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TM 5-2410-237-23
PISTONS, CONNECTING RODS, AND BEARINGS MAINTENANCE - CONTINUED
0245 04
ASSEMBLY - CONTINUED
Table 1. Pistons and Piston Rings
(6) TOP RING
(7) INTERMEDIATE RING
(8) OIL CONTROL RING
Width of groove in piston for
0.1588 0.0005 in.
piston ring (new).
(4.033 0.013 mm)
Thickness of piston ring
0.1567 0.0004 in.
(new).
(3.98 0.01 mm)
Clearance between groove
0.0020 0.0010 in.
and piston ring (new).
(0.0508 0.0254 mm)
Maximum permissible
0.006 in. (0.152 mm)
clearance (worn).
0.0245 0.0075 in.
0.0245 0.075 in.
0.225 0.0075 in.
Clearance between ends of
(0.6223 0.1905 mm)
(0.06223 0.1905 mm)
(5.715 0.1905 mm)
piston ring when installed in
a cylinder liner with a bore
size of 4.7500 in. (120.65
mm).
0.003 in. (0.0762 mm)
0.003 in. (0.0762 mm)
0.003 in. (0.0762 mm)
Increase in clearance
between ends of piston ring
for each 0.001 in. (0.0254
mm) increase in cylinder
bore size.
3.
Install connecting rod (12) in position in the piston (9)
12
6
with bearing tab groove and number identification on
the same side as the "V" mark on the top of the piston.
7
4.
Install piston pin (11) and new retaining rings (10) in
piston (9).
NOTE
8
The oil ring must be installed on the pis-
9
ton with the ring end gaps 180 degrees
apart.
10
5.
Install new piston ring (8) on the piston (9).
6.
Install new intermediate piston ring (7) with the side
11
421-0099
that has the mark "UP-2" toward the top of the piston
(9).
7.
Install new top piston ring (6) with the side that has
the mark "UP-1" toward the top of the piston (9).
Ensure piston ring end gaps are 90 degrees apart
before the pistons are installed.
Change 1
0245 04-8

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