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TM10-4320-316-14
(12) Check the thrust surface on both ends of the connecting rod for damage. Replace connecting rod if
necessary.
(13) Check the contact surface of the crank pin bearing insert for separation, melting, seizure, etc. Replace crank
pin bearing insert if it is separated or damaged.
(14) Check that clearance between crank pin and crank pin bearing insert is less than 0.004 inch (0.12 mm).
Replace crankpin bearing insert if clearance exceeds wear limit.
c. Repair. Repair is limited to replacement of defective parts.
d. Installation.
WARNING
Heated parts can result in severe burns. Exercise care in handling the heated parts.
CAUTION
Connecting rod is made of a special aluminum alloy. Avoid damage while handling. Do not drop
or clash against a hard object.
CAUTION
Avoid direct heating of piston with a torch.
(1) Heat piston (5) to 160-180'F.
(2) Position the piston top identification mark "DM" (12) and the ID number on the connecting rod as shown.
(3) Align the small end hole of connecting rod (8) with the piston.
(4) Insert piston pin (7) into the piston pin hole.
(5) Insert two snap lock rings (6) into piston pin holes.
NOTE
Any time piston is removed from engine, new piston rings should be installed.
(6) Measure piston ring end gap of each piston ring.
(7) When inserting the rings, the identification mark should face up.
CAUTION
Piston ring breakage may occur if rings are opened more than necessary when installing.
Never stretch piston rings more than necessary.
NOTE
The top piston ring will have a 'T" on the top surface. The middle piston ring will have
a "2T' on the top surface and the bottom piston ring will have a "1" on the top surface.
(8) Use the piston ring remover tool to install piston rings (9), (10), and (11). Install oil ring, 2nd compression ring,
and 1st compression ring in order.
6-9
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