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TM 9-2320-364-34-4
20-179
NOTE
Piston crown, bearing, and
pin must be replaced as an
assembly.
If wire is not flush or
protrudes slightly from fire
ring groove, replace crown,
bearing and pin.
(8)
Insert 0.100 in. (2.54 mm) “GO” wire in
piston groove gage completely around fire
ring groove (1).
(9)
Insert 0.106 in. (2.692 mm) “NO-GO” wire
in piston groove gage completely around
fire ring groove (1).
NOTE
If diameter is not between
minimum of 4.8104 in. (12.218
cm) and maximum of 4.8134 in.
(12.226 cm), replace piston
crown, bearing and pin.
(10)
Measure piston crown (2) diameter above
fire ring groove (1).
NOTE
If diameter is not between
minimum of 4.4650 in. (11.341
cm) and maximum of 4.4750 in.
(11.367 cm), replace piston
crown, bearing and pin.
(11)
Measure diameter above and below seal
ring groove (3).
NOTE
If diameter is not between
minimum of 3.2360 in. (8.219
cm) and maximum of 3.2370 in.
(8.222 cm), replace piston crown,
bearing and pin.
(12)
Measure diameter above and below bearing
bore (4).
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