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ENG
c. Measure piston skirt diameter “P” with the
micrometer.
a
5 mm from the bottom edge of the piston
d. If out of specification, replace the piston and
piston rings as a set.
e. Calculate the piston-to-cylinder clearance
with the following formula.
f. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
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Piston size “P”
Standard 78.965 ~ 78.980 mm
Piston-to-cylinder clearance =
Cylinder bore “C” –
Piston skirt diameter “P”
Piston-to-cylinder clearance
0.020 ~ 0.045 mm
<Limit>: 0.012 mm
EAS00263
CHECKING THE PISTON RINGS
1. Measure:
• piston ring side clearance
Out of specification → Replace the piston
and piston rings as a set.
NOTE:
@
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
Piston ring side clearance
Top ring
0.03 ~ 0.07 mm
<Limit>: 0.12 mm
2nd ring
0.02 ~ 0.06 mm
<Limit>: 0.12 mm
CONNECTING RODS AND PISTONS