model 12 intek horizontal ohv crankcase disassembly and assembly lab #7
TRANSCRIPT
Model 12 Intek Horizontal OHV
Crankcase Disassembly and Assembly
Lab #7
Model 12 Intek Horizontal OHV
Stripping Engine to Bare Block
Lab #7A
Customer Education
Required Tools• 7, 8, 10, 24 mm socket• ½” breaker bar• Ratchet wrench• Extension• 5/8” Combination wrench• 1/8” Allen wrench• Inch pound torque wrench• Foot pound torque wrench• Standard screwdriver• Pliers• Strap wrench• Feeler gauge set• .010 long flat gauge (Or 2 microfiche
cards)• Spark tester• Optional T-30 Torx bit
Customer Education
Systematic Approach
• Technicians need to take their time when disassembling an engine. This is not a race!
• Listen for instruction when to remove the next piece. Do not work ahead!
• Lay assemblies in order as they were removed.
• Put fasteners with removed assemblies, or loosely back in bolt holes.
Customer Education
Let’s Begin
• Close fuel shut-off valve
• Disconnect spark plug ignition lead from spark plug
• Move throttle to stop position
Customer Education
Remove Carburetor Per Lab#2 Instructions
• Use written instructions
Customer Education
Remove Fuel Tank Per Lab#4 Instructions
• Use written instructions
Customer Education
Remove Cylinder Head Assembly
Per Lab#5 Instructions• Use written instructions
Customer Education
Remove Flywheel and Ignition Armature
Per Lab#6 Instructions• Use written instructions
Customer Education
Bring Piston to TDC Compression
• Valve tappets will be at the bottom of their travel
Model 12 Intek Horizontal OHV
Crankcase Disassembly and Assembly
Lab #7B
Customer Education
Bring Piston to TDC Compression
• Valve tappets will be at the bottom of their travel
Customer Education
Remove Crankcase Cover
• Use 10 mm socket• Case cover gasket
will probably be damaged during removal
• Do not pry off cover – It will come off by hand
Customer Education
Inspect Camshaft Gear
• Timing marks of cam gear and crankshaft gear should align
• Draw diagram
Customer Education
Remove Cam Gear and Tappets
• Tilt block• Remove cam gear
by hand• Remove tappets
by hand
Customer Education
Remove Piston/Connecting Rod Assembly
• Use 8 mm socket• Rod cap can only fit
on one way• Long screw is closest
to piston• Dipper held on by
small screw• Piston and rod have
orientation mark
Customer Education
Remove Crankshaft
• Pull out crankshaft by hand
• Use caution not to scratch bearing surface in case
Customer Education
Discuss Crankcase
• Wipe up any remaining oil in case
• Clean all gasket surfaces with gasket scrapper
Customer Education
Reassembly
• Technicians need to take their time when reassembling an engine. This is not a race!
• Listen for instruction when to add the next piece. Do not work ahead!
• Fasteners will need the proper torque values.
• Special procedures will be explained.
Customer Education
Install Crankshaft
• Install crankshaft by hand into cylinder block
• Be careful not to damage bearing
• Position crankpin to 7 o-clock
Customer Education
Install Piston Assembly
• Use ring compressor• Coat piston assembly
and cylinder bore with oil
• Check orientation marks
• DO NOT hammer or force piston assembly into block!
Customer Education
Attach Rod to Crankshaft
• Rod cap only goes on one way
• Long screw goes closest to piston
• Dipper attaches with short screw
• Use 8 mm socket • Torque fasteners to 100
in. lbs• Rotate crankshaft and
check for free movement
Customer Education
Install Tappets and Cam Gear
• Install tappets first
• Align timing marks of cam gear and crankshaft gear
Customer Education
Install Case Cover
• New gasket?• Lubricate governor
gears• Insure governor lever is
laying flat• May need to rotate
crankshaft for governor gears to mesh
• Use 10 mm socket• Torque fasteners in
sequence to 110 in. lbs
Customer Education
Install Cylinder Head Assembly
Per Lab#5 Instructions• Use written instructions
Customer Education
Install Flywheel and Ignition Armature
Per Lab#6 Instructions• Use written instructions
Customer Education
Install Carburetor Per Lab#2 Instructions
• Use written instructions
Customer Education
Install Fuel Tank Per Lab#4 Instructions
• Use written instructions
Customer Education
Test Ignition System
• Use spark tester 19368
• Look for a spark in the run position
• Look for no spark in the stop position
Customer Education
Install Spark Plug
• Use 5/8" spark plug socket
• Torque to 180 in. lbs
• Attach ignition lead
Customer Education
Success!
• Do you have any extra parts?
• Do you have any questions?