DETROIT DIESEL 53
A centrifugal-type water pump (Fig. I) 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 one of the camshafts (V-type
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
Fig. 2. - Typical Water Pump Mouring
Remove Water Pump
NOTE: An idler pulley is used on some
1. Remove the radiator cap, open the block and
engines to adjust the water pump drive
radiator drain cocks, and drain the cooling system.
2. Loosen and remove, the water pump belts.
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 tc
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.
Fig. 1. - Water Pump Assembly
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.
The bearing will be
damaged if the pump is disassembled
by pressing on the end of the pump
4. Press the end of the shaft out of the impeller as
shown in Fig. 4, using plates J 8329 and holder J 3581.
5. Remove the seal assembly from the pump shaft and
1970 General Motors Corp.
SEC. 5.1 Page 1