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5-30 ENGINE TOP END
Cylinder, Pistons
NOTE
○
If a new piston is used, use new piston ring.
•
Install the piston with its marking hollow facing f orward.
•
Fit a new piston pin snap ring into the side of the piston
so that the ring opening [A] does not coincide with the slit
[B] of the piston pin hole.
○
Apply molybdenum disulfide oil solution to the piston pins
and piston journals.
○
When installing the piston pin snap ring, compress it only
enough to install it and no more.
CAUTION
Do not reuse snap rings, as removal weakens and
deforms them. They could f all out and score the
cylinder wall.
•
Install the cylinder (see Cylinder Installation).
Cylinder Wear
•
Since there i s a difference in cylinder wear in different di-
rections, take a side-to-side and a front-to-back measure-
ment at each of t he two locations (total of four measure-
ments) shown in the figure.
If any of the cylinder inside diameter measurements ex-
ceeds the service limit, replace the cylinder.
10 m m (0.39 in.) [A]
60 m m (2.36 in.) [B]
Cylinder Inside Diameter
Standard: 68.400 ∼ 68.412 mm (2.6929 ∼ 2.6934 in.)
Service Limit: 68.50 mm (2.6969 in.)
Piston Wear
•
Measure the outside diameter [A] of each piston 5 mm
(0.20 in.) [B] up from the bottom of the piston at a right
angle to the direction of the piston pin.
If the measurement is under service limit, replace the pis-
ton.
Piston Diameter
Standard: 68.345 ∼ 68.360 mm (2.6907 ∼ 2.6913 in.)
Service Limit: 68.21 mm (2.6854 in.)