DETROIT DIESEL 53
WATER P U M P
A centrifugal-type water pump (Fig. 1) is mounted on
top of the engine oil cooler housing as shown in
Fig. 2. It circulates the coolant through the oil cooler,
cylinder block, cylinder head(s) and radiator.
The pump is belt driven by either the camshaft or
balance shaft (In-line engines).
An impeller is pressed onto one end of the water
pump shaft, and a water pump drive pulley is pressed
onto the opposite end. The pump shaft is supported on
a sealed double-row combination radial and thrust ball
bearing. Coolant is prevented from creeping along the
shaft toward the bearing by a seal. The shaft and
bearing constitute an assembly, and are serviced as
such, since the shaft serves as the inner race of the ball
The sealed water pump shaft ball bearing is filled with
lubricant when assembled. No further lubrication is
Fig. 2 - Typical Water Pump Mounting
NOTE: An idler pulley is used on some engines
to adjust the water pump drive belt tension.
Remove Water Pump
1. Remove the radiator cap, open the block and
3. Loosen the hose clamps and slide the hose up on the
radiator drain cocks, and drain the cooling system.
water by-pass tube.
2. Loosen and remove the water pump belts.
4. Remove the five bolts securing the water pump to
the oil cooler housing and take off the pump.
1. Note the position of the pulley on the shaft so that
the pulley can be reinstalled in the same position when
the pump is reassembled. Remove the water pump
pulley as shown in Fig. 3.
2. Remove the pump cover and discard the gasket.
3. Press the shaft and bearing assembly, seal, and
impeller out of the pump body as an assembly. by
applying pressure on the bearing outer race with
remover J 1930.
CAUTION: The bearing will be damaged if the
pump is disassembled by pressing on the end of
the pump shaft.
4. Press the end of the shaft out of the impeller as
shown in Fig. 4, using plates J 8329 and holder J 358
5. Remove the seal assembly from the pump shaft and
Fig. 1 - Water Pump Assembly
October, 1970 SEC. 5.1 Page 1