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5-40 ENGINE TOP END
Cylinder, Pistons
•
Carefully spread the ring opening with your thumbs and
then push up on the opposite side of the ring [A] to remove
it.
•
Remove the 3-piece oil ring with your thumbs in the same
manner.
Piston Installation
NOTE
○
If a new piston is used, use new piston ring.
•
Apply molybdenum disulfide oil solution to the oil ring ex-
pander, and install the oil ring expander [A] in the bottom
piston ring groove so the ends [B] not butt together.
•
Apply molybdenum disulfide oil solution to the oil ring steel
rails, and install the oil ring steel rails, one above the ex-
pander and one below it.
Spread the rail with your thumbs, but only enough to fit
the rail over the piston.
Release the rail into the bottom piston ring groove.
NOTE
○
The oil ring rails have no “top” or “bottom”.
•
Apply molybdenum disulfide oil solution to the piston
rings.
NOTE
○
Do not mix up the top and second ring.
•
Install the top ring [A] so that the “1T” mark [B] faces up.
•
Install the second ring [C] so that the “2T” mark [D] faces
up.
•
Install the piston with its dent mark facing forward.
•
Apply molybdenum disulfide oil solution to the piston pins
and piston journals.
•
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.
When installing the piston pin snap ring, compress it only
enough to install it and no more.
NOTICE
Do not reuse snap rings, as removal weakens and
deforms them. They could fall out and score the
cylinder wall.
•
Install the cylinder (see Cylinder Installation).
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