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ENGINE
3·51
PISTON AND PISTON RING
PISTON DIAMETER
• Using a micrometer, measure the piston outside diameter at
15 mm (0.6 in) from the piston skirt end.
• If the measurement is less than the limit, replace the piston.
_ Piston diameter:
Service Limit: 72.880 mm (2.8693 in)
at 15 mm (0.6 in)
from
the
skirt
end
iT'Oot,
09900-20203: Micrometer (50 - 75 mm)
15 mm
PISTON TO CYLINDER
CLEARANCE
• Subtract the piston diameter from the cylinder bore diameter.
(c::::r3-50)
• If the piston to cylinder clearance exceeds the service limit,
replace both the cylinder and the piston.
_ Piston
to
cylinder
clearance:
Service Limit: 0.120 mm (0.0047 in)
PISTON PINS
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 1.0.:
Service Limit: 16.030 mm (0.6311 in)
iT'Oot,
09900-20602: Dial gauge (1/1000 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
0.0.:
Service Limit: 15.980 mm (0.6291 in)
iTUh
09900-20205: Micrometer (0 - 25 mm)