Section XIII. Water Pump and Fan
Water Pump. The water pump assembly is mounted on oil cooler and is driven by camshaft pulley. It is a
centrifugal type and circulates coolant through cylinder block, cylinder head, radiator heat exchanger and oil cooler. The
drive end of pump shaft is supported by a sealed double-row combination radial and thrust ball bearing. The pump shaft
serves as an inner race for bearing.
Fan Assembly. The fan assembly, used for cooling engine, is driven by belts directly from crankshaft. The fan is
heavy duty five blade type.
5-47 Water pump disassembly
Clean the corrosion from around impeller and shaft before separating shaft and bearing assembly
from impeller, seal and water pump body.
Note position of pulley on shaft so that it can be assembled in same position.
Use a suitable puller and remove pulley.
Refer to Figure 5-22 and remove pump cover and gasket. Discard gasket.
Press shaft and bearing assembly, seal, and impeller out of pump body as an assembly, by applying pressure on
bearing outer race with a remove.
The bearing will be damaged if pump is disassembled by pressing on end of pump shaft.
Press end of shaft out of impeller placing shaft long end down in an arbor press. Use a drift and press shaft out
Remove seal assembly from pump shaft and discard.
5-48 Water pump cleaning, inspection and repair
Cleaning solvents are dangerous and can be toxic. Use only in well-ventilated areas. Observe all
precautions stated on the container, and never put solvents in unmarked containers.