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9
11
Engine Specifications. If clearance is
greater than shown the piston must be
replaced.
Figure 4
Check Ring End Gap
It is recommended that the entire ring set be
replaced when servicing the piston and/or
cylinder bore. However, the original rings can be
re-used if they are not damaged and are
checked as follows:
1. Clean all carbon from the rings and the
cylinder bore.
2. Insert an original ring (A, Figure 5)
approximately one inch down into the
cylinder bore.
3. Check end gap with feeler gauge.
Compare with reject dimensions listed in
Section 12 - Engine Specifications. If gap
of any of the rings exceeds the reject
dimension, all rings should be replaced.
Figure 5
Check Connecting Rod
If the crankpin bearing (A, Figure 6) or the piston
pin bearing (B) is scored, the rod must be
replaced.
1. Reinstall rod cap and bolts on rod.
2. Using a dial caliper or plug gauge,
measure the two bearing diameters.
Compare with reject dimensions listed in
Section 12 - Engine Specifications. If
either bearing exceeds the reject
dimensions, the rod must be replaced.
3. Remove rod bolts and rod cap. Set aside.
Figure 6
Assemble
1. Install a pin retainer into one groove in
piston bore. Skip this step if piston has a
shoulder stop on one side.
2. Oil the piston pin bore, connecting rod pin
bore, and the pin. Insert rod into piston,
then slip pin through piston and rod bores
until it seats against the retainer or
shoulder stop.
NOTE: The notch or arrow (A, Figure 7) on the
piston and “MAG” on the rod (B) must face the
same direction. When installed in engine, the
notch will face the flywheel.
Figure 7