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TM 5-4320-306-24
4-11. REPLACE/REPAIR CONNECTING ROD ASSEMBLY (Continued)
NOTE
Clean rust preventive from replacement connecting rod. Also make sure the bearing cap is thoroughly
cleaned to prevent trapped contaminants from adversely affecting the bearing shells.
9
Temporarily reassemble dowel pin (1) and
bearing cap (2) with big-end bolts (3) onto
match-marked connecting rod (4) Tighten bolts
to 22.13 ft-lb (30 N•m) torque. Using a torque
gage, retighten bolts an additional 60 degrees,
then an additional 30 degrees.
10
Measure width of connecting rod (4) with
micrometer. Measurement should be 1.3960
to 1.3984 inches (35.46 to 35.52 mm) If
measurement is outside specified limits, replace
connecting rod.
11
Measure connecting rod bore with inside
micrometer. Measurement should be 2.6771 to
2.6779 inches (68.0 to 68.019 mm). If
measurement is outside specified limits, replace
connecting rod (4) including bearing cap (2),
small-end bushing (5), bearing shells (6), and
big-end bolts (3).
12
Inspect bearing shells.
a.
Inspect upper and lower bearing shells for excessive wear, scoring, pitting, flaking, etching, and signs of
overheating.
b.
Inspect bearing shell backs for bright spots (bearing moving in bearing shells).
c.
Measure bearing shell width. Measurement should be 1.0157 to 1.0236 inches (25.8 to 26.0 mm). If
measurement is outside specified limits, replace bearing shells.
d.
Measure bearing shell wall thickness (1) with a micrometer (2) and ball attachment (3). The minimum
thickness of a worn standard bearing shell is 0.0778 inch (1.976 mm). If measurement is below specified
limit, replace bearing shells.
4-86
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