TM 9-2320-260-34-1
11-5. AIR COMPRESSOR REPAIR (Contd)
c. Inspection and Repair
1.
Inspect narrow part of unloader cap (1) for scoring and excessive wear. Inspect unloader cap (1)
seating surface for distortion, pitting, and excessive wear. Replace unloaded cap (1) if scored,
distorted, pitted, or excessively worn.
Inspect unloader valve spring (2) for wear. Measure unloader valve spring (2). Refer to table 11-3,
2.
Air Compressor Spring Wear Limits, for measurements. Replace unloader valve spring (2) if worn
past limits.
Inspect intake valve spring (3) for wear. Measure intake valve spring (3). Refer to table 11-3,
3.
Air Compressor Spring Wear Limits, for measurements. Replace intake valve spring (3) if worn
past limits.
4.
Inspect cylinder head cover (4) and cylinder head (6) for cracks, breaks, and bends. Replace cylinder
head cover (4) and/or cylinder head (6) if cracked, broken, or bent.
5.
height. Refer to table 11-2, Air Compressor Wear Limits, for measurements. Replace exhaust valve
seat (5) if bent, cracked, broken, or worn past limits.
Inspect exhaust valve spring (7) for wear. Measure exhaust valve spring (7). Refer to table 11-3,
6.
Air Compressor Spring Wear Limits, for measurements. Replace exhaust valve spring (7) if worn
past limits.
Inspect intake valve seat (8) for bends, cracks, breaks, and wear. Measure intake valve seat (8)
7.
height and surface. Refer to table 11-2, Air Compressor Wear Limits, for measurements. Replace
intake valve seat (8) if bent, cracked, broken, or worn past limits.
Inspect crankshaft (12) for scratches, scoring, and excessive wear. Replace crankshaft (12) if
8.
scratched, scored, or excessively worn.
Inspect crankshaft journals (9), (10), and (11) for wear. Measure crankshaft journals (9), (10),
9.
and (11). Refer to table 11-2, Air Compressor Wear Limits, for measurements. Replace crank-
shaft (12) if any journal (9), (10), or (11) is worn past limits.
WEAR LIMITS/TOLERANCES
ITEM
ITEM/POINT Of MEASUREMENT
NO.
INCHES
MILLIMETERS
12.32
0.485
Exhaust valve seat height - minimum
5
Intake valve seat
8
0.270
6.86
Height - minimum
0.001
0.03
Surface
1.871
47.52
9
Crankshaft journal - minimum
1.871
47.52
10
Crankshaft journal minimum
1.933
49.10
11
Crankshaft journal - minimum
WEAR LIMITS/TOLERANCES
ITEM
ITEM/POINT Of MEASUREMENT
NO.
INCHES
MILLIMETERS
12.00
304.8
2
Unloader valve spring - minimum
0.55
14.0
3
Intake valve spring-minimum
203.2
Exhaust valve spring - minimum
8.00
6
11-16
