TM 9-2320-289-34
3-13.
PISTON, CONNECTING ROD, AND CONNECTING ROD BEARING REMOVAL AND
REPAIR (Con’t).
13.
14.
Repeat step 11 for other piston rings.
Gap should be 0.01 18–0.0226 in.
(0.300-0.575 mm) for upper com-
pression ring (1 2), 0.0295-0,0403 in,
(0.750-1 ,025 mm)
for
lower
compression
ring
(11),
and
0.0098-0.0211 in, (0.249-0,535 mm)
for oil control ring (1 O). If any
measurement is not correct, replace
piston rings as a set.
Place upper compression ring (12)
and lower compression ring (1 1 ) in
piston (8) ring grooves and roll entirely
around groove. If there is binding,
remove ring and inspect grooves for
nicks or burrs, Smooth out nicks or
remove burrs with fine cut file.
Install piston rings (9, 10, 11, and 12)
in piston (8) ring grooves. Using feeler
gage, measure side clearance of each
ring.
Clearance
should
be
0.0030-0.0080 in. (0.076-0,203 mm)
for upper compression ring (1 2),
0.0015-0.0041 in. (0.039-0.105 mm)
for lower compression ring (11 ), and
0,0016-0.0048 in. (0,040-0,121 mm)
for oil control ring (1 O). If any
measurement is not correct, replace
piston.
d . A S S E M B LY
N O TE
Ensure that marked side of upper compression ring (12) and lower
compression ring (11) face toward top of piston (8).
1.
Expand upper compression ring (12) and lower compression ring (11 ) and slide into grooves in
piston (8),
2.
Install oil ring expander (9) and oil control ring (1 O) in piston (8) ring groove,
TA50653
3 - 4 2 C h a n g e 2
