DETROIT DIESEL 53
5.1
WATER PUMP
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
bearing.
The sealed water pump shaft ball bearing is filled with lubricant
when assembled. No further lubrication is required
Remove Water Pump
Fig. 2 - Typical Water Pump Mounting
1. Remove the radiator cap, open the block and radiator drain
cocks, and drain the cooling system.
NOTE: An idler pulley is used on some engines
2. Loosen and remove the water pump belts.
to adjust the water pump drive belt tension.
3. Loosen the hose clamps and slide the hose up on the water by-pass tube.
4. Remove the five bolts securing the water pump to the oil cooler housing and take off the pump.
Disassemble 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 358-1.
5. Remove the seal assembly from the pump shaft and
discard it.
Fig. 1 - Water Pump Assembly
October, 1970
SEC. 5.1 Page 1
