TM 5-4320-300-14
6-10. PISTONS AND CONNECTING RODS (CONT)
Location/Item
Action
Remarks
13. Piston pin
Inspect for excessive wear or scoring.
bushings
(in piston)
14. Pin-to-bushing
Slide piston pin back into bushing and meas-
clearance
ure pin-to-bushing clearance. The maximum
allowable clearance with new parts is 0.0034
inch (0.0864 mm). The maximum allowable
clearance for worn parts is 0.010 inch
(0.254 mm).
15. Piston pin
Inspect bushings for scoring, overheating, or
bushing (in
other damage. Notice whether bushings have
connecting
moved closer (crept) together in connecting
rod)
rod.
CAUTION
Connecting rod bearing and journal damage may occur if bearing shells and
caps are mixed up. Matchmark shells and caps prior to disassembly.
16. Connecting
Remove bearing cap nuts. Remove bearing cap.
rod bearing
Remove bearing shells. Inspect upper and
shells
lower bearing shells for excessive wear, scoring,
pitting, flaking, etching, and signs of overheat-
ing. Inspect bearing shell backs for bright spots
(bearing moving in supports). Measure bearing
shells with a micrometer and ball attachment.
The minimum thickness of a worn standard
connecting rod bearing shell is 0.1230 inch
(3.1242 mm).
6-82
