ENGINE
3.52
PISTON RING INSTALLATION
NOTE: Apply clean engine oil to all ring surfaces and ring lands. Always check piston ring installed gap before
rings are installed on piston. See page 3.36. If the piston has been in service clean any accumulated carbon
from the ring grooves and oil control ring holes.
1. Place the oil control ring expander in oil ring groove with the end gap facing forward. The expander has no up
or down marking and can be installed either way. The ends should butt squarely together and must not
overlap.
2. Install the oil ring top rail with the end gap at least
30q from the end of the expander .
3. Install the bottom rail with the gap at least 30q from
the end of the expander on the side opposite the
top rail gap.
4. Install the second ring with the “R” mark facing up.
Position the end gap toward the rear (intake) side
of the piston.
5. Install the top ring (chrome faced) with the “R1”
mark facing up and the end gap facing forward
(toward the exhaust).
6. Check to make sure the rings rotate freely in the
groove when compressed.
PISTON INSTALLATION
1. Clean the gasket surfaces on the cylinder and
crankcase. Remove all traces of old gasket material.
2. Make sure the cylinder mounting bolt holes are clean
and free of debris.
3. Install a new circlip on one side of the piston with the
end gap facing up or down.
CAUTION: Circlips become deformed during the removal
process. Do not re-use old circlips. Do not compress the
new clip more than necessary upon installation to prevent
loss of radial tension. Severe engine damage may result
if circlips are re-used or deformed during installation.
4. Apply clean engine oil to the piston rings, ring lands,
piston pin bore, piston pin, and piston skirt. Lubricate
the connecting rod (both ends) and crankshaft main
bearing area.
5. Install the piston on the connecting rod with the pin
casting notch facing the rear of engine (starter side).
The piston pin should be a push fit in the piston.
6. Install the other circlip with the gap facing up or down.
(See Caution with step 3 above). Push the piston pin
in both directions to make sure the clips are properly
seated in the groove.
7. Place the dowel pins in the crankcase and install a
new cylinder base gasket.
Ring Profile
Top
“R1” Mark up
“R” Mark up
Second
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