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TM 10-3930-638-24&P
4-2. ENGINE MAINTENANCE (cont)
f. Pistons and Connecting Rods (cont).
STEP
LOCATION
ITEM
ACTION
REMARKS
INSPECTION (cont)
11
Connecting rod (3)
Inspect
Check for cracks, damage, wear, scoring,
and connecting rod
and pitting. If any of these conditions
cap (2)
observed, replace as an assembly
12
Connecting
a. Piston pin
Measure
Use bore gage, then measure bore gage
rod (3)
bushing (10)
inside diameter
with micrometer. Replace if measure-
ment is greater than 1.2510 inches
NOTE
Perform following step only if piston pin bushing requires replace-
ment.
b. Piston pin
Replace
Use 1-5/16 inches diameter sleeve or rod
bushing (10)
to press from connecting rod. Align oil
hole in replacement bushing with oil hole
in connecting rod before pressing bushing
in. Press until flush with rod. Ream
bushing to 1.2502-1.2504 inches if new
piston pin is to be installed; if old piston
pin is used, ream bushing 0.0004 to
0.0015 inch larger than piston pin
diameter
4-47
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