TM 10-4320-318-14
6-9. MAINTENANCE OF CONNECTING ROD - (Cont)
(1) Drain oil (LO 10-4320-318-12).
(2) Tip engine over onto flywheel side and remove oil dipstick (14) with O-rings (15).
(3) Remove screws (1), caps (2), bottom cover (3) and O-ring (4) from crankcase (5).
CAUTION
Ensure connecting rod cap has alignment mark to the connecting rod prior to
removal. Uneven wear will occur if connecting rod cap is reinstalled opposite from
original installation.
(4) Remove bolts (6) and connecting rod cap (7).
(5) Remove connecting rod cup (8) with seal (9) from connecting rod cap (7).
(6) Remove lower bearing shell (10) from connecting rod cap (7).
(7) Remove connecting rod (11) through top of crankcase (5).
(8) Remove upper bearing shell (12) from connecting rod (11).
(9) Remove O-rings (15) from oil dipstick (14).
b.
INSPECT.
(1) Check connecting rod for straightness and visible damage. Replace defective connecting rod.
(2) Using inside micrometer, measure inside diameter of piston pin bushing (13). Correct measurement is
0.9850-0.9856 in. (25.019-25.034 mm).
(3) Remove any worn piston pin bushing (13) and press in new bushing.
CAUTION
Make sure oil hole in piston pin bushing line up
Lack of oil lubrication will cause engine damage.
(4) Install rod cap (7) on connecting rod (11).
(5) Apply oil to threads and contact surfaces of connecting
with oil hole in connecting rod.
rod bolts (6).
(6) Install connecting rod bolts (6). Torque bolts to 22 ft·lbs (29.8 N·m).
(7) Using micrometer, measure inside diameter of connecting rod bearing bore. Correct measurement is
1.8108-1.8114 (45.994-46.010 mm).
(8) Replace a defective connecting rod.
(9) Remove connecting rod bolts (6) and cap (7).
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