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Page Title:
Table 4-1. Engine Fits, Tolerances, and Wear Limits |
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 TM 5-4320-258-34
Table 4-1. Engine Fits, Tolerances, and Wear Limits
Manufacturer's
dimensions
Design
clearances
Allowable
Component points of measurement
and tolerances
in inches
in
inches
wear or
Minimum
Maximum,
Minimum
Maximum
clearance
Valve and valve guides
Intake valves
Cylinder block face-to-guide distance
115/32
Outside diameter
0.6565
0.6575
Inside diameter
0.3422
0.3432
0.3447
Valve stem diameter
0.3406
0.3414
0.3386
Stem-to-guide clearance
0.0008
0.0026
0.0046
Valve tappet clearance
0.0140
Exhaust valves
Cylinder block face-to-guide distance
115/32
Outside diameter
0.6565
0.6575
Inside diameter
0.3422
0.3432
0.3447
Valve stem diameter
0.3377
0.3385
0.3357
Stem-to-guide clearance
0.0037
0.0055
0.0075
Valve tappet clearance
0.0160 (Hot)
0.0170 (Cold}
Valve tappets
Outside diameter
0.9990
Tappet bore diameter
1.0000
Maximum bore-to-tappet clearance
0.0050
Camshaft and bushings
Bearing journal diameter
No. 1
1.8715
1.8725
1.8705
No. 2
1.8085
1.8095
1.8075
No. 3
1.7457
1.7465
1.7447
No. 4
1.2465
1.2475
1.2455
Camshaft bushing diameter
No. 1
1.8745
1.8755
No. 2
1.8115
1.8125
No. 3
1.7495
1.7502
No. 4
1.2495
1.2505
Journal-to-bushing clearance
No. 1
0.0020
0.0040
No. 2
0.0020
0.0040
No. 3
0.0020
0.0040
No. 4
0.0020
0.0040
Camshaft end play
0.0050
0.0090
Connecting rod
Bushing hole diameter
0.9130
0.9140
Bearing hole diameter
2.1865
2.1870
Side play
0/0060
0.0100
Connecting rod bearing
Bearing hole diameter
2.1865
2.1870
Bearing thickness
0.0613
0.0616
0.0608
Crankpin diameter
2.0619
2.0627
2.0609
Bearing to crankshaft clearance
0.0032
Crankshaft
End thrust
0.0030
0.0080
Main bearing journal diameter
2.3744
2.3752
2.3734
Crankpin diameter
2.0619
2.0627
2.0609
Main bearings
Case hole
2.5615
2.5622
Bearing thickness
0.0925
0.0928
0.0920
Crankshaft journal diameter
2.3744
2.3752
2.3734
Journal-to-bearing clearance
0.0007
0.0028
Piston
Ring groove width
1st
0.1270
0.1290
0.1305
2nd and 3rd
0.1275
0.1285
0.1305
4th
0.2520
0.2530
0.2550
Cylinder bore diameter
3.4375
3.4395
3.4475
Piston fit in bore. Check by pull on 1/ 3-inch
5-10 lb
wide-0.003-inch feeler gage
4-2
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