Table 1-1. Repair and Replacement Standards-Continued
Manufacturer's
Desired
Maximum
dimensions
clearance
allowable
Component
and tolerance
wear and
in inches
clearance
Minimum
Maximum
Minimum
Maximum
Crankpin bore
2.7725
2.7730
2.7730
Maximum out-of-round
0.0015
Clearance between rod and piston boss
0.040
0.050
Bore misalignment (center to center)
0.040
0.050
Bend
0.000
0.004
0.004
0.001
Twist
0.000
0.010
0.010
0.001
Side clearance on shaft
0.008
0.012
0.016
Piston:
Piston skirt dia. at 70DF
Part No. 112340
4.1195
4.1200
4.1165
Part No. 112350
4.1195
4.1205
4.1165
Part No. 117250
4.1185
4.1195
4.115
Part No. 117380
4.118
4.119
4.115
Piston pin bore (at 70F)
1.4988
1.4990
1.500
Piston pin outside diameter
1.4988
1.4990
1.4978
Ring gap clearance (new liner)
0.013
0.023
Rear cover:
Cover plate to crankshaft clearance
.004
0.006
Bore to crankshaft runout
0.005
Camshaft:
Journal diameter
No. 1
1.747
1.748
1.746
Nos. 2, 3, 4, 5, 6, 7
1.872
1.873
1.871
Gear case cover:
Fuel pump or compressor drive bushing 1.314 1.319 1.321
Counterbalancer:
Weight shaft journals O.D
1.9975
1.9985
1.9960
Pushing I.D. (raised)
2.0015
2.0045
2.0060
Bushing I.D. (pan)
1.2565
1.2580
1.2595
Cylinder head:
Height
5.000
5.010
Minimum permissible height after refacing
4.970
Valve seat insert counter bore standard
depth
0.006/
0.010 inch
deeper than
insert thick-
ness
Standard inside diameter
1.427
1.428
Valve seat insert:
Valve seat angle
30
30
30
Insert outside diameter
1.430
1.431
Thickness
0.157
0.161
Over sizes
0.010,
0.020,
0.030,
0.040
Valve guide inside diameter
0.3425
0.3432
0.345
Intake and exhaust valve:
Seat angle
30
30
30
Stem diameter
0.340
0.341
0.339
Crosshead guide bore (tubular stem)
0.3760
0.3800
0.3780
Crosshead stem diameter (solid stem)
0.3708
0.3713
0.3700
Crosshead guide inside diameter
(tubular type)
0.3755
0.3760
0.3780
Crosshead guide outside diameter
(solid type)
0.3750
0.3755
0.3740
Injector seat angle in sleeve
60
60
60
1-3
