Water Pump - TM-10-3930-633-120080

TM 10-3930-633-12

4-65. Water Pump

(5) Remove pulley hub (6), using a bearing

puller or an arbor press.

a. General. The centrifugal-type water pump is

(6) Remove pipe plug (4) from housing.

mounted on the front of the cylinder block, and is

(7) Remove shaft and bearing assembly (7)

driven from the crankshaft damper by pulleys and

from the rear of water pump housing, with im-

a V-belt. A vane-type impeller in the water pump

peller (8) still assembled.

supplies coolant, through centrifugal action, to

the water pump outlet port. The water pumps

(8) Using a bearing puller or arbor press,

remove impeller (8) from shaft and bearing

have a double row sealed ball bearing, integral

assembly (7).

with the water pump shaft. The bearing requires

(9) Removal seal (9) from shaft and bearing

no lubrication. A bleed hole in the water pump

assembly (7).

housing allows water that may leak past the seal

e. Replacement.

to be thrown out by the slinger. The cooling fan

hub is pressed a specified distance onto the water

(1) Install seal (9) on shaft and bearing

assembly (7).

pump shaft.

b. Operation. Coolant enters the water pump

(2) Use an arbor press to install impeller (8)

onto shaft and bearing assembly (7).

at its center. Centrifugal force then forces coolant

(3) Install shaft and bearing assembly (7)

radially outward, through vanes of the pump

into rear of water pump housing.

impeller, and backward through the pump outlet

(4) Using an arbor press, install pulley hub

port.

(6) onto shaft extension.

c. Inspection. Check the water pump for leaks,

and excessive end play or looseness of the shaft in

(5) Install pipe plug (4) into housing.

the pump. A quick way to check is to work the fan

(6) Coat a new gasket (5) on both sides with

water-resistant sealer and position it on the

blades up and down by hand. If any play is

cylinder block.

noticed, this indicates that the bearings are

(7) Position the water pump (3) in place and

rough. Rough bearings should be checked to see if

install the lockwashers (2) and retaining bolts (1).

the water pump should be replaced or rebuilt.

(8) Connect the radiator lower hose to the

d. Removal. Refer to figure 4-34 and proceed

water pump.

as follows:

(9) Install the water pump pulley and fan.

(1) Drain the cooling system.

Torque the bolts to 12-15 ft/lb.

(2) Disconnect lower hose from the water

( 1 0 ) Install V-belts and tighten to

pump outlet fitting.

specifications.

(3) Remove fan from fan hub on water pump

(11 ) Connect upper radiator hose to radiator

shaft. Loosen alternator mounting bolts and

and tighten clamps.

remove V-belts.

(12) Refill cooling system.

(4) Remove capscrews (1) and lockwashers

(2) securing pump assembly to cylinder block,

and remove the pump assembly (3) and gasket

(5).

4-52