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] 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.
The oil ring rails have no "top" or "bottom".
Do not mix up the top and second ring.
Install the top ring [A] so that the "R" mark [B] faces up.
Install the second ring [C] so that the "RN" mark [D] faces
Apply molybdenum disulfide oil solution to the piston
If a new piston is used, use new piston ring.
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.
Do not reuse snap rings, as removal weakens and
deforms them. They could fall out and score the
The piston ring openings must be positioned as shown in
the figure. The openings of the oil ring steel rails must be
about 30 ∼ 40° of angle from the opening of the top ring.
Top Ring [A]
Second Ring [B]
Oil Ring Steel Rail [C] (Upper)
Oil Ring Expander [D]
Oil Ring Steel Rail [E] (Lower)
40 ∼ 50° [G]