TM 5-3820-233-35/2
Table 1. Engine Repair and Replacement Standards-Continued.
Manufacturer's
Maximum
dimensions and
Desired
allowable
tolerances in inches
clearance
wear and
Components
Minimum
Maximum
Minimum
Maximum
clearance
Connecting Rod Bearings:
Inside diameter (vertical axis)
2.7514
2.7534
------
------
------
Clearance-bearing to crankshaft journal
------
------
0.0014
0.0044
0.0060
Bearing thickness-90from parting line
0.1548
0.1553
------
------
0.1530
Cylinder Block:
(min.)
Main bearing bore-inside diameter (vertical
3.812
3.8130
------
------
------
axis)
Block bore:
Diameter
4.6265
4.6275
------
------
------
Out-of-round
------
0.0010
------
------
0.0030
Taper
------
0.0010
------
------
0.0020
Cylinder liner counterbore:
Diameter
5.0460
5.0485
------
------
------
Depth
0.4785
0.4795
------
------
------
Cylinder liners:
Outside diameter
4.6250
4.6260
------
------
------
Inside diameter
4.2495
4.2511
------
------
------
Clearance-liner to block bore
------
------
0.0005
0.0025
0.0030
Out-of-round-liner inside diameter
------
0.0020
------
------
0.0030
Taper-liner inside diameter
------
0.0010
------
------
0.0020
Depth of liner flange BELOW High block
0.0465
0.0500
------
------
0.0500
Height of liner ABOVE low block
0.0020
0.0060
------
------
0.0060
Variation in height between adjacent liners
------
0.0020
------
------
0.0020
Pistons and Rings:
Piston:
Height (centerline of bushing top of piston)
3.5130
3.5180
------
------
------
Diameter:
At top
4.2190
4.2220
------
------
------
At skirt (below (compression ring grooves
4.2433
4.2455
------
------
------
to bottom)
(Clearance-piston skirt to line
------
------
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 bushing 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
------
------
0.0160
0.0640
0.0640
Piston Pin Bushings:
Inside diameter
1.5025
1.5030
------
------
1.5050
Connecting Rod:
Inside diameter upper bushing
1.5015
1.5020
------
------
1.5080
Normal rod side clearance
------
------
0.0060
0.0120
------
1-6
