TM 5-6115-400-35
Table 1. Engine Repair and Replacement Standards-Continued
Manufacturer'
s
Maximum
Component
dimensions and
Desired
allowable
tolerance in
clearance
wear and
inches
clearance
Min.
Max.
Min.
Max.
Gap between ends
Top-compression ..........................................................
------------
------------
0.0210
0.0390
2nd-compression ..........................................................
------------
------------
0.0230
0.0410
3rd-compression ...........................................................
------------
------------
0.0230
0.0410
4th-oil control-ventilated w/spring ..................................
------------
------------
0.0130
0.0380
Clearance of rings in grooves
Top-compression ..........................................................
------------
------------
0.0040
0.0060
2nd-compression ..........................................................
------------
------------
0.0030
0.0050
3rd-compression ...........................................................
------------
------------
0.0030
0.0050
4th-oil control-ventilated w/spring ..................................
------------
------------
0.0015
0.0035
Crankshaft:
Journal diameter for connecting rods ............................
3.3725
3.3735
Journal diameter for main bearings ...............................
3.9950
3.9960
Width between connecting rod journal checks ..............
2.1235
2.1265
Width of main bearing journals
Front .........................................................................
2.9080
2.9680
Intermediate ..............................................................
2.0570
2.0670
Center .......................................................................
3.2500
3.2520
Rear ..........................................................................
2.5570
2.5670
Separate type thrust flanges-Available in
standard size and .005 in, .010 in., .015 in. oversize
Crankshaft end clearance .................................................
------------
------------
0.0070
0.0150
Crankshaft journals may be ground - .010 in.,
.020 in., .030 in., .040 in.
Fit of crankshaft front gear on crankshaft ..........................
------------
------------
0.0005
0.0025
...................................................................................
tight
Main bearings:
Number used-7
Type-Aluminum, steel backed
Main bearing-to-crankshaft clearance ......................... -
------------
------------
0.0021
0.0048
Inside diameter of bearings (bearings installed and
caps tightened to specified torque) ...............................
3.9981
3.9998
Diameter of crankshaft main bearing journals ...............
3.9950
3.9960
Length of front and rear bearings ..................................
1.9950
2.0050
Length of center bearing ...............................................
2.7460
2.7560
Length of intermediate bearing ......................................
1.4950
1.5050
Undersize bearings available for service-.010 in.,
.020 in., .030 in., .040 in.
Separate type thrust flanges-Available in
standard size and .005 in., .010 in., .015 in.
oversize
Standard wall thickness ...............................................
0.1876
0.1881
Torque for tightening main bearing capscrews
5/8 in.-U.N.C.
160-170 ft-lb
7/8 in.-U.N.C.
370-380 ft-lb
Connecting rod bearings
Type
Aluminum, steel backed
Inside diameter ..........................................................
3.3756
3.3771
Diameter of crankshaft connecting rod journal .........
3.3725
3.3735
Connecting rod bearing to crankshaft journal
vertical clearance (bearings installed and caps
tightened to specified torque) ....................................
------------
------------
0.0021
------------
0.0046
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