8-5
CYLINDER HEAD/CYLINDER/PISTON
Cylinder Wear Inspection
● Inspect the cylinder wall for scratches and wear.
NOTE
·Inspect the area near T.D.C (Top Dend Center)
carefully. This area is especially subject to wear due
to the possibility of borderline lubrication fro heat
and top ring compression.
● Measure and record the cylinder I.D. at the three levels
in both an X and Y axis.
● Take the maximum reading to determine the cylinder
wear.
NOTE
·Avoid the intake and exhaust ports when measuring.
● Measure the piston O.D.
SERVICE LIMIT : 39.05mm
● Calculate the piston-to-cylinder clearance. Take the
maximum reading to detemine the clearance.
Piston Outer Diameter Inspection
● Measure and record the piston O.D. 90。to the piston
pin bore and at the point specified in the Model
Spectific manual, near the bottom of the piston skirt.
● Replace the piston if the service limit is exceeded.
SERVICE LIMIT : 38.90mm
● Calculate the piston-to-cylinder clearance
● Install the needle bearing and piston pin in the
connecting rod small end and check for excessive play.
● If the piston pin I.D. is over the service limit, the
crankshaft must be replaced. Measure the I.D. of the
connecting rod small end.
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