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OIL SEAL
Damage to the lip of the oil seal may result in leakage of the fuel-air mixture or oil. Inspect for
damage and be sure to replace the damaged seal if found.
CRANKSHAFT
CRANKSHAFT RUNOUT
Support crankshaft byಯVರ block, with the dial gauge rigged to
read the runout as shown.
Service limit᧶0.05mm(0.002in)
Excessive crankshaft runout is often responsible for
abnormal engine vibration. Such vibration shortens engine life.
Condition of big end bearing
Turn the crankshaft with the connecting rod to feel the
smoothness of rotary motion in the big end. Move the rod up and
down while holding the crankshaft rigidly to be sure that there is
no rattle in the big end.
Wear on the big end of the connecting rod can be estimated by
checking the movement of the small end of the rod. The
method can also check the extent of wear on the parts of the
connecting rod ‘s big end. If wear exceeds the limit, replace
connecting rod, crank pin and crank pin bearing.
Service limit᧶3.0mm(0.12in)
Connecting rod small end inside diameter
Measure the connecting rod small end diameter with a
caliper gauge.
Service limit᧶14.040mm
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