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Page Title:
PISTONS, PISTON PINS, AND RINGS REPLACEMENT - continued |
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 TM 10-3930-673-34
c. Inspection.
(1)
Visually inspect ring grooves, piston
top, piston skirt, and piston pin bore
for cracks or other damage and for
excessive wear.
(2)
Check piston skirt diameter using an
inside micrometer as shown, at a
point approximately 1/2 in. (12.7 mm)
TR01062
above bottom edge of piston.
Minimum allowable skirt diameter is
4.0088 in. (101.82 mm).
(3)
Check top piston ring for nicks,
cracks or other visible defects. Ring
clearance check is not required for
top piston ring.
(4)
Check ring clearance in
intermediate and oil control ring
grooves using new rings and a feeler
gauge as shown. Maximum allowable
clearances for these two grooves are:
Limit
TR01063
Intermediate ring groove
0.006 in.
(0.15 mm)
Oil control ring groove
0.005 in.
(0.13 mm)
(5)
Check piston pin bore diameter at
four points noted. Maximum
allowable bore diameter is 1.5758 in.
(40.03 mm).
TR01064
3-107
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