TM 5-3810-294-34
Table 1-4. Repair and Replacement Standards (Continued)
Manufacturing Dimensions
Maximum allowable
and tolerances inches
wear or clearance
Component
From
To
maximum
OIL PUMP (Continued):
Pump shaft diameter ............................................. 0.4905
0.4910
Pump shaft clearance in bore ................................ 0.0015
0.003
Body gear backlash - inch ..................................... 0.003
0.015
Note: Oil pressure is from 15 to 55 (Engine at low
idle and above 1500, respectively).
FLYWHEEL HOUSING
SAE No 2 Flange
When assembled o n the engine, the large bore of the
housing is to be concentric with the crankshaft within
.008 inch total indicator .... reading The rear face of the
housing is to be square with the . crankshaft within .008
inch total indicator reading.
SPARK PLUG:
Gap, inch
....................................................... 0.028
0.033
Thread size
....................................................... 14MM
Hex size
....................................................... 13/16
CARBURETOR:
Power jet size tube assembly ................................
No. 28 (1.028)
Power valve channel restriction..............................
No. 54 drill(0.555)
High speed bleed - inch..........................................
Pri. No 68 drill (0.031)
.......................................................
Sec,No. 66 drill (0.033)
Asperating hole - inch.............................................
0.055 inverted
Idle tubes
.......................................................
84 cc per min
Idle channel restriction - inch..................................
No. 54 drill (0.055)
Idle discharge hole - inch .......................................
No. 55 drill (0.052)
Idle transfer hole - inch...........................................
No. 58 drill (0.042)
Idle air bleed - inch .................................................
No. 51 drill (0.067)
Main well tube - inch...............................................
1/8 dia.
Main well bleed.......................................................
No. 68 drill (0.031)
Fuel inlet needle seat .............................................
0.110
Accelerator pump discharge hole...........................
No 69 drill (0.0293)
Accelerator pump spring ........................................
0.035 wire 3/4 OD
.......................................................
by 2 7/8 long
Manifold drilling ...................................................... 0.070
Vertical drilling ....................................................... 0.046
Venturi drilling ....................................................... 0.039
Venturi bleed - inch ................................................ 0.029
Governor spring color marking
Yellow
Governor spring position in housing
No. 1 post
Governor by-pass jet (top) - inch............................ 0.031
Governor by-pass jet (bottom) - inch...................... 0.042
AIR COMPRESSOR:
Unloading valve stem diameter ..............................
0.002
Discharge valve groove .........................................
0.003
Crankshaft bearing fit in body................................. 0.003T
0.005T
Cylinder bore:
Out of round .................................................. 0.003
0.003
Taper
....................................................... 0.003
0.003
Clearance in cylinder bore ............................. 0.002
0.004
Piston rings:
Fit in grooves
Compression.................................. 0.002
0.004
Oil scraper ..................................... 0.0035
0.0055
End gap ................................................. 0.020
0.020
Clearance at gap in cylinder .................. 0.010
0.015
Piston pins:
Fit in piston..................................................... 0.0003T
0.0005T
Clearance in connecting rod bushing............. 0.0005
0.001
1-10
