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ADVANCE PRODUCT SERVICE INFORMATION SUBJECT: NEW INTEK OHV ENGINE No: #56 DATE: 8/07 MODEL: 331777, 331877

Briggs & Stratton has recently introduced the new Model 330000 OHV vertical shaft engine. This engine is very similar to the Model 310000, sharing the same general maintenance, servicing, and troubleshooting procedures. It features a positive-sealing cylindrical air filter cartridge, an improved flywheel fan assembly, and has two lubrication system options: full and partial pressure. The following specifications, part numbers, and/or procedures are PRELIMINARY and subject to change. Dimensions

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Common Specifications SAE Metric

Armature Air Gap .010 - .014" .25 - .36 mm Bore Size 3.7005 ± .0005" 93.99 ± .01 mm Crankshaft End Play .002 - .023" .05 - .58 mm Displacement 32.94 ci 540 cc Oil Capacity - with filter 46 - 48 oz. 1.36 - 1.40 L Spark Plug Gap .030" .76 mm Stroke 3.062" 77.77 mm Valve Clearance - Intake -Cold .003 - .005" .08 - .13 mm

- Exhaust -Cold .005 - .007" .13 - .18 mm Fastener Torque Specs SAE Metric Tool Size Air Cleaner - Intake Elbow 70 lb-in 8 Nm 7/16" Armature 24 lb-in 3 Nm 5/16" Blower Housing 85 lb-in 10 Nm 3/8" Mounting Bracket to Cylinder Head 85 lb-in 10 Nm 3/8" Blower Housing to Intake Elbow 20 lb-in 2 Nm 1/4"

Breather Cover 25 lb-in 3 Nm 5/16" Carburetor Solenoid 45 lb-in 5 Nm 1/2" Carburetor to Manifold 70 lb-in 8 Nm 5/16" Casing Clamp 22 lb-in 2 Nm T-25 Connecting Rod 150 lb-in 17 Nm 5/16"

Control Bracket 30 lb-in 3 Nm 5/16" Crankcase Cover 210 lb-in 24 Nm 1/2" Cylinder Head 220 lb-in 25 Nm 3/8" Cylinder Shield 45 lb-in 5 Nm 5/16" Flywheel Fan Locator Screws 140 lb-in 16 Nm 1/4"

Flywheel Guard 25 lb-in 3 Nm 1/4" Flywheel Screw 100 lb-ft 136 Nm 15/16" Fuel Pump 35 lb-in 4 Nm 3/8" Governor Lever Nut 40 lb-in 5 Nm 3/8" Intake Manifold 100 lb-in 11 Nm 3/8"

Muffler Adaptor 165 lb-in 19 Nm 1/2" or T-40 Muffler Bolts 138 lb-in 16 Nm 1/2" or T-40 Oil Filter Drain Plug 80 lb-in 9 Nm 7 mm Oil Pump Cover 80 lb-in 9 Nm 5/16" Rocker Arm Stud 45 lb-in 5 Nm 5/16"

Rocker Ball Setscrew or Nut 45 lb-in 5 Nm 13 mm or T-40 Spark Plug 180 lb-in 20 Nm 5/8" Deep Starter Drive Cover 25 lb-in 3 Nm 1/4" Starter Motor Bracket 140 lb-in 16 Nm 1/2" Starter Motor thru Bolts 25 lb-in 3 Nm 5/16"

Stator 21 lb-in 2 Nm 1/4" Valve Cover 55 lb-in 6 Nm 3/8"

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Standard Dims. Reject Dims. Dimensions SAE Metric SAE Metric Cylinder Bore Size 3.7010 ± .0005" 94.005 ± .01mm 3.704" 94.08 mm

Mag Bearing 1.3799" 35.05 mm 1.3829" 35.13 mm Mag Bearing Depth (DU) .119" 3.02 mm Cam Bearing .5015" 12.74 mm .5045" 12.81 mm

Cylinder Head

Intake - Valve Seat Angle 45 ± .25 deg 45 ± .25 deg

Valve Seat Width 3/64 - 5/64" 1.19 - 1.98 mm

Valve Guide .237" 6.02 mm .240" 6.10 mm Valve Face Angle 45 ± .75 deg 45 ± .75 deg Valve Stem Diameter .2354" 5.98 mm. 2334" 5.93 mm

Exhaust –

Valve Seat Angle 45 ± .25 deg 45 ± .25 deg Valve Seat Width .031" .79 mm

Valve Guide .237" 6.02 mm .240" 6.10 mm Valve Face Angle 45 ± .75 deg 45 ± .75 deg Valve Stem Diameter .2354" 5.98 mm .2334" 5.93 mm

Crankcase Cover/Sump PTO Bearing 1.6270" 41.331 .6285" 41.36 mm Cam Bearing .5015" 12.74 mm .5045" 12.81 mm

Crankshaft End Play .002 - .023" .05 - .58 mm

Crankshaft Crankpin Journal 1.4986" 38.06 mm 1.4966" 38.01 mm Mag Journal 1.3780" 35.00 mm 1.3760" 34.95 mm PTO Journal 1.6245" 41.26 mm 1.6225" 41.21 mm

Cam Shaft Mag-Side Journal .4995" 12.69 mm .4975" 12.64 mm PTO-Side Journal .4995" 12.69 mm .4975" 12.64 mm

Connecting Rod Crankpin Bearing 1.5003" 38.11 mm 1.5023" 38.16 mm Piston Pin Bearing .8009" 20.34 mm .8029" 20.39 mm

Piston Pin Diameter .8004" 20.33 mm .7994" 20.30 mm

Piston Pin Bore .8008" 20.34 mm .8028" 20.39 mm

Piston Rings End Gap - Top .009" .23 mm .030" .76 mm End Gap - Middle .018" .46 mm .030" .76 mm End Gap - Oil .010" .25 mm .035" .89 mm Ring Land Clearance – Top .002" .05 mm .005" .13 mm Ring land Clearance – Middle .002" .05 mm .005" .13 mm Ring land Clearance – Oil .002" .05 mm .005" .13 mm

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Common Service Parts Air Cleaner Cartridge 793569 Fuel Stabilizer (1 oz) Treats 2.5 gal. 5058 Air Cleaner Pre-Cleaner 793685 Fuel Stabilizer (4.2 oz) Treats 10 gal. 5041 Carburetor Overhaul Kit 792369 Oil SAE 30 100005 (20 oz) 100028 (48 oz) Engine Gasket Set 794150 Oil 5W30 Synthetic (32 oz) 100074 Spark Tester 19368 Oil Filter – Extended Life Series 5076 Flywheel Puller Tool 19203 Spark Plug (resister) 491055 Flywheel Strap Wrench 19433 Spark Plug (resister) –Platinum 5066 Fuel Filter (75 Micron) 394358S Spark Plug Wrench (5/8˝ and 3/16˝) 5067

Air Filter Flywheel

WARNING: DISCONNECT: Spark Plug and Battery (negative terminal).

Pry off CAP.

Fan locator SCREWS.

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Model 330000 engine has two lubrication system options: Full Pressure Lubrication w/Slinger

A. OIL FILTER B. OIL CHANNELS C. OIL PUMP D. SCREENED OIL PICK UP E. CRANKSHAFT BEARING (pressure lubrication) F. OIL CHANNEL - (from filter through crankshaft) G. CONNECTING ROD BEARING (pressure lubrication) H. CRANKSHAFT BEARING (pressure lubrication) Both systems include: Slinger Lubrication

I. GOVERNOR / OIL SLINGER Partial Pressure Lubrication w/Slinger J. OIL FILTER K. OIL CHANNELS L. OIL PUMP M. SCREENED OIL PICK UP N. CRANKSHAFT BEARING (pressure lubrication) O. CONNECTING ROD BEARING with OIL HOLE (slinger lubrication) P. CRANKSHAFT BEARING (slinger lubrication) © 2007 Briggs & Stratton Corporation

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