INSPECT REBUILT WATER PUMPS

COOLING STSTEM

TESTING AND ADJUSTING

4. Keep the temperature of the water at 1970 F (92 C)

Unless the same impeller or one like it is used and

for ten minutes. Make the water move around. This

positioned on the shaft correctly, it is possible for a rebuilt

keeps all of the water at the same temperature.

water pump not to give enough flow of coolant to cool the

engine. If the one who rebuilt the water pump used an

5. After ten minutes, remove the regulator and

impeller with a design different from the original

immediately measure the distance the regulator is

equipment water pump, be sure the output of his rebuilt

opened. The distance must be a mini- mum of .380

water pump is as good as the original equipment water

in. (9.65 mm).

pump.

Here is how to check a rebuilt water pump:

FAN BELT ADJUSTMENT

1. Bearing end clearance must be .001 to .025 in. (0.03

Make an adjustment to the belt farthest from the

to 0.64 mm).

engine. Correct belt adjustment must give the following

reading using a Burroughs Gauge No, BT-33-96-4-15 or a

2. The clearance (2) between the face of the impeller

similar gauge:

and the front cover is .011 to .035 in. (0.28 to 0.89

mm).

New belt ............ ... 120 5 Gauge reading.

Belt with a minimum of 30 minutes

of operation time .....

90 10 Gauge reading.

WATER PUMP PRESSURE CHECK

Tools Needed:

9S8138 Pressure Gauge.

3B7722 Bushing.

The pressure at the outlet for the water pump tells if

the shunt system and water pump are operating correctly.

To check the pump pressure, install pressure gauge (2) in

the front cover. The pressure must be a minimum of 15

psi (1.05 kg/cm2 ) at 2800 rpm.

IMPELLER CLEARANCE AND HEIGHT

1. Front cover, 2. Impeller clearance [.011 to .035 In,

(0.28 to 0,B mm)]. 3, Impeller. 4, Impeller height [1.286

to 1,275 in. (32,12 to 32.39 mm)].

GAUGE INSTALLED

(Typical Example)

Clearance (2) is an indication of the condition of the

1, 3B7722 Bushing. 2.9S8138 Pressure Gauge.

impeller and of the location of the impeller on the shaft. It

can also be an indication of the condition of the bearing

If the pump pressure is less than the minimum

and front cover. Check the clearance of the impeller in

pressure: First, check the vent tube between the radiator

the following way.

top tank and the surge tank; it must have an inside

diameter of approximately .19 in. (4.8 mm).

a. Put a small amount of wax or a soft material on

two vanes of the impeller directly opposite of

Second, check to see that the shunt line has a

each other.

minimum inside diameter of .75 in. (19.1 mm).

b. Using a new gasket, install the water purity and

INSPECT REBUILT WATER PUMPS

tighten the bolts holding the water pump. DO

NOT turn the pulley.

The water pump is serviced only as a complete unit

and separate parts for the water pump are not available.

Push in on the pulley with a force of about 15 lbs.

Some others can be reconditioning these water pumps,

(7 kg). This will remove the end clearance.

using a different impeller, or an impeller they have

machined on the face for the seal or on the vanes.