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 TM 55-1905-221-14-3
6-27.1. PISTON - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
REASSEMBLY (Cont)
(2)
The top compression (fire)
ring can be identified by
the bright chrome on the
bottom side and black
oxide or copper color on
the top. The pre-stressed
fire ring is further
identified by an oval
mark.
(3)
A pre-stressed compression
ring is also used in the
ring groove immediately
below the fire ring.
(4)
A two-piece oil control
ring is used in both oil
ring grooves in the
piston and a peripheral
abutment type oil ring
expanders.
6-432
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