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 TM 10-3930-638-24&P
4-2. ENGINE MAINTENANCE (cont)
f. Pistons and Connecting Rods (cont).
REMARKS
ITEM
ACTION
LOCATION
STEP
INSPECTION (cont)
Measure
Use feeler gauge. If measurement exceeds
8
d. Second piston ring
0.008 inch, replace piston
side clearance
(cont)
NOTE
Top piston ring clearance cannot be checked.
Measure
Use micrometer. Measure across thrust
e. Piston diameter
face at bottom of piston, perpendicular
to piston pin holes, as shown. If piston
diameter is less than 3.9940 inches, re-
place piston
Measure
Use micrometer. Replace if measurement
9
Piston pin (9)
Outside diameter
is less than 1.2495 inches
Inspect
Check for damage and loss of resiliency.
10
Retaining ring (8)
Replace if damaged or resiliency is lost
NOTE
Replace connecting rod as an assembly if side clearance check,
performed in step 1 of removal, exceeded 0.011 inch.
4-46
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