8 18 38 Aluminum Torque Nm 8 19 41 lb-ft 6 14 30 Size Steel or Gray Iron Torque Nm M12 M14 M16 88 138 224 lb-ft 65 102 165 Aluminum Torque Nm 70 111 179 lb-ft 52 82 132

Inch Fastener Torque Values

SAE Grade and Head Markings

1 or 2 No Marks

5

5.1

5.2

8

8.2

2 SAE Grade and Nut Markings No Marks

5

8

MIF

Grade 1 Lubricated a Dry a SIZE 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 Nm 3.7 7.7 14 22 33 48 67 120 190 290 470 570 750 1000 lb-ft 2.8 5.5 10 16 25 36 50 87 140 210 300 425 550 725 Nm 4.7 10 17 28 42 60 85 150 240 360 510 725 950 lb-ft 3.5 7 13 20 31 45 62 110 175 270 375 530 700

Grade 2b Lubricated a Dry a Nm 6 12 22 35 53 75 105 190 190 290 470 570 750 990 lb-ft 4.5 9 16 26 39 56 78 140 140 210 300 425 550 725 Nm 7.5 15 27 44 67 95 135 240 240 360 510 725 950 lb-ft 5.5 11 20 32 50 70 100 175 175 270 375 530 700

Grade 5, 5.1 or 5.2 Lubricated a Dry a Nm 9.5 20 35 55 85 125 170 300 490 725 900 lb-ft 7 15 26 41 63 90 125 225 360 540 675 Nm 12 25 44 70 110 155 215 375 625 925 lb-ft 9 18 33 52 80 115 160 280 450 675

Grade 8 or 8.2 Lubricated a Nm 13.5 28 50 80 120 175 215 425 700 1050 1450 2050 2700 3600 lb-ft 10 21 36 58 90 130 160 310 500 750 1075 1500 2000 2650 Dry a Nm 17 35 63 100 150 225 300 550 875 lb-ft 12.5 26 46 75 115 160 225 400 650

1300 975 1850 1350 2600 1950 3400 2550 4550 3350

1150 850 1650 1200 2150 1550 2850 2100

1300 950 1700 1250 2250 1650

1250 925

1250 930


SPECIFICATIONS & INFORMATION FASTENER TORQUESDO NOT use these hand torque values if a different torque value or tightening procedure is given for a specific application. Torque values listed are for general use only and include a 10% variance factor. Check tightness of fasteners periodically. DO NOT use air powered wrenches. Shear bolts are designed to fail under predetermined loads. Always replace shear bolts with identical grade. Fasteners should be replaced with the same grade. Make sure fastener threads are clean and that you properly start thread engagement. This will prevent them from failing when tightening. When bolt and nut combination fasteners are used, torque values should be applied to the NUT instead of the bolt head. Tighten toothed or serrated-type lock nuts to the full torque value. a Lubricated means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings. Dry means plain or zinc plated (yellow dichromate Specification JDS117) without any lubrication. b Grade 2 applies for hex cap screws (Not Hex Bolts) up to 152 mm (6 in.) long. Grade 1 applies for hex cap screws over 152 mm (6 in.) long, and for all other types of bolts and screws of any length. Reference: JDS - G200


SPECIFICATIONS & INFORMATION GENERAL INFORMATIONGeneral Information Gasoline

c CAUTION: Avoid injury! Gasoline is HIGHLYFLAMMABLE, handle it with care.DO NOT refuel machine while: indoors, always fill gas tank outdoors machine is near an open flame or sparks engine is running, STOP engine engine is hot, allow it to cool sufficiently first smoking Help prevent fires: fill gas tank to bottom of filler neck only be sure fill cap is tight after fueling clean up any gas spills IMMEDIATELY keep machine clean and in good repair - free of excess grease, oil, debris, and faulty or damaged parts any storage of machines with gas left in tank should be in an area that is well ventilated to prevent possible igniting of fumes by an open flame or spark, this includes any appliance with a pilot light To prevent fire or explosion caused by STATIC ELECTRIC DISCHARGE during fueling: ONLY use a clean, approved POLYETHYLENE PLASTIC fuel container and funnel WITHOUT any metal screen or filter To avoid engine damage: DO NOT mix oil with gasoline ONLY use clean, fresh unleaded gasoline with an octane rating (anti-knock index) of 87 or higher fill gas tank at the end of each day's operation to help prevent condensation from forming inside a partially filled tank keep up with specified service intervals Use of alternative oxygenated, gasohol blended, unleaded gasoline is acceptable as long as: the ethyl or grain alcohol blends DO NOT exceed 10% by volume ormif

methyl tertiary butyl ether (MTBE) blends DO NOT exceed 15% by volume IMPORTANT: Avoid damage! DO NOT use METHANOL gasolines because METHANOL is harmful to the environment and to your health.

c CAUTION: Avoid injury! California Proposition

65 Warning: Gasoline engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Gasoline StorageIMPORTANT: Avoid damage! Keep all dirt, scale, water or other foreign material out of gasoline. Keep gasoline stored in a safe, protected area. Storage of gasoline in a clean, properly marked (UNLEADED GASOLINE) POLYETHYLENE PLASTIC container WITHOUT any metal screen or filter is recommended. DO NOT use de-icers to attempt to remove water from gasoline or depend on fuel filters to remove water from gasoline. Use a water separator installed in the storage tank outlet. BE SURE to properly discard unstable or contaminated gasoline. When storing machine or gasoline, it is recommended that you add John Deere Gasoline Conditioner and Stabilizer (TY15977) or an equivalent to the gasoline. BE SURE to follow directions on container and to properly discard empty container.

Engine OilUse the appropriate oil viscosity based on the expected air temperature range during the period between recommended oil changes. Operating outside of these recommended oil air temperature ranges may cause premature engine failure. The following John Deere oil is PREFERRED:

Specifications & Information General Information - 12

SPECIFICATIONS & INFORMATION GENERAL INFORMATION TURF-GARD - SAE 10W-30; PLUS-4 - SAE 10W-30; Other oils may be used if above John Deere oils are not available, provided they meet one of the following specifications: SAE 5W-30 - API Service Classification SG or higher; SAE 10W-30 - API Service Classification SG or higher; SAE 30 - API Service Classification SC or higher. John Deere Dealers: You may want to cross-reference the following publications to recommend the proper oil for your customers: Module DX,ENOIL2 in JDS-G135; Section 530, Lubricants & Hydraulics, of the John Deere Merchandise Sales Guide; Lubrication Sales Manual PI7032. IMPORTANT: Avoid damage! After the break-in period, use the John Deere oil that is recommended for this engine.

Engine Break-in OilIMPORTANT: Avoid damage! ONLY use a quality break-in oil in rebuilt or remanufactured engines for the first 5 hours (maximum) of operation. DO NOT use oils with heavier viscosity weights than SAE 5W30 or oils meeting specifications API SG or SH, these oils will not allow rebuilt or remanufactured engines to break-in properly. The following John Deere oil is PREFERRED: BREAK-IN ENGINE OIL. John Deere BREAK-IN ENGINE OIL is formulated with special additives for aluminum and cast iron type engines to allow the power cylinder components (pistons, rings, and liners as well) to wear-in while protecting other engine components, valve train and gears, from abnormal wear. Engine rebuild instructions should be followed closely to determine if special requirements are necessary. John Deere BREAK-IN ENGINE OIL is also recommended for non-John Deere engines, both aluminum and cast iron types. The following John Deere oil is also recommended as a break-in engine oil: TORQ-GARD SUPREME - SAE 5W-30. If the above recommended John Deere oils are not available, use a break-in engine oil meeting the following specification during the first 5 hours (maximum) of operation: SAE 5W-30 - API Service Classification SE or higher.

PREFERRED

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John Deere Dealers: You may want to cross-reference the following publications to recommend the proper oil for your customers: Module DX,ENOIL4 in JDS-G135; Section 530, Lubricants & Hydraulics, of the John Deere Merchandise Sales Guide; Lubrication Sales Manual PI7032.

Alternative LubricantsConditions in certain geographical areas outside the United States and Canada may require different lubricant recommendations than the ones printed in this technical manual or the operator's manual. Consult with your John Deere Dealer, or Sales Branch, to obtain the alternative lubricant recommendations. IMPORTANT: Avoid damage! Use of alternative lubricants could cause reduced life of the component. If alternative lubricants are to be used, it is recommended that the factory fill be thoroughly removed before switching to any alternative lubricant.


SPECIFICATIONS & INFORMATION GENERAL INFORMATIONSynthetic LubricantsSynthetic lubricants may be used in John Deere equipment if they meet the applicable performance requirements (industry classification and/or military specification) as shown in this manual. The recommended air temperature limits and service or lubricant change intervals should be maintained as shown in the operators manual. Avoid mixing different brands, grades, or types of oil. Oil manufacturers blend additives in their oils to meet certain specifications and performance requirements. Mixing different oils can interfere with the proper functioning of these additives and degrade lubricant performance.

Lubricant StorageAll machines operate at top efficiency only when clean lubricants are used. Use clean storage containers to handle all lubricants. Store them in an area protected from dust, moisture, and other contamination. Store drums on their sides. Make sure all containers are properly marked as to their contents. Dispose of all old, used containers and their contents properly.

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Mixing Of LubricantsIn general, avoid mixing different brands or types of lubricants. Manufacturers blend additives in their lubricants to meet certain specifications and performance requirements. Mixing different lubricants can interfere with the proper functioning of these additives and lubricant properties which will downgrade their intended specified performance.

John Deere Dealers: You may want to cross-reference the following publications to recommend the proper grease for your customers: Module DX,GREA1 in JDS-G135; Section 530, Lubricants & Hydraulics, of the John Deere Merchandise Sales Guide; Lubrication Sales Manual P17032.

Hydrostatic Transmission Oil Chassis GreaseUse the following grease based on the air temperature range. Operating outside of the recommended grease air temperature range may cause premature failures. The following John Deere grease is PREFERRED: NON-CLAY HIGH-TEMPERATURE EP GREASE JDM J13E4, NLGI Grade 2. Multi-Purpose SD Polyurea Grease Multi-Purpose HD Lithium Complex Grease Other greases may be used if above preferred John Deere grease is not available, provided they meet the following specification: John Deere Standard JDM J13E4, NLGI Grade 2. These machines are equipped with a internal wet disc brake transmission. IMPORTANT: Avoid damage! ONLY use HY-GARD J20D oil in this transmission. Mixing of two viscosity grade oils is NOT RECOMMENDED. DO NOT use type F automatic transmission fluid. The following oil is RECOMMENDED: HY-GARD J20D OIL John Deere Dealers: You may want to cross-reference the following publications to recommend the proper oil for your customers: Module DX,ENOIL2 in JDS-G135; Section 530, Lubricants & Hydraulics, of the John Deere Merchandise Sales Guide; Lubrication Sales Manual PI7032.


SPECIFICATIONS & INFORMATION SERIAL NUMBER LOCATIONSSerial Number Locations Machine Product Identification NumberWhen ordering parts or submitting a warranty claim, it is IMPORTANT that the machine product identification number (PIN) and component serial numbers are included. The location of the PIN and component serial numbers are shown.

Transaxle Serial Number

MX9663

Located on back-right side of transaxle.

MX9661

Located on right side of frame.

Engine Serial Number

MX9662

Located on right side of engine.

Specifications & Information Serial Number Locations - 15

SPECIFICATIONS & INFORMATION SERIAL NUMBER LOCATIONS

Specifications & Information Serial Number Locations - 16

ENGINE - 17 HP BRIGGS & STRATTON TABLE OF CONTENTSENGINE - 17 HP BRIGGS & STRATTON

Table of Contents

Specifications .................................................19 General Specifications .................................19 Tests and Adjustments Specifications..........19 Repair Specifications....................................19 Torque Specifications (Alphabetical)............20 Tests and Adjustments ..................................22 Throttle Cable Adjustment............................22 Fuel Shutoff Solenoid Test ...........................22 Governor Adjustment - Static .......................22 Governor Adjustment - Dynamic ..................23 Governor Idle Adjustment.............................24 Slow Idle Carburetor Adjustment..................24 Valve Clearance Adjustment ........................25 Armature Air Gap Adjustment ......................26 Cylinder Leakdown Test...............................26 Fuel and Air Repair.........................................28 Upper Blower Housing Removal and Installation ..............................28 Air Cleaner Service ......................................28 Carburetor Removal and Installation............28 Carburetor Disassembly...............................29 Carburetor Inspection...................................31 Carburetor Assembly....................................31 Breather Valve Service.................................32 Engine Repair..................................................33 Engine Removal ...........................................33 Engine Installation ........................................34 Cylinder Head Removal and Installation ......35 Cylinder Head Inspection and Repair...........37 Valve Removal .............................................37 Valves Reface ..............................................37 Valves Installation ........................................38 Governor Removal and Installation ..............39 Piston, Rings and Rod..................................39 Piston Inspection ..........................................41 Connecting Rod Inspection ..........................41 Cylinder Bore Inspection ..............................43 Cylinder Bore Honing ...................................43 Cylinder Bore Cleaning ................................44 Resizing Cylinder Bore.................................44 Flywheel Removal and Installation...............45 Crankshaft and Cam Gear Removal ............46 Balance System Removal and Installation ...47 Crankshaft/Cam Gear Installation ................48

Magneto Bearing Inspection ........................ 49 Cam Gear Bearing Inspection ..................... 50 PTO Journal Inspection and Seal Replacement ................................ 50 Starting Motor Removal and Installation...... 50 Starting Motor Disassembly......................... 51 Starting Motor Assembly.............................. 53 Starting Motor Pinion Gear Replacement .... 54

ENGINE - 17 HP BRIGGS & STRATTON Table of Contents - 17

ENGINE - 17 HP BRIGGS & STRATTON TABLE OF CONTENTS

ENGINE - 17 HP BRIGGS & STRATTON Table of Contents - 18

ENGINE - 17 HP BRIGGS & STRATTON SPECIFICATIONSSpecifications General SpecificationsMake. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Briggs & Stratton Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/C OHV Model 28 Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314777 Horsepower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.7 kW (17 hp) Cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 cm3 (30.52 cu in.) Stroke/Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overhead Valves Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90.47 mm (3.562 in.) Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77.8 mm (3.06 in.) Crankcase Oil Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.42 L (1.5 qt) Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Cooled Air Cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paper with outer foam element Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Horizontal discharge below frame Aspiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normal Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replaceable (In-Line Type)

Tests and Adjustments SpecificationsValve Clearance Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.08 - 0.13 mm (0.003 - 0.005 in.) Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.13 - 0.18 mm (0.005 - 0.007 in.) Valve Guide Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.12 - 0.15 mm (0.005 - 0.006 in.) Slow Idle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1700 50 rpm Fast Idle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3350 50 rpm Magneto Air Gap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.20 - 0.35 mm (0.008 - 0.014 in.) Spark Plug Gap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.76 mm (0.030 in.)

Repair SpecificationsCylinder Bore, Pistons and Rings: Cylinder Bore Standard Maximum Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90.50 mm (3.563 in.) Minimum Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90.47 mm (3.562 in.) Cylinder Bore Out of Round (maximum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.04 mm (0.0015 in.) Piston Pin (Wear Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.29 mm (0.799 in.) Piston Pin Bore (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.35 mm (0.801 in.) Ring End Gap (Wear Limit) Case Iron Bore: Compression Ring (Top) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.64 mm (0.025 in.) Compression Ring (Center). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.76 mm (0.030 in.) Oil Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.76 mm (0.030 in.) ENGINE - 17 HP BRIGGS & STRATTON Specifications - 19

ENGINE - 17 HP BRIGGS & STRATTON SPECIFICATIONSCompression and Oil Ring Groove Wear Limit (New Ring Installed) . . . . . . . . . . . . . . . . . . . . . . . 0.15 mm (0.006 in.) Valves: Valve Guide (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.09 mm (0.240 in.) Valve Seat Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.79 - 1.98 mm (0.031 - 0.078 in.) Valve Margin (Minimum). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.40 mm (0.016 in.) Valve Face Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 Valve Seat Narrowing Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 Connecting Rod and Crankshaft: Connecting Rod Crankpin (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.32 mm (1.509 in.) Connecting Rod Piston Pin Bearing (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.37 mm (0.802 in.) Crankshaft PTO Journal (Wear Limit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.95 mm (1.376 in.) Crankshaft Magneto Journal (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.95 mm (1.376 in.) Crankshaft Crankpin Journal (Wear Limit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.02 mm (1.497 in.) Crankshaft Eccentric Journal (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.93 mm (2.202 in.) PTO Bearing (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.13 mm (1.383 in.) Magneto Bearing (Wear Limit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.13 mm (1.383 in.) Crankshaft End Play. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.05 - 0.58 mm (0.002 - 0.023 in.) Cam Gear PTO Journal (Wear Limit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.65 mm (0.498 in.) Cam Gear Magneto Journal (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.65 mm (0.498 in.) Cam Lobe (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.07 mm (1.184 in.) Cam Gear Bearing (Wear Limit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.8 mm (0.504 in.) Counterweight: Crankshaft Eccentric Journal (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55.93 mm (2.202 in.) Counterweight Link Bearing (Wear Limit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56.13 mm (2.210 in.)

Torque Specifications (Alphabetical)Blower Housing Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.6 Nm (85 lb-in.) Breather Mounting Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 Nm (55 lb-in.) Breather Reed Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 Nm (30 lb-in.) Carburetor to Intake Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Nm (70 lb-in.) Carburetor Bowl Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Nm (40 lb-in.) Connecting Rod Cap Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Nm (186 lb-in.) Control Bracket Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 Nm (30 lb-in.) Cylinder Head Cap Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Nm (220 lb-in.) Dip Stick Tube Mounting Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 Nm (25 lb-in.) Drive Belt Idler Pulley. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.6 Nm (85 lb-in.) Engine Mounting Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Nm (24 lb-ft) Engine Output Pulley Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Nm (55 lb-ft) Exhaust Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.5 Nm (165 lb-in.) Flywheel Fan Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Nm (140 lb-in.) Flywheel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 Nm (100 lb-ft) ENGINE - 17 HP BRIGGS & STRATTON Specifications - 20

ENGINE - 17 HP BRIGGS & STRATTON SPECIFICATIONSFlywheel Screen Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Nm (40 lb-in.) Fuel Pump Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3 Nm (65 lb-in.) Fuel Pump to Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0 Nm (35 lb-in.) Fuel Shutoff Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Nm (40 lb-in.) Governor Arm Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Nm (40 lb-in.) Heat Shield Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Nm (40 lb-in.) Ignition Armature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 Nm (25 lb-in.) Intake Manifold Elbow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.3 Nm (100 lb-in.) Rocker Arm Adjustment Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.8 Nm (60 lb-in.) Rocker Arm Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.3 Nm (100 lb-in.) Starting Motor Mounting Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Nm (140 lb-in.) Starting Motor Through Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Nm (50 lb-in.) Stator to Cylinder Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 Nm (21 lb-in.) Spark Plug. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Nm (180 lb-in.) Sump Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Nm (180 lb-in.) Throttle Valve Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Nm (40 lb-in.) Valve Cover Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 Nm (55 lb-in.) Voltage Regulator/Rectifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3 Nm (65 lb-in.)

ENGINE - 17 HP BRIGGS & STRATTON Specifications - 21

ENGINE - 17 HP BRIGGS & STRATTON TESTS AND ADJUSTMENTSTests and Adjustments Throttle Cable AdjustmentReason: To make sure the throttle cable moves the throttle through its full range of movement. Procedure:A

A M95224

3. Disconnect wire from solenoid (A). 4. Momentarily place a jumper wire from solenoid terminal to battery positive terminal. NOTE: If battery voltage drops below 9 volts when cranking engine or while engine is running, the solenoid will not function.M95232

B

1. Move throttle lever to FAST idle position (detent). 2. Hole in governor control lever must align with hole (A) in governor control plate. 3. Loosen throttle cable clamp (B). 4. Slide the throttle cable left or right to align holes. 5. Tighten throttle cable clamp (B).

5. If solenoid now clicks, the solenoid is working properly. Results: Solenoid is operating properly if a click is heard when ignition switched from OFF to ON.

Governor Adjustment - Static(Engine OFF)

Fuel Shutoff Solenoid TestReason: To test proper operation of fuel shutoff solenoid. Required Tools: Jumper wire Procedure: 1. Listen for an audible click when ignition switch is turned from OFF to ON. 2. If solenoid does not click, problem could be in equipment wiring.

c CAUTION: Avoid Injury! Before starting or

running engine, static adjustment of the governor must be made. Failure to make static adjustments first, could result in engine overspeeding, and may result in engine or equipment damage causing personal injury and/or property damage.

NOTE: All linkage must be installed to make adjustment. Reason: To set the initial engine speed limits. Procedure:

ENGINE - 17 HP BRIGGS & STRATTON Tests and Adjustments - 22

ENGINE - 17 HP BRIGGS & STRATTON TESTS AND ADJUSTMENTSIMPORTANT: Avoid damage! When servicing engine (when the engine is running), it is important to remove hood to avoid damage from muffler exhaust heat source. 1. Remove hood assembly. See Hood Removal and Installation on page 375 in the Miscellaneous section.A

2. With engine running move throttle lever to FAST idle position. 3. Measure engine rpm.

M95236

1. Loosen governor lever bolt and nut (A). 2. Move throttle lever to FAST idle position. IMPORTANT: Avoid damage! Do not bend governor link or distort governor lever. 3. While holding throttle in fast position use a flat blade screwdriver to turn governor shaft clockwise until it stops. 4. Hold lever and shaft in position and tighten governor lever bolt and nut to specification. Specification: Lock nut. . . . . . . . . . . . . . . . . . . . . . . . 4.5 Nm (40 lb-in.)To Increase Speed

A

Governor Adjustment - Dynamic(Full Throttle No Load) Reason: To verify the engine speed settings are within limits. Equipment: JT07270 Pulse Tachometer

M95237

IMPORTANT: Avoid damage! Do not bend governor link or distort governor lever. 4. Bend the upper governor spring anchor (A) to adjust the top no load engine rpm to specification. 5. Bend the anchor up to lengthen the spring to increase the rpm, or down to shorten the spring to reduce the engine rpm.10 mm (0.375 in.) slot 6 mm (0.250 in.) deep both ends

c CAUTION: Avoid Injury! Before starting or

running engine, static adjustment of the governor must be made. Failure to make static adjustments first, could result in engine overspeeding, and may result in engine or equipment damage causing personal injury and/or property damage.

NOTE: All linkage must be installed to make adjustment. Procedure:

57 mm (2.25 in.)

146 mm (5.75 in.)

M95238

Specification: Top No Load rpm . . . . . . . . . . . . . . . . . . . . 3350 50 rpm


ENGINE - 17 HP BRIGGS & STRATTON TESTS AND ADJUSTMENTSGovernor Idle AdjustmentReason: To set the governed idle speed. Equipment: JT07270 Pulse Tachometer Procedure: IMPORTANT: Avoid damage! When servicing engine (when the engine is running), it is important to remove hood to avoid damage from muffler exhaust heat source. 1. Remove hood assembly. See Hood Removal and Installation on page 375 in the Miscellaneous section. 2. Start engine and run at 1/2 throttle for 5 minutes to bring engine to operating temperature. 3. Move throttle to idle position.M95239 C D

7. Bend tang (C) until it contacts remote control slide (D). Specification: Governor Idle rpm . . . . . . . . . . . . . . . . . . . 1700 50 rpm

Slow Idle Carburetor AdjustmentA

Reason: To set the carburetor mixture screws for proper operation of the carburetor. Equipment: JT07270 Pulse Tachometer IMPORTANT: Avoid damage! In order to obtain correct operation of the carburetor, the adjustment procedure must be performed in the sequence shown.M95222

B

Procedure: IMPORTANT: Avoid damage! When servicing engine (when the engine is running), it is important to remove hood to avoid damage from muffler exhaust heat source. 1. Remove hood assembly. See Hood Removal and Installation on page 375 in the Miscellaneous section. 2. Start engine and run at 1/2 throttle for 5 minutes to bring engine to operating temperature. 3. Move throttle to idle position.

4. Hold throttle shaft (A) in closed position with finger, adjust idle speed screw (B) to 1200 rpm. 5. Release throttle. 6. Set throttle to 1700 50 rpm.


ENGINE - 17 HP BRIGGS & STRATTON TESTS AND ADJUSTMENTSProcedure:A

1. Starting with a cold engine, remove valve cover. 2. Turn crankshaft until piston is at Top Dead Center, (TDC) on the compression stroke (both valves closed).

B

A M95222

4. Turn idle speed screw (A) to obtain 1750 rpm minimum. 5. Remove the limiter cap from the idle mixture screw (B). 6. Then turn idle mixture screw (B) slowly clockwise until engine just begins to slow. Note position of slot on screw. 7. Now turn idle mixture screw (B) in counterclockwise direction until engine just begins to slow. Note position of slot on screw. 8. Turn screw to midpoint between speed changes.M95245

3. Insert a screwdriver through the spark plug opening (A) until it touches the top of the piston. 4. Continue to turn the crankshaft clockwise until the piston has moved down 6.35 mm (0.25 in.).

C

M95231

9. Install limiter cap (C) with flat facing up. 10.Move throttle control from idle to high speed position. Engine should accelerate smoothly. If it does not, open idle mixture needle screw 1/8 turn. There should be no afterfire. Specification: Carburetor Slow Idle Speed. . . . . . . . . . . . . . . .1750 rpm

B

M95246

5. Check valve clearance with a feeler gauge between valve stem and rocker arm. Valve clearance should be 0.08 - 0.13 mm (0.003 - 0.005 in.) for the intake valve, and 0.13 0.18 mm (0.005 - 0.007 in.) for the exhaust valve. 6. If not, adjust as necessary using a 13 mm open end wrench and a 5 mm hex wrench. Tighten lock nut to 6.8 Nm (60 lb-in.). 7. Recheck clearance and make adjustments if necessary. 8. Install valve cover.

Valve Clearance AdjustmentNOTE: Correct position of crankshaft is necessary to eliminate interference by the compression release mechanism on the cam gear when adjusting valve clearance.


ENGINE - 17 HP BRIGGS & STRATTON TESTS AND ADJUSTMENTSSpecifications: Lock nut. . . . . . . . . . . . . . . . . . . . . . . . 6.8 Nm (60 lb-in.) Valve Clearance Intake . . . . . . . . . . . . . . 0.08 - 0.13 mm (0.003 - 0.005 in.) Exhaust . . . . . . . . . . . . 0.13 - 0.18 mm (0.005 - 0.007 in.) between the armature and the magnet. Specifications: Armature Air Gap . . . . 0.25 - 0.35 mm (0.010 - 0.014 in.) Armature Mounting Screws . . . . . . . 2.8 Nm (25 lb-in.)

Armature Air Gap AdjustmentReason: To set the ignition air gap for proper operation and timing of the ignition system. Equipment: 0.30 mm (0.012 in.) Thickness Gauge Procedure:

Cylinder Leakdown TestReason: To check pressure capacity of piston rings and cylinder bore for efficient engine operation. Equipment: JTO3502 Cylinder Leak Tester

Procedure: IMPORTANT: Avoid damage! When servicing engine (when the engine is running), it is important to remove hood to avoid damage from muffler exhaust heat source. 1. Remove hood assembly. See Hood Removal and Installation on page 375 in the Miscellaneous section.

B A

c CAUTION: Avoid Injury! Engine will be HOT. Donot touch with bare skin, especially the exhaust pipe or muffler while making test. 2. Warm engine to operating temperature, then stop engine. 3. Move transaxle shift lever to NEUTRAL. Lock park brake.B C M95220

1. Rotate flywheel until magnet (A) is away from armature laminations. 2. Loosen the armature mounting screws (B) and slide armature away from flywheel as far as possible. 3. Tighten one screw enough to hold the armature in place. 4. Rotate flywheel until magnet is directly under armature laminations. 5. Place a 0.30 mm (0.012 in.) thickness gauge (C) between armature and magnet. 6. Loosen the mounting screw so magnet will pull armature against thickness gauge. 7. Tighten both mounting screws (B) to specification. 8. Rotate flywheel while pulling thickness gauge out from

A

C

MX9745

4. Remove the flywheel screen and use a socket with a breaker bar (A) on the flywheel nut to hold the flywheel in position when performing the test.


ENGINE - 17 HP BRIGGS & STRATTON TESTS AND ADJUSTMENTS5. Remove air cleaner element from engine so you can listen for air leaks through carburetor input (B). 6. Use flywheel mounting cap screw to turn flywheel and find approximate top dead center (TDC) of the compression stroke by removing spark plug and using a wooden dowel on top of piston. 7. Ground ignition high tension lead (C) using JDM-74A-5 Ignition Test Plug to protect ignition system and install test kit adapter hose into spark plug hole.B

D

E

G

F MX9746 M85623

8. First turn regulator knob (D) on tester OFF (fully counterclockwise) then attach appropriate air source to coupler below black regulator valve. 9. Gradually turn regulator knob clockwise until needle aligns with zero of the yellow SET scale (E).

10.Connect adapter hose (F) to tester. Watch and record gauge reading while listening for excessive air leaks at carburetor intake (B), and exhaust outlet (G). Pressure should hold steady or reduce only slightly. 11.Remove test equipment and install spark plug. Tighten spark plug to 20 Nm (180 lb-in.). 12.Install hood. Results: Leakage should not exceed 25%; if so, listening at the carburetor (intake valve), oil filler (piston rings) or muffler (exhaust valve) for escaping air will provide clues as to where to investigate for problems. Air Leaks - Carburetor: slight . . . . . . . . low-to-moderate wear to intake valve excessive . . . . . . . . . . . .intake valve bad, fix or replace Air Leaks - Exhaust Outlet: slight . . . . . . . . low-to-moderate wear to intake valve excessive . . . . . . . . . . exhaust valve bad, fix or replace Gauge Color Codes: Green (low) . . . . . . . . . . . . . . . . . . . . .compression good Yellow (moderate) . . . . . . . . . . compression borderline Red (high) . . . . . . . . . . . . . . . . . . . . . . . compression bad

c CAUTION: Avoid injury! Before attaching

adapter hose (F) hose to tester, make sure another person is holding on tight to breaker bar in top dead center (TDC) position. When compressed air is applied, there will be considerable torque forcing piston and crankshaft to turn.


ENGINE - 17 HP BRIGGS & STRATTON FUEL AND AIR REPAIRFuel and Air Repair Upper Blower Housing Removal and InstallationProcedure: IMPORTANT: Avoid damage! DO NOT use petroleum solvents, such as kerosene, to clean paper cartridge. They may cause cartridge to deteriorate. DO NOT oil paper cartridge. DO NOT use pressurized air to clean or dry paper cartridge. 1. To service dual element, remove cover (A). 2. Remove cartridge (B) and foam pre-cleaner (C). 3. Wash pre-cleaner in liquid detergent and water. 4. Squeeze it dry in a clean cloth. 5. Saturate it in engine oil. Wrap it in clean absorbent cloth and squeeze to remove excess oil.A

6. Clean cartridge by tapping gently on a flat surface. If very dirty, replace. 7. Reinstall pre-cleaner, cartridge, and cover.

Carburetor Removal and InstallationProcedure:

MX9660

A

1. Remove four screws (A) holding the outer blower housing in place. 2. Lift outer blower housing up and off of engine. 3. Remove the screw holding the dipstick tube in place. 4. Install in reverse order of removal. Specifications: Blower Housing Screws. . . . . . . . . . . 6.2 Nm (55 lb-in.)B

Air Cleaner ServiceProcedure:

MX9658

1. Remove blower housing and air cleaner assembly. 2. Remove the breather tube (A) and two nuts (B) securing the air cleaner base.C B

A MX9653

ENGINE - 17 HP BRIGGS & STRATTON Fuel and Air Repair - 28

ENGINE - 17 HP BRIGGS & STRATTON FUEL AND AIR REPAIRE F G E I

H

C D M95224

3. Remove fuel line (C) and drain into a properly identified gasoline container. 4. Disconnect the plug connected to the fuel shutoff solenoid (D). 5. While supporting the carburetor in one hand, loosen and remove the two studs holding the carburetor to the intake manifold. 6. Carefully pull the carburetor away from the intake manifold and rotate the carburetor to disengage the choke linkage (E), governor link (F) and governor link spring (G). 7. Remove carburetor and gasket. Reassemble in reverse order.

M95230

2. Install choke link to outer hole (H) of choke lever on carburetor. 3. Position gasket in place on the carburetor and slide choke link (E) into slot (I) in choke control bracket. 4. Making certain that the gasket is in place, install the carburetor bolts and tighten to specification. IMPORTANT: Avoid damage! Be sure breather tube is not kinked and that it is installed onto nipple as far as possible. 5. Install the air cleaner base and breather tube. Tighten the base screw to specification and the two nuts to specification. 6. Install air cleaner base support bracket and tighten to specification. 7. Install fuel line and fuel line clamp. 8. Install air cleaner cartridge, pre-cleaner and cover. Specifications: Air cleaner base support bracket . . . 4.5 Nm (40 lb-in.) Air cleaner base . . . . . . . . . . . . . . . . . . . 6 Nm (55 lb-in.)

c CAUTION: Avoid Injury! Static governor

adjustment must be made whenever carburetor or manifold has been removed from engine. Failure to make static adjustments first could result in engine overspeeding and may result in engine or equipment damage causing personal injury or property damage.

1. Connect governor link and governor link spring to throttle lever.

Carburetor DisassemblyProcedure: 1. Remove fuel shutoff solenoid and fuel bowl washer. 2. Remove float bowl and float bowl gasket from carburetor. 3. With a small punch, drive the float hinge pin out of float hinge. Remove float and fuel inlet valve assembly.


ENGINE - 17 HP BRIGGS & STRATTON FUEL AND AIR REPAIRB E F L K

D

C

M95229

4. Rotate throttle shaft and lever (B) to closed position and remove two throttle valve screws (C). 5. Remove throttle valve (D), throttle shaft with lever (B), and foam seal (E). 6. Remove throttle shaft seal or bushing from carburetor (F).M G N I J H

M95225

10.Using 1/4-20 self-threading screw or tap (K), threaded into fuel inlet seat (L) 3-4 turns and remove screw or tap.

L

M95228

M95226

7. Rotate choke shaft (G) to wide open position. 8. Pull choke valve (H) out of choke shaft and lever. 9. Remove choke shaft and lever, return spring (I), and foam washer (J).

11.Place 1/4-20 nut and washer (M) on a 1/4-20x1in. screw to use as a puller. 12.Place the hex end of a 1/4 in. drive 3/8 in. socket (N) over fuel inlet seat (L). 13.Place the puller screw through the socket and thread it into the tapped inlet seat until the screw bottoms. 14.Thread nut down onto the washer and socket and continue turning nut until inlet seat is free from carburetor body.


ENGINE - 17 HP BRIGGS & STRATTON FUEL AND AIR REPAIRCarburetor InspectionIMPORTANT: Avoid damage! A clean fuel system is necessary in order to maintain proper operation of the engine. Gummy or dirty fuel tanks and carburetors should be cleaned in a carburetor cleaner such as Bendix Carburetor cleaner or equivalent. DO NOT soak rubber, neoprene or plastic parts in cleaner. Procedure: 1. Check all moving parts for wear, nicks and burrs. Replace, if worn or damaged. 2. Check float for leaks or damage. Replace, if damaged or leaking. 3. Using dry compressed air, carefully blow through all passages. 4. Inspect idle mixture needle for bent or grooved point. Replace if grooved or bent.G M95228 H E D C

F

2. Insert spring inside large foam seal (C) and slide seal and spring onto choke shaft (D) with straight end of spring up toward choke shaft lever. 3. Insert choke shaft (D) into carburetor body until hook of spring hooks on spring anchor (E). 4. Lift choke shaft (D) up slightly and turn counterclockwise until stop on lever clears spring anchor and push shaft down. 5. Insert choke valve (F) into choke shaft (D) with dimples (G) toward fuel inlet (H) side of carburetor. Dimples help to hold and align choke valve on shaft.

Carburetor AssemblyIMPORTANT: Avoid damage! When assembling the carburetor, use new seals and gaskets. Procedure:

A

J K B I L M

N

O

M95227

M95229

1. Carefully press new fuel inlet seat (A) into carburetor body until seat is flush with fuel inlet boss (B).

6. Install throttle shaft seal (I) with sealing lip down in carburetor body until top of seal is flush with top of carburetor. 7. Install throttle shaft (J) and small foam washer (K). Turn shaft until flat (L) is facing out. 8. Lay throttle valve (M) on shaft with numbers (N) toward idle mixture screw and dimples facing in resting on edge of shaft.


ENGINE - 17 HP BRIGGS & STRATTON FUEL AND AIR REPAIR9. Install two screws (O) to secure throttle valve to shaft and tighten to specification. 10.Insert inlet needle valve in slot on float. 11.Place float and needle in carburetor and install float hinge pin, centering hinge pin. 12.Place bowl gasket on carburetor body, 13.Place bowl on carburetor and install float bowl washer and fuel shutoff solenoid and tighten to specification. Specification: Fuel Shutoff Solenoid torque . . . . . . 4.5 Nm (40 lb-in.) Throttle valve . . . . . . . . . . . . . . . . . . . 4.5 Nm (40 lb-in.) 4. Remove and check the breather reed (A). If the reed is worn or bent, the breather reed must be replaced. 5. Install the breather reed and tighten the screw (B) to specification. NOTE: When installing breather, make sure breather gasket is located properly. 6. Install breather using a new gasket and tighten the two screws to specification. 7. Install breather tube in breather. Specification: Breather Reed Screw . . . . . . . . . . . . . . . 4 Nm (35 lb-in.) Breather Mounting Screws . . . . . . . . 6.2 Nm (55 lb-in.)

Breather Valve ServiceIMPORTANT: Avoid damage! A leak at the seal between the tube and crankcase cover, or at the seal at the upper end of the dipstick, can result in a loss of crankcase vacuum and a discharge of oil or smoke through the muffler. Procedure: NOTE: The engine utilizes a breather valve to control and maintain a vacuum in the crankcase. The breather valve closes on the up stroke of the piston and opens on the down stroke of the piston to maintain a vacuum in the crankcase. This vacuum prevents oil leakage past piston rings, valve guides, oil seals, governor shaft and gaskets. 1. Remove flywheel to access breather. 2. Remove breather tube from breather. 3. Remove two screws holding breather and remove breather gasket. Discard old gasket.

A B

MX9657


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIREngine Repair Engine RemovalProcedure: 1. Turn all switches OFF and disconnect battery negative () cable. 2. Remove mower deck. 3. Raise hood. Disconnect light harness on right side of hood. Lower hood to approximately 3/4 open and slide off bracket.K A

7. Loosen clamp (H) to disconnect throttle cable (I).

c CAUTION: Avoid Injury! Gasoline is explosive.8. Disconnect fuel solenoid wire (J), and hose clamp (G) and slide fuel line off hose barb on carburetor.

Do not expose to flame or spark. Serious injury can result. Store in a properly marked, safe container. Wipe-up any spills IMMEDIATELY.

B F L

D C C

MX11568

9. Disconnect wires from starter terminal (L). 10.Disconnect wires from stator and fuel shutoff solenoid (K).

E MX11566

4. Remove two cap screws (C), and lower heat shield (E) from machine frame. 5. Remove three cap screws (B), and lower muffler (D) from exhaust manifold (F). 6. Remove two cap screws (A) securing exhaust manifold (F) to engine. Remove exhaust manifold (F).

M

O

G H

N MX9729

11.Lock park brake to relieve tension on traction drive belt, and remove traction drive belt (M) from around pulley (O). 12.Remove cap screw (N), lock washer, and washer securing pulley assembly (O) to engine output shaft. Remove pulley assembly. 13.Remove four cap screws securing engine to frame.J

I

14.Remove engine.MX11567

ENGINE - 17 HP BRIGGS & STRATTON Engine Repair - 33

ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIREngine InstallationProcedure: 1. Install engine in machine frame. 2. Install four cap screws, washers, and nuts securing engine to frame. Tighten to 32 Nm (24 lb-ft).K

A

L B F MX11568

8. Connect wires to starter terminal (L).

D C C G H E MX11566

3. Install exhaust manifold (F), with new gasket, to engine flange. Secure with two cap screws (A). Tighten cap screws (A) to18.5 Nm (165 lb-in.) . 4. Inspect muffler flange for flatness. Install muffler (D) onto frame and secure with three mounting bolts (B). Tighten mounting bolts (B) to 18.5 Nm (165 lb-in.). 5. Install heat shield (E). Secure with two cap screws (C) to front frame mounting brackets.J

I

MX11567

9. Connect and adjust throttle cable (I) with clamp (H). See Throttle Cable Adjustment on page 22.M

10.Connect fuel solenoid wire (J), and fuel line and clamp (G). 11.Connect battery negative (-) cable. Specification:

O

Engine Mounting Bolts . . . . . . . . . . . . . 32 Nm (24 lb-ft) Exhaust Manifold Bolts . . . . . . . . . 18.5 Nm (165 lb-in.) Output Pulley Assembly . . . . . . . . . . . . 75 Nm (55 lb-ft)N MX9729

Heat Shield Screws . . . . . . . . . . . . . . 4.4 Nm (40 lb-in.) Drive Belt Idler Pulley . . . . . . . . . . . . 9.6 Nm (85 lb-in.)

6. Install engine output shaft key and pulley assembly (O). Secure with washer, lock washer and cap screw (N). Tighten cap screw to 75 Nm (55 lb-ft). 7. Install traction drive belt (M) onto small end of pulley (O).


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIRCylinder Head Removal and InstallationRemoval: IMPORTANT: Avoid damage! Mark all parts when disassembling cylinder heads to prevent interchanging. 1. Disconnect spark plug leads and remove spark plugs. 2. Remove air cleaner assembly, carburetor and blower housing. 3. Remove intake manifold and governor control bracket and linkage. 7 3 1M95244 A A

5

2

4

8

6

6. Remove eight cylinder head bolts.

M95240

4. Remove four cap screws (A) securing valve cover.C

B

M87024

7. Remove cylinder head, cylinder head gasket and push rods.D

Installation: IMPORTANT: Avoid damage! Do not use sealer of any kind on gaskets.

E MX9649

NOTE: Mark the push rods for reassembly in their original position. The exhaust valve push rod is identified with a red stripe. 5. Remove rocker arm support screws (B), rocker arms (C), rocker arm pivots (D), and push rods (E). ENGINE - 17 HP BRIGGS & STRATTON Engine Repair - 35

ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIR Final step = 24.9 Nm (220 lb-in.) NOTE: Match the marking for the push rods from disassembly. The exhaust valve push rod is identified with a red stripe.C

B

E D M87024

1. Place new gaskets and cylinder head on cylinder. Align head with cylinder head alignment sleeves (E) located in the cylinder. 2. Apply approved lubricant to bolts threads and install eight cylinder heads bolts. IMPORTANT: Avoid damage! Do not tighten one bolt down to final torque before all others are tightened to the second step, as it may cause a warped cylinder head. 3. Tighten eight bolts down evenly by hand. Then, using torque wrench, tighten cylinder head bolts in sequence. 5 2 4E MX9649

5. Install push rods (E), rocker arm pivots (D), rocker arms (C), and arm support screws (B). Tighten to specification. 1 4

8 3 6M95240

2

7 3 1M95244

6. Install valve cover with new gasket and tighten using the crossing pattern shown. Tighten to specification. 7. Install intake manifold and tighten to specification. 8. Install blower housing. 9. Install governor control bracket and linkage. 10.Install carburetor and adjust governor linkage. See Governor Adjustment - Static on page 22. 11.Install air cleaner assembly. 12.Install spark plug and plug wire.

4. Using the pattern shown above, tighten the cylinder head bolts in a three step process to final specification. First step = 8.5 Nm (75 lb-in.) Second step = 16.9 Nm (150 lb-in.)


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIRSpecification: Head Bolts (Final) . . . . . . . . . . . . . . 24.9 Nm (220 lb-in.) Rocker Arm Screws . . . . . . . . . . . . 11.3 Nm (100 lb-in.) Valve Cover Screws . . . . . . . . . . . . . . . 6.8 Nm (60 lb-ft) Intake Manifold Bolts . . . . . . . . . . . 11.3 Nm (100 lb-in.)C D E

retainer locks can be removed.

Cylinder Head Inspection and RepairProcedure: IMPORTANT: Avoid damage! Use care to prevent combustion chamber deposits from entering push rod or oil return cavity in cylinder. Take care not to damage cylinder, top of piston, cylinder head and cylinder head gasket surfaces. Remove only the combustion chamber deposits. It is not necessary to remove the discoloration marks on the piston, valves and cylinder head. These marks are normal and will not affect engine operation. 1. Remove combustion chamber deposits from combustion chamber and around valves using a soft, hand wire brush or scraper. With piston at top dead center, remove combustion chamber deposits from top of piston. 2. Inspect cylinder head for broken fins or cracks.

F

MX9659

Valve RemovalProcedure: 1. Remove the valves, place cylinder head on workbench with support to hold valves in place.A

4. Release pressure and remove the valve spring retainer locks (C), valve spring retainer (D), valve spring (E), and valve (F) from the cylinder head. 5. Repeat procedure on other valve.

Valves RefaceProcedure:

B

MX9652

2. Thread a rocker arm support screw (A) into the cylinder head. 3. Using a valve spring tool (B), depress the valve spring retainer and spring to compress spring until valve spring

M87026


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIRIMPORTANT: Avoid damage! Always replace valve stem seals whenever valves are removed for servicing. 1. To remove valve stem seals, grasp seal with pliers and pull up on seal while turning.C B A

Valves InstallationProcedure: 1. If rocker arm studs were removed, coat with hardening sealant before installation. 2. Install rocker arm studs and tighten to 9.6 Nm (85 lbin.). 3. Valve stems and guides must be free of foreign material and burrs or valve sticking will occur and valve stem seals will be damaged.

M87027

2. Faces on valves may be resurfaced with a valve grinder to 45 (A). Valve seats can be reconditioned using Valve Seat Cutter. Valves and seats should then be lapped with Valve Lapping Tool and Valve Lapping Compound. Remove grinding marks and assure a good seal between valve and seat. Thoroughly clean lapping compound from valve seat and valve face. 3. Valve seat width (B) should be 0.79 - 1.98 mm (0.031 - 0.078 in.). 4. If seat is wider, it may be narrowed using Valve Seat Cutter. Use 30 side of cutter to narrow the seats. 5. If the valve is badly burned, it should be replaced. Normal valve margin (C) is 0.8 mm (0.030 in.). Replace valve if margin is 0.4 mm (0.0156 in.) or less or is badly burned or damaged. (Valve seats are not replaceable.) 6. Inspect valve springs and replace if broken or worn. NOTE: Valve guides are not serviceable. 7. Inspect valve guides by inserting plug gauge into valve guide. If plug gauge inserts 6.35 mm (0.250 in.) or more, the cylinder head must be replaced. If plug gauge is not available, the rejection dimension for both intake and exhaust valve guides is 6.09 mm (0.240 in.). Specification: Valve seat width . . . . . . . . . . . . . . . . . . . 0.17 - 1.57 mm (0.046 - 0.062 in.) Valve Margin (minimum) . . . . . . . . . 0.4 mm (0.0156 in.) Valve Guide Reject Dimension (both) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.09 mm (0.240 in.) Valve Face Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Valve Narrowing Angle. . . . . . . . . . . . . . . . . . . . . . . . . 30 6. Place valve spring over valve stem.C

M87026

4. Oil inside diameter of valve stem seal with engine oil and install on valve stem. Press seal down over intake valve guide. NOTE: Be sure valve guide lubricant is not on valve face, valve seat, or exposed end of valve stem. 5. Lightly coat valve stems with a valve guide lubricant and install valve into valve guide.D

MX9652

7. Place retainer on spring. Insert valve spring tool (C) to the rocker arm support screw (D) and depress the valve spring retainer.


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIR8. Compress spring until valve stem extends through end of retainer. Continue to press until the valve spring retainer locks can be put into the groove on the valve stem. Be sure locks are fully engaged in valve stem groove. 9. Gradually release pressure on the valve spring tool until the retainer locks seat into the retainer. 10.Install cylinder head on engine block. See Cylinder Head Removal and Installation on page 35. 11.Set valve clearance. See Valve Clearance Adjustment on page 25. Specifications: Rocker Arm screws . . . . . . . . . . . . 11.3 Nm (100 lb-in.) 6 7 5 3A

9

1 4 10 8

2

Governor Removal and InstallationProcedure: 1. Drain oil from sump. 2. Remove all rust, foreign material and burrs from crankshaft. 3. Remove sump screws and remove sump and sump gasket.

M95235

6. Install sump and gasket being sure screw #9 has non hardening sealant on the threads (A). 7. Tighten all screws using the pattern indicated above to specification. 8. Complete installation of remaining governor linkage and carburetor. 9. Adjust governor. See Governor Adjustment - Static on page 22.

3 4

Specifications: Sump Cover . . . . . . . . . . . . . . . . . . . . 20 Nm (180 lb-in.)

2

Piston, Rings and Rod1

Procedure: 1. Remove air filter and bracket, upper blower housing, flywheel, alternator, carburetor and governor linkage.M95234

1. Oil Slinger 2. Governor Gear

3. Governor Cup 4. Cam Gear

NOTE: Remove any carbon or ridge at the top of the cylinder bore. This will prevent breaking the rings when removing the piston and connecting rod from the engine. 2. Remove starter, cylinder heads and crankcase cover. IMPORTANT: Avoid damage! When servicing pistons, rings, piston pins or rods, each rod, piston, piston pin and ring set must be kept as a set. Mark each set before removing from the engine. 3. Remove the connecting rod cap. Then push the piston and connecting rod out through the top of the cylinder.

4. Inspect governor gear and bearing, flyweight pivots, and governor cup for wear or damage. 5. Before installing sump, be sure that governor cup is in line with governor shaft paddle.


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIR

B A M95249

4. To remove connecting rod from piston, rotate piston pin retainer (A) until one end is exposed in notch (B) in piston pin bore. 5. With a needle nose pliers, grasp end of piston pin retainer and pull in and up to remove. 6. From opposite side of piston, push piston pin out of piston and connecting rod. Piston pin is a push fit in piston and rod. Deposits may build up on piston pin and require the piston pin to be pressed out.M87038

NOTE: Oil control ring is shown being spiraled into compression ring groove. 9. Spiral top oil control ring from oil ring groove into center compression ring groove. Repeat into top compression ring groove, and then off piston. Repeat for bottom oil control ring. NOTE: If the cylinder is to be resized, there is no reason to check the piston, since a new oversized piston assembly must be used. If however, the cylinder is not to be resized and the piston shows no signs of wear or scoring, only the piston rings must be replaced. 10.Insert old rings one at a time approximately 25.4 mm (1.0 in.) down into the cylinder bore.

M86904

IMPORTANT: Avoid damage! New piston rings must be installed whenever the engine is disassembled for major servicing or overhaul, providing that cylinder bores are within specifications. 7. Remove top and center compression rings using ring expander. NOTE: Measure cylinder bores before checking pistons and rings. If cylinder bores require re-sizing it will not be necessary to check pistons and rings since a new oversized piston assembly will be used. 8. If cylinder bore is more than 0.08 mm (0.003 in.) oversize, or 0.04 mm (0.0015 in.) out of round, it must be resized.M86906

c CAUTION: Avoid Injury! Wear gloves or cover

rings with a rag. The top and bottom edges of the ring may be extremely sharp. Personal injury to hand could occur. Never reuse worn piston rings.

11.Check end gap with feeler gauge. If ring gap is greater than 0.64 mm (0.025 in.) for the top compression ring and 0.76 mm (0.030 in.) for the center compression ring and the oil ring, the ring is worn and should be replaced. ENGINE - 17 HP BRIGGS & STRATTON Engine Repair - 40

ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIRNOTE: Before installing new piston rings, the cylinder bore should be reconditioned using a rigid hone with finishing stones. This will restore the proper cross hatch angle in the cylinder bore. The correct cylinder cross hatch ensures proper lubrication and piston ring rotation. 12.A worn ring will usually show scratches caused by abrasives and/or have a shiny appearance. Never reuse worn piston rings. Specifications: Cylinder Out of Round (maximum) 0.04 mm (0.0015 in.) Cylinder Oversized (maximum). . . . 0.08 mm (0.003 in.) Ring End Gap (maximum) Top Compression . . . . . . . . . . . . . . . 0.64 mm (0.025 in.) Center Compression . . . . . . . . . . . . 0.76 mm (0.030 in.) Oil Control . . . . . . . . . . . . . . . . . . . . . 0.76 mm (0.030 in.)M88925

Connecting Rod InspectionProcedure:

1. If the crankpin bearing in the connecting rod is scored, the rod must be replaced. Reject size of crankpin bearing and piston pin bearing is as follows: 2. Replace connecting rod if either bore is worn.

Piston InspectionProcedure: 1. Clean carbon from top two ring grooves. 2. Place a new ring in each piston groove.

M88926

3. If piston pin is worn 0.01 mm (0.005 in.) out of round or below reject size, it must be replaced. Reject sizes for piston pin and piston pin bore are as follows:M86905 A

3. If a 0.15 mm (0.006 in.) or larger feeler gauge can be inserted in the compression ring or the oil ring grooves, the compression and ring grooves are worn and the piston should be replaced. Specifications: Ring Groove Clearance (maximum) 0.15 mm (0.006 in.)

M88927

4. The piston pin is a slip fit in both piston and connecting rod. 5. Use a thin nose pliers or screwdriver and install a piston pin lock in groove on one side of piston. 6. Piston must be installed with notch or arrow (A) toward flywheel side of cylinder. Dot on piston can face either direction.


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIR7. Insert piston pin from opposite side of piston until pin stops against piston pin lock. Then install other piston pin lock. Be sure both locks are seated in grooves.

C

B M88930 A MX9650

8. Install oil ring expander coil spring (A) first. Spiral oil control ring (B) into top ring groove, then into second ring groove and into position over expander coil spring. 9. Position gap of oil ring expander coil spring approximately 180 from oil control ring. 10.The correct piston ring positions are shown above. The second (C) compression ring is installed with ID mark toward top of piston. 11.Using ring expander, install center compression ring then, top compression ring as shown above. 12.Apply oil to piston rings, piston skirt.

14.Tighten ring compressor until rings are fully compressed. Then loosen ring compressor very slightly so that compressor can be rotated on piston skirt while holding connecting rod. 15.Thoroughly clean and then oil cylinder bore.F

E D M88932

NOTE: The pistons have offset piston pin bores. Position the notch or arrow (E) on piston is facing toward the flywheel side (F) of engine.M88929

13.Place piston and ring compressor (D) upside down on bench and push down until head of piston and edge of ring compressor are even.

16.Rotate crankshaft until crankpin journal is at bottom of stroke. This permits complete entry of compressed rings, piston and rod assembly, when pushed into cylinder. 17.Clean and oil crankshaft crankpin.


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIRCylinder Bore InspectionProcedure:B C I D

J A K M88933

18.Pull connecting rod against crankpin. 19.Install rod cap with the notch in the connecting rod (I) engaged to the tab on the connecting rod.M86883

IMPORTANT: Avoid damage! The connecting rod screws MUST be tightened in the sequence listed. Failure to use a torque wrench in the correct sequence can result in breakage or scoring. 20.Install connecting rod screws and tighten the screw closest to the piston (J) first. Tighten the screw farthest from the piston (K) second. 21.Rotate crankshaft two (2) revolutions to check for binding. Rod should also be free to slide sideways on crankpin. Specifications: Crankpin bearing . . . . . . . . . . . . . . 31.80 mm (1.252 in.) Piston pin . . . . . . . . . . . . . . . . . . . . 20.29 mm (0.799 in.) Piston pin bore . . . . . . . . . . . . . . . . 20.35 mm (0.801 in.) Piston Pin Wear (maximum) . . . . . . 0.01 mm (0.005 in.) Connecting rod screws . . . . . . . . . . 21 Nm (185 lb-in.)

1. Always inspect cylinder after engine has been disassembled. Visual inspection will show if there are any cracks, stripped bolt holes, broken fins or if the cylinder walls are damaged. Use a telescoping gauge, and dial caliper, or an inside micrometer (A) to determine the size of the cylinder bore. Measure at right angles at six points: top (B), center (C), and bottom (D). 2. If the cylinder bore is more than 0.08 mm (0.003 in.) oversize, or 0.04 mm (0.0015 in.) out of round, it must be resized, or replaced. See Resizing Cylinder Bore on page 44. 3. If cylinder bores are within specification and show no signs of scoring or other damage, new pistons rings may be installed providing the cylinder bores are reconditioned using a rigid hone with finishing stones. This will restore the proper cross hatch angle in the cylinder bores. The proper cylinder cross hatch ensures proper lubrication and piston ring rotation. Specifications: Standard bore size (minimum) . . . 90.47 mm (3.562 in.) Standard bore size (maximum). . . 90.50 mm (3.563 in.)

Cylinder Bore HoningProcedure: NOTE: To produce the proper cross hatch finish use a drill speed of approximately 200 rpm and 40 - 60 strokes per minute. Lubricate hone liberally to prevent build up on finishing stones.


ENGINE - 17 HP BRIGGS & STRATTON ENGINE REPAIRResizing Cylinder BoreA

Procedure:

A

M86885

1. The cylinder finish, (Cross Hatch) should be applied after cylinder bore has been resized to within 0.038 mm (0.0015

l120 service manual

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