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 TM 55-1905-221-14-1
Table 1-1. Engine Repair and Replacement Standards (American Standard) (Continued).
Manufacturers'
Dimensions and
Desired
Component
Tolerances In Inches
Clearance
Maximum*
Allowable
Wear and
Minimum
Maximum
Minimum
Maximum
Clearances
Inches
Inches
Inches
Inches
In Inches
PISTON AND RINGS
Piston:
Height (centerline of bushing-to-top of piston)
3.5130
3.5180
..........
..........
..........
Diameter:
At top................................ ...........................
4.2190
4.2220
..........
..........
..........
At skirt (below ring grooves to bottom).........
4.2433
4.2455
Clearance-piston skirt-to-liner ......................
..........
..........
0.0040
0.0078
0.0120
Out-of-round ................................ ................
..........
0.0005
..........
..........
..........
Taper ................................ ...........................
..........
0.0005
..........
..........
..........
Compression rings:
Gap................................ .........................
..........
..........
0.0180
0.0430
0.0600
Clearance-ring-to-groove
Top ring................................ ...................
..........
..........
0.0095
0.0130
0.0220
No. 2 ................................ ......................
..........
..........
0.0075
0.0110
0.0150
No. 3 and 4 ................................ ............
..........
..........
0.0055
0.0090
0.0130
Oil control rings:
Gap................................ .........................
..........
..........
0.0080
0.0230
0.0430
Clearance-ring-to-groove.........................
..........
..........
0.0015
0.0055
0.0080
PISTON PINS
Diameter ................................ .........................
1.4996
1.5000
..........
..........
1.4980
Pin-to-piston-clearance ................................ ...
..........
..........
0.0025
0.0034
0.0100
Pin-to-rod-bushing clearance ..........................
..........
..........
0.0015
0.0024
0.0100
Length................................ .............................
3.6050
3.6200
..........
..........
..........
Pin-to-retainer end clearance
(retainer with lock ring)................................ .
..........
..........
0.0160
0.0640
0.0640
1-15
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