CHAPTER 4
REPAIR AND OVERHAUL INSTRUCTIONS
Section I. OVERHAUL AND REPLACEMENT STANDARDS
120. General
The following tables provide overhaul and replacement standards far the water distributor engine and
pump, defining maximum and minimum installation clearances, tolerances, wear limits, and nut and bolt torque
data.
121. Description
The power pumping unit is comprised of a four cylinder air cooled gasoline engine and a self-priming
centrifugal pump mounted on the engine crankcase.
Table 2. Engine Repair and Replacement Standards
Manufacturer's
Maximum
Dimensions
Desired
Allowable
and tolerance
Clearance
Wear and
in inches
Clearance
Minimum
Maximum
Minimum Maximum
Camshaft:
Diameter of Journals:
No. 1 Journal..................................................................................
1.8725 1.8730
.........................................
0.0035
No. 2 Journal..................................................................................
1.2475 1.2480
.........................................
0.0035
Camshaft Bores in Crankcase:
Nominal dimension of inside diameter:
No. 1 Journal..................................................................................
1.875
1.876
.........................................
0.0035
No. 2 Journal..................................................................................
1.250
1.251
.........................................
0.0035
Clearance between camshaft journal
and crankcase bore.................................................................................................................. 0.002
0.0035
Connecting Rod:
ID of Crankshaft End .....................................................................
1.9370 1.9375
ID of Installed Bushing (crankshaft end)........................................
1.8115 1.8125
Clearance between bushing and crankshaft..........................................................................
0.0019
0.0025
0.003
Side clearance between bushing and
crankshaft ................................................................................................................................ 0.004
0.011
0.016
Maximum out of round of bushing
(crankshaft end).................................................................................................................................................................
0.0005
ID of Piston End.............................................................................
0.9125 0.9130
ID of Installed Bushing (Piston End)..............................................
0.8594 0.8597
.........................................
0.001
Interference OD of bushing to ID of rod................................................................................... 0.0025
0.0055
Clearance between piston pin and bushing............................................................................. 0.0005
.
0.001
0.001
Allowable twist of connecting rod
measured 3 inches from end............................................................................... 0.002
Crankshaft:
Nominal dimension of main bearing:
Journal diameters ....................................................................
1.8100 1.8105
.........................................
0.002
End Play of Crankshaft Bearing.......................................................................................
0.002
0.004
Adjustable
Cylinders:
Nominal dimension of bore diameter..............................................
3.254
3.255
.........................................
0.005
AGO 6571A
69
