TM 9-2320-272-24-3
4-52. AIR COMPRESSOR MAINTENANCE (Contd)
b. Cleaning and Inspection
1.
For general cleaning instructions, refer to para. 2-14.
2.
For general inspection instructions, refer to para. 2-15.
3.
Inspect compressor head (2) and compressor head cover (1) for cracks and breaks. If cracked or
broken, replace compressor head (2) or compressor head cover (1).
4.
Inspect crankshaft (6) for scratches, scoring, and wear. Refer to table 4-6, Air Compressor Wear
Limits, for measurements. If damaged or worn, replace crankshaft (5).
Inspect bore (4) of support (3) for scratches, scoring, and wear. Refer to table 4-6, Air Compressor
5.
Wear Limits, for measurements. If damaged or won, replace support (3).
Inspect thickness of thrust washer (10) for wear. Refer to table 4-6, Air compressor Wear Limits, for
6.
measurements. If damaged or worn, replace thrust washer (10).
Inspect connecting rod (6), for breaks, bends, twists, scoring, and wear. If bent, broken, twisted,
7.
scored, or worn, replace connecting rod (6).
Measure inside diameter of piston pin bore (7) and crankshaft journal (8). Refer to table 4-6, Air
8.
Compressor Wear Limits, for measurements. If damaged or worn, replace connecting rod (6).
Measure outside diameter of piston pin (9). Refer to table 4-6, Air Compressor Wear Limits, for
9.
measurements. If damaged or worn, replace piston pin (9).
Inspect piston (11) for breaks, cracks, scoring, and wear. If broken, cracked, scored, or worn, replace
10.
piston (11).
Measure outside diameter of piston skirt (12). Refer to table 4-6, Air Compressor Wear Limits, for
11.
measurements. If damaged or worn, replace piston (11).
Measure inside diameter of piston pin bore (13). Refer to table 4-6, Air Compressor Wear Limits. for
12.
measurements. If damaged or worn, replace piston (11).
Table 4-6. Air Compressor Wear Limits.
WEAR LIMITS/TOLERANCES
ITEM/POINT OF MEASUREMENT
ITEM NO.
INCHES
MILLIMETERS
1.877
47.68
4
Support bore/inside diameter
1.877
47.68
5
Crankshaft/outside diameter A
1.933
49.10
outside diameter B
1.871
47.52
outside diameter C
0.689
17.50
7
Piston pin bore/inside diameter
1.935
49.15
8
Crankshaft journal bore/inside diameter
0.687
17.45
9
Piston pin/outside diameter
0.240
6.10
10
Thrust washer thickness
3.617
91.87
12
Piston skirt/outside diameter
0.689
17.50
13
Piston pin bore/inside diameter
4-318
