TM 5-3825-226-24
PISTONS AND RINGS
Make reference to GUIDELINE FOR REUSABLE PARTS; PISTONS AND CYLINDER
LINERS.
PISTONS AND PISTON RINGS
(1) TOP RING
(2) OIL CONTROL RING*
9L6233
9L9316
Width of groove in piston for piston
1290 ± .0005 in.
1105 ± .0005 in.
ring (new).
(3.276 ± 0.013 mm)
(2.806 ± 0.013 mm)
.1240 +.0000 -.0015 in.
.1085 ± .0005 in.
Thickness of piston ring (new).
(3.150 +0.000 -0.038 mm)
(2.756 ± 0.013 mm)
Clearance between groove and piston
.0030 to .0055 in.
.0010 to .0030 in.
ring (new).
(0.076 to 0.140 mm)
(0.025 to 0.076 mm)
Clearance between ends of piston ring when
installed in a cylinder with a bore size
.0225 ± .0075 in.
0200 ± .0100 in.
of 4.5000 in. (114.300 mm)
(0.572 ± 0.190 mm).
(0.508 ± 0.254 mm)
Increase in clearance between ends of piston
ring for each .001 in. (0.03 mm) increase in
.003 in.
cylinder bore size.
(0.08 mm)
NOTE: 9L6233 Top Ring (1) has the mark "UP-1."
*Install 9L9316 Oil Control Ring (2) with the gap in the spring 1800 away from the gap in the ring.
NOTE: Use 5P3519 PISTON RING GROOVE GAUGE to check the top ring groove only.
(3)
Bore in piston
for pin .........................1.5005 to 1.5009 in. (38.113 to 38.123 mm)
Clearance between pin and bore in
piston (new) ........................0004 to .0012 in. (0.010 to 0.030 mm)
Maximum permissible clearance between piston
pin and bore in piston (worn) .............................. 003 in. (0.08 mm)
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