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 TM 55-1905-219-14-4
3-40.1. PISTON-MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
REASSEMBLY (Cont)
A pre-stressed compression
ring is also used in the
ring groove immediately
below the fire ring.
A two-piece oil control
ring is used in both oil
ring grooves in the pis-
ton and a peripheral
abutment type oil ring
expanders.
PERIPHERAL ABUTMENT
All new piston rings must be
installed whenever a piston
is removed regardless of
whether a new or used pis-
ton or cylinder liner is
installed.
Insert one ring at a time
inside the cylinder liner
and far down enough to be
within the normal area of
ring travel. Use a piston
to push the ring down to
be sure it is parallel
with the top of the liner.
Then measure the ring gap
with a feeler gage. Refer
to ring gap specifications.
3-833
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