TM 5-4320-302-14
6-16.
PISTON ASSEMBLY (CONT)
Location/Item
Action
Remarks
16. Piston ring
a.
Use piston to push rings, one at a time,
Push ring in far
gap
down into the cylinder. With a feeler gage,
enough to be in the
measure ring gap according to the following
normal area of ring
chart.
travel, about 1.18
to 1.57 inches (30
to 40 mm).
NORMAL RING
RING GAP
GAP
WEAR LIMIT
inches
inches
PISTON RING
(millimeters)
(millimeters)
Compression
0.0138 to 0.0217
0.0787
rings
(0.35 to 0.55)
(2.00)
Oil control
0.0098 to 0.0157
0.0787
ring
(0.25 to 0.40)
(2.00)
b.
If the compression ring gap measurements are
less than 0.0138 inch (0.35 mm), the gap may
be widened by very carefully filing or stoning.
See step 25 for details. If the oil control ring
gap measurement is less than 0.0098 inch (0.25
mm), replace the oil control ring. If any ring gap
measurement is greater than 0.0787 inch (2.0
mm), replace the piston ring set.
6-116
