tributor and remove the four capscrews (10,fig. 31) and starwashers securing the engine supports (8) to the
engine.
supports.
h. Lower the engine and pump assembly to suitable blocking.
123. Installation of the Power Pumping Unit
a. Using a suitable lifting device, lift the power pumping unit from its blocking.
b. Position the two engine supports (8) on the engine and install the four capscrews (10) and lockwashers
(9).
c. Position the wood engine sleepers on the distributor frame.
d. Place the power pumping unit on the engine sleepers and install the four capscrews, tarwashers, and
s
nuts.
e. Install the oil drain nipple and drain plug and fill engine crankcase with oil per LO 5-3825-221-15.
f. Connect the starter cable at the pump engine starter switch terminal and then at the carrier battery
terminal.
g. Connect the fuel line.
Section II. WATER PUMP
124. Description
The water pump is self-priming and contains a certifugal impeller keyed to the engine crankshaft and
retained by a washer and acorn nut on the end of the crankshaft. The pump will prime andreprime once the
pump tank is filled with water. A suction strainer located in the suction line, prevents harmful debris from
harming the impeller.
125. Water Pump Removal
a. Remove the power pumping unit (para.122).
c. Remove impeller nut (17) and washer (18) and remove impeller (20) and woodruff key (19) from
crankshaft.
remove lantern and seal (22) from crankshaft.
e. Remove diffuser (16) and gasket (15) from pump tank (12).
f. Remove four capscrews (1) securing suction inlet and check valve (7) to pump tank.
g. Remove nut (10) from carriage bolt (4) and disassemble check valve.
126. Water Pump Cleaning, Inspection, and Repair
a. Clean all pump parts and engine crankshaft with an approved cleaning solvent.
b. Inspect crankshaft threads and keyway for damage. Repair any nicks at keyway by dressing with a fine
stone.
c. Inspect pump parts for cracks, breaks or other damage. Repair or replace damaged parts.
127. Water Pump Assembly
b. Coat the surfaces of the seal cavity and crankshaft with light cup grease orvaseline and install shaft
seal (22).
c. Install impeller key (19) and impeller (20) and secure with impeller nut (17) washer (18).
d. Assemble check valve (7) and secure with carriage bolt (4) and nut (10).
e. Position check valve (7) and suction inlet (2) on tank (12) and secure with four capscrews (1).
f. Position gasket (15) and diffuser (16) in pump tank (12) being sure diffuser is engaged with alignment
pin.
g. Place gasket (23) on lantern flange, position pump tank (12) on lantern (24) and secure with twelve
capscrews (27).
AGO 6871A
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