Service Manual

CAMSHAFT/CRANKSHAFT 7-11
Crankshaft, Connecting Rod
Connecting Rod Removal
•
Remove:
Piston (see Engine Top End chapter)
Connecting Rod Installation
•
Install:
Piston (see Engine Top End chapter)
Crankshaft Removal
•
Set the engine on a clean surface while parts are being removed.
•
Drain the oil (see Lubrication System chapter).
•
Remove:
Flywheel (see Electrical System chapter)
Camshaft (see Camshaft, Tappet Removal)
Connecting Rod and Piston Assembly (see Engine Top End chapter)
•
Pull the crankshaft [A] out of the crankcase. Tap gently with a wooden
or plastic mallet if necessary to loosen the crankshaft.
Crankshaft Installation
•
Clean up the crankshaft and crankcase thoroughly, especially at the
bearing contact surfaces.
•
Pack some amount of high temperature grease into the oil seal on
the crankcase.
•
Apply engine oil to the PTO side, journal crank pin and bearing.
•
Apply molybdenum disulfide grease.
•
Carefully insert the crankshaft flywheel end into the main bearing and
oil seal in the crankcase.
Cleaning/Inspection
•
After removing, clean the crankshaft and connecting rods with a high
flash-point solvent and dry them with compressed air.
•
Inspect the teeth of the crankshaft gear for pitting, fatigue cracks,
burrs and evidence of improper tooth contact.
Replace the gear if necessary.
•
Inspect the crankshaft and connecting rods especially at the bearing
surfaces for wear, scratches, evidence of improper contact or other
damages.
Replace them if necessary.
Connecting Rod Bend/Twist
•
Measure connecting rod bend.

Select an arbor of the same diameter as the connecting rod big end,
and insert the arbor through the connecting rod big end.

Select an arbor of the same diameter as the piston pin and at least
100 mm long, and insert the arbor through the connecting rod small
end.

On a surface plate, set the big-end arbor on V blocks.

With the connecting rod held vertically, use a height gauge to measure
the difference in the height of the small end arbor above the surface
plate over a 100 mm length to determine the amount of connecting
rod bend.
If connecting rod bend exceeds the service limit, the connecting rod
must be replaced.
Connecting Rod Bend
Service Limit: 0.15/100 mm (0.006/3.94 in.)