TOPIC 2. WATER PUMP

TM 10-3930-644-14&P

TOPIC 2. WATER PUMP

A. DESCRIPTION

shaft bearing.

The pump shaft and the bearing

constitute one assembly and are serviced as such. The

Liquid coolant is circulated through the engine and the

shaft bearing is the shielded type and is filled with

radiator by a centrifugal water pump. The pump is

lubricant when assembled, therefore no further

enclosed in a sealed, cast metal housing and is flange

lubrication is necessary The construction of the water

mounted to the engine block. The pump impeller is

pump is conducive to long life with minimum attention if

pressed on one end of a steel shaft and the fan drive

clean coolant is used in the system. Water containing

pulley is pressed on the other end. The shaft is

scale forming elements is especially harmful to the pump

supported at the drive end by a sealed, double row ball

parts due to corrosion.

bearing, and is prevented from moving endwise by a

retainer ring and a 'shoulder in the pump housing.

B. SYSTEM REVERSE FLOW FLUSHING

Coolant is prevented from seeping along the shaft at the

When It becomes necessary to remove the water pump

impeller end by a spring-loaded neoprene seal, which is

for service or replacement, the cooling system should be

retained in the pump housing by a bearing against the

thoroughly cleaned first, by flushing the radiator and the

face of the impeller. Any coolant which does seep past

water cooling jacket in the forward and reverse

the impeller is thrown from the shaft by a slinger before

directions.

the coolant can enter the

Figure 2-1. Water Pump, Exploded View

R-155-1

3-105