INSPECTIONIREPLACEMENT/REPAIR - CONTINUED

TM 9-2320-269-34-1

PISTONS AND CONNECTING RODS - CONTINUED

ACTION

LOCATION

ITEM

REMARKS

INSPECTIONIREPLACEMENT/REPAIR - CONTINUED

CAUTION

Because of special heat treatment and hardening of connecting rods, do not try to straighten or bend rod in

any way. This will cause tiny cracks in the hardened surface and will eventually lead to rod breakage.

36.

Connecting rod (1)

Using alinement checking fixture, check

for straightness.

Piston pin bore and connecting

rod

bearing bore must be parallel to

within 0.0005 inch (0.0127 mm).

rod is bent, replace it.

37.

Connecting rod (1)

Bearing cap (2)

Put in place.

38.

Bearing cap (2) and

Two new screws (3), a.

Screw in until snug.

Tighten to 55 ft-

connecting rod (1)

washers (4), and

lb (75 N m) of torque using

11/16-inch

nuts (5)

socket and torque wrench with 1/2-inch

drive.

Using same socket and torque wrench,

turn each nut (5) one-sixth turn, one

flat on nut (5).

39.

Connecting rod (1)

Using 2 to 3 inch range inside micro-

with bearing cap (2)

meter, caliper, measure bore diameter

attached

at several places.

Diameter must be 2.9455 to

2.9460

inches (74.816 to 74.828 mm).

Using micrometer check bore for out-of-

round.

Maximum out-of-round allowed

0.0005 inch (0.0127 mm).

Using micrometer check bore taper at

several places.

Maximum allowable taper is

0.0005

inch (0.0127 mm).

Check bearing shell surfaces for

smoothness without evidence of uneven

bearing contact or movement of shells

in the bore.

2-152