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TM 10-3930-669-34
Table 3-1. Wear Limits, Fits, and Tolerances
Component
Minimum
Maximum
Piston Rings - continued:
4th ring clearance in groove
0.0015 in
0.0028 in.
(0.0400 mm)
(0.0720 mm)
4th ring maximum clearance in groove
0.0059 in.
(0.15 mm)
Gap: 1st ring - normal
0.0137 in
0.0216 in.
(0.3500 mm)
(0.5500 mm)
Gap: 2nd ring - normal
0.0079 in
0.0177 in.
(0.2000 mm)
(0.4500 mm)
Gap: 3rd ring - normal
0.0098 in
0.0197 in.
(0.2500 mm)
(0.5000 mm)
Gap: 4th ring - normal
0.0098 in
0.0157 in.
(0.2500 mm)
(0.4000 mm)
Gap: 1st, 2nd, 3rd, and 4th rings - maximum
0.0315 in.
(0.8000 mm)
Connecting Rods:
Hole for connecting rod pin bushing
1.4961 in
1.4966 in.
(38.0000 mm)
(38.0160 mm)
Rod bearing bore diameter, less bearing
2.5196 in
2.5204 in.
(64.0000 mm)
(64.0190 mm)
Rod bearing inside diameter
2.3622 in
2.3637 in.
(60.0000 mm)
(60.0390 mm)
Rod pin bushing outside diameter
1.4980 in
1.4992 in.
(38.0500 mm)
(38.0800 mm)
Rod pin bushing inside diameter - pressed in
1.3795 in
1.3813 in.
(35.0400 mm)
(35.0860 mm)
Rod pin-to-bushing clearance
0.0015 in
0.0035 in.
(0.0400 mm)
(0.0910 mm)
Rod pin-to-bushing maximum clearance
0.0059 in.
(0.1500 mm)
Rod bearing width
0.9763 in
0.9842 in.
(24.8000 mm)
(25.0000 mm)
3-5
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