Table 2. Engine Repair and Replacement Standards-Continued
Manufacturer's
Maximum
Dimensions
Clearance
Allowable
and tolerance
Desired
Wear and
in inches
Clearance
Minimum
Maximum
Minimum Maximum
Fuel Pump:
Plunger shaft diameter...................................................................
0.3715 0.3720
.....................................
0.002
ID of plunger shaft bore in adapter.................................................
0.373
0.374
.....................................
0.002
Idler Gear:
Diameter of idler gear shaft............................................................
0.7400 0.7495
.....................................
0.002
Diameter of shaft bore in gear........................................................
0.7510 0.7515
.....................................
0.002
Clearance of gear bore to shaft.................................................................................................. 0.001
0.0025
Backlash of idler gear................................................................................................................. 0.002
0.004
Oil Pump:
Drive shaft diameter .......................................................................
0.4995 0.5000
.....................................
0.002
Diameter of shaft bore in pump body.............................................
0.500
0.5015
.....................................
0.002
Clearance, bore-to-shaft............................................................................................................. 0.0005
0.003
Driven gear stud shaft diameter.....................................................
0.4996 0.5000
.....................................
0.002
Diameter of bore in driven gear ......................................................
0.5005 0.5015
.....................................
0.002
Piston:
Allowable wear from diameter of skirt...................................................................................................................................
0.005
Clearance, skirt-to-cylinder bore................................................................................................. 0.004
0.0045
Diameter of piston pin bore............................................................
0.8593 0.8596
Clearance piston pin-to-piston.................................................................................................... 0.0000
0.0005
0.001
Diameter of piston pin ....................................................................
0.8591 0.8593
Piston Ring:
Cap Clearance (fitted in cylinder)............................................................................................... 0.015
Clearance of ring in piston groove:
Groove No. 1........................................................................................................................ 0.002
0.0035
Groove No. 2........................................................................................................................ 0.001
0.0025
0.0055
Groove No. 3........................................................................................................................ 0.0025
0.004
Tappets:
Diameter of guide holes in block....................................................
0.6245 0.6255
.....................................
0.002
Clearance, tappet-to-hole........................................................................................................... 0.0005
0.0025
Diameter to tappet..........................................................................
0.623
0.624
Valves (Intake and Exhaust):
Stem diameter...............................................................................
0.3405 0.3415
.....................................
0.002
Stem-to-guide hole clearance..................................................................................................... 0.003
0.005
0.007
Nominal dimension of valve guide hole...........................................
0.344
0.345
.....................................
0.002
Valve Seat (Insert):
Nominal dimensions of seat diameter ............................................
1.3765 1.3770
Interference OD of insert-to-ID bore........................................................................................... 0.001
0.003
Table 3. Torque data
Connecting rod bolts nuts.........................................................................................................................................................................22-24 ft-lb
.
Crankshaft main bearings plate capscrews..............................................................................................................................................25-30 ft-lb
.
Cylinder-block nuts....................................................................................................................................................................................40-50 ft-lb
Cylinder head capscrews..........................................................................................................................................................................22-24 ft-lb
Gear cover capscrews...............................................................................................................................................................................14-18 ft-lb
Manifold nuts............................................................................................................................................................................................. 14-18 ft-lb
Oil pan (crankcase bottom plate)..................................................................................................................................................................6-9 ft-lb
Spark plugs ............................................................................................................................................................................................... 25-30 ft-lb
122. Removal of Power Pumping Unit
a. Remove water piping from pump (para.115).
b. Disconnect fuel line at flexible line.
d. Disconnect starter cable, first at carrier battery terminal and then at pump engine starter switch
terminal.
e. Remove eight nuts, starwashers and bolts securing power pumping unit to distributor frame.
f. Using a suitable lifting device, lift the engine and pump assembly from the waterdis-
AGO 6871A
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