WATER PUMP REMOVAL - TM-10-3930-644-14-P0276

TM 10-3930-644-14&P

Purge the cooling system from all rust and scale by

running the engine with a cleaning or flushing solution

added to the coolant. The flushing solution is then

drained through the radiator drain cock and the block

drain cock located underneath the alternator. After

draining. it is advisable to reverse flush the radiator first.

CAUTION

Allow engine to cool before reverse

flushing the radiator. Refer to Topic

3 Radiator.

C. WATER PUMP REMOVAL

Proceed as follows:

1. Remove the engine side panels and raise the

operator's seat.

2. Loosen the alternator adjusting bracket

capscrew and the alternator pivot mounting

capscrew and push the alternator towards the

engine until the fan belt tension is relieved.

Figure 2-2. Measuring Distance Between Pump Body

Remove the fan belt.

and Rear of Pulley Flange.

3. Remove the fan blade mounting capscrews and

2. Use a puller to remove pulley from shaft, see

lockwashers then remove the fan.

Figure 2-3.

4. Remove the radiator pressure cap, open the

3. Remove the impeller using a puller.

Take

drain rocks located beneath radiator and the

alternator, and drain the cooling system.

precautions to prevent damage to the pump

body.

5. Loosen the hose clamp and remove the bottom

hose leading from radiator.

4. Remove the impeller seal and gasket.

5. Using long-nose pliers, remove the retainer ring

6. Loosen the clamp at each end of the coolant by-

pass hose. and remove the hose.

that holds the bearing and shaft assembly in the

pump body.

7. Remove the capscrews which secure the water

plump to the cylinder block, then remove the

6. Using an arbor press or a lead hammer, force

the bearing and shaft assembly out through the

water pump and the flange gasket.

front.

D. DISASSEMBLY

CAUTION

DO NOT attempt to drive the water

When disassembling the water pump. an arbor press

and suitable pressing blocks are required. Disassembly

pump shaft out through the rear. To

do so, will damage the pump body

must be performed in the following sequence to prevent

beyond repair.

damage to the pump. See Figure 2-1.

E. INSPECTION/REPAIR Repair to the water pump will

1. Remove the back plate from the pump and

consist of replacement of any parts that are worn or

measure the distance from rear of pump body to

rear of pulley flange, see Figure 2-2. This

damaged.

measurement, "A" shown in Figure 2-2, insert, is

1. Clean rust or other deposits from pump parts

used during pump installation.

and inspect for corrosion,

R-155-1

3-106