TM 5-1940-322-24
0152 00
PISTON AND CONNECTING ROD MAINTENANCE (Contd)
ASSEMBLY
CAUTION
Ensure FRONT marking on the piston and the numbers on the rod
and cap are oriented. Failure to comply may result in damage to
equipment.
1.
Install retaining ring (6) into pin groove (13) on FRONT side of piston (1).
2.
Lubricate piston pin (5) and cylinder bore (17) with engine oil.
NOTE
The piston does not require heating to install piston pin; however,
the piston must be at room temperature or above.
3.
Install piston pin (5) through piston (1), bushing (7), and connecting rod (8).
4.
Install remaining retaining ring (6) into pin groove (13).
5.
Install rings (4), (3), and (2) in cylinder bore (17) and use a piston to square with cylinder bore (17) at
a depth of 3.5 in. (8.89 cm).
6.
Using feeler gauge, measure piston ring gaps. For measurements, refer to table 2, Piston Ring Gaps.
7.
Remove rings (2), (3), and (4) from cylinder bore (17).
Table 2. Piston Ring Gaps.
ITEM NO.
PISTON RING
MIN
MAX
4
Oil Ring
0.0100 in. (0.250 mm)
0.0215 in. (0.550 mm)
3
Intermediate Ring
0.0100 in. (0.250 mm)
0.0215 in. (0.550 mm)
2
Top Ring
0.0160 in. (0.400 mm)
0.0275 in. (0.700 mm)
CAUTION
The top surfaces of all rings are identified with TOP or a suppliers
MARK. Assemble rings with TOP or MARK facing up. Failure to
comply may result in damage to equipment.
8.
Apply coat of engine oil to rings (2), (3), and (4).
9.
Using piston ring expander tool, install oil ring (4) with end gap 180 from ends of piston ring
expander tool.
10.
Using piston ring expander tool, install intermediate ring (3) with end gap 120 from gap of oil
ring (4).
11.
Using piston ring expander tool, install top ring (2) with end gap 120 from gap of intermediate
ring (3).
12.
Using piston ring compressor, compress rings (2), (3), and (4).
13.
Remove plug (15) from flywheel housing (14).
14.
Using gear barring tool, bar crankshaft to Bottom Dead Center (BDC) position.
15.
Install plug (15) on flywheel housing (14).
16.
Apply coat of lubriplate to bearings (11) and (12).
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