ENGINE 3-49
PISTON AND PISTON RING
PISTON DIAMETER
• Using a micrometer, measure the piston outside diameter at
15 mm A from the piston skirt end.
• If the measurement is less than the limit, replace the piston.
Piston diameter:
Service Limit: 66.845 mm
at 15 mm from the skirt end
09900-20203: Micrometer (50 – 75 mm)
PISTON-TO-CYLINDER CLEARANCE
• Subtract the piston diameter from the cylinder bore diameter.
(3-48)
• If the piston-to-cylinder clearance exceeds the service limit,
replace the crankcase set or the piston, or both.
Piston-to-cylinder clearance:
Service Limit: 0.120 mm
PISTON PIN AND PIN BORE
• Measure the piston pin bore inside diameter using the small
bore gauge.
• If the measurement is out of specifications replace the piston.
Piston pin bore I.D.:
Service Limit: 14.030 mm
09900-20602: Dial gauge (1/1 000 mm)
09900-22401: Small bore gauge (10 – 18 mm)
• Measure the piston pin outside diameter at three positions
using the micrometer.
• If any of the measurements are out of specification, replace
the piston pin.
Piston pin O.D.:
Service Limit: 13.980 mm
09900-20205: Micrometer (0 – 25 mm)
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