12
2
2. Disassemble piston from connecting rod, Fig. 2.
a. Remove piston pin locks.
b. Piston pin is a slip fit in piston and connecting rod.
Keep pistons and connecting rods together as an assem-
bly. Do not mix.
Fig. 2
−
Remove Piston Pin Locks
CHECKING PISTON AND RINGS
If the cylinder is not going to be resized and the piston
shows no signs of scoring, the piston should be checked.
1. Check side clearance of ring grooves using NEW
rings, Fig. 3. If a .005” (0.12 mm) feeler gauge can be
inserted, the ring groove is worn. The piston must be
replaced.
Fig. 3
−
Check Ring Grooves
NEW PISTON RING
2. Check ring end gap, Fig. 4.
a. Clean carbon from end of rings and insert approxi-
mately 1” (25 mm) into cylinder.
Reject Dimension (all): .030” (0.76 mm)
Fig. 4
−
Checking Ring End Gap
ÇÇ
ÇÇ
ÇÇ
3.
Check piston pin bore, Fig. 5.
a.
Replace
if greater than
.6745” (17.13 mm)
or
.0005” (.01 mm)
out of round.
Fig. 5
−
Check Piston Pin Bore
TSM