2. PUMP DRIVE KEY
3. WATER PUMP IMPELLER
4. RETAINING RING
5. WATER PUMP SEAL AND SEAT
20. RETAINING RING
6. WATER PUMP SEAL
21. CLAMPING WASHER
7. OIL SEAL
22. THRUST BEARING
8. RETAINING RING
9. BALL BEARING
24. THRUST BEARING
10. BALL BEARING
11. BEARING SPACER
26. EXPANSION PLUG
12. WATER PUMP SHAFT
27. PIPE PLUG
13. WATER PUMP BODY
15. SNAP WIRE
30. DRAIN COCK
Figure 7-1. Water Pump and Water Pump Drive, Exploded View (Sheet 2 of 2)
Inspect the water pump shaft (12) for straightness and galling on the press-fit diameter surfaces. Replace if
Inspect the bearing spacer (11) for cracks.
Dry cleaning solvent PD-680, Type IIl, or equivalent, is flammable and moderately toxic to the
skin, eyes, and respiratory tract. Assure adequate ventilation. Skin, eye, and respiratory
protection is required to avoid injury to personnel.
Compressed air used for cleaning or drying can create airborne particles that may enter the
eyes. Pressure shall not exceed 30 psi (207 kPa). Wearing of goggles is required to avoid
injury to personnel.
Clean all parts in cleaning solvent PD-680, Type Ill, or equivalent, and dry with moisture-free compressed air.
Discard all parts that do not meet the inspection criteria.
7-4. WATER PUMP ASSEMBLY. See Figure 7-1.
Lubricate the water pump shaft (12) bearing surfaces with a thin coat of dean lubricating oil MIL-L-9000 and
install the bearing spacer (11). Use a ST658 mandrel to support the inner ball bearing (10); press the impeller
end of the shaft through the bearing until the shaft shoulder seats on the bearing inner race. Install the retaining
ring (8) on the water pump shaft (12).
Support the outer ball bearing (9) on special mandrel 3375318 and press the drive end of the shaft through the
bearing until the shaft shoulder seats on the bearing inner race.
Care must be taken not to damage the oil seal.
Support the water pump body (13) on the inlet end. Use the 3375319 seal driver with lip of the seat toward the
driver face and press the oil seal (7) into the body until it is flush to 0.030 inch (0.76 mm) below the seal bore.
Apply a thin coat of bearing retaining compound such as MIL-R46082. Type 1, to the ball bearings (9 and 10)
outer race only. Lubricate the shaft seal mating surface, option the bearing and shaft assembly into the water
pump bore and press into the body until the outer ball bearing (9) seats. Use special mandrel 3375318 to support
the bearing outer race.