Install the large retaining ring (4) with the chamfered side facing away from the ball bearing (9).
Apply a thin coat of pipe joint sealing compound such as TT-S-1 732 in the brass case on the water pump seal
(6). Support the water pump on the drive end of the water pump body (13), not on the shaft, and press the water
pump seal (6) into the body until it seats by using special mandrel 3375256.
Use special mandrel 3375256 and press a new water pump seal and seat (5) into place on the shaft The mandrel
3375256 is designed to position the seal and seat to an exact location against the water pump seal (6).
Excessive quantities of sealant will run off and enter the seal face, resulting in seal failure.
Following the installation of the water pump seal and seat (5), a small quantity (1 drop) of adhesive sealant MIL-
S-46163, Type 3, Grade R, (wicking type) must be applied to the joint between the seat and shaft. The sealant
must be allowed to cure for at least 30 minutes before the pump is placed in operation.
Apply a thin coat of bearing retaining compound such as MIL-R46082, Type 1, to the water pump impeller (3)
bore. Supporting the drive end of the shaft (12), align the slot in the impeller to the slot in the shaft and press the
impeller on flush with end of the shaft.
Install the pump drive key (2), into the machined slot on the water pump shaft (12). Install the capscrew (1) and
tighten to 12 to 15 pound-feet (16 to 20 newton-meters).
7-5. WATER PUMP DRIVE REPAIR.
Remove the water pump in accordance with the Operator and Organizational Maintenance Manual.
Remove the splined coupling (14, Figure 7-1) from the shaft (25). Remove the snap wire (15) from the
splined coupling only if it is damaged.
Remove the capscrews (16 and 17), Iockwashers (18), and remove the drive unit items 20 through 29).
Remove and discard the gasket (19).
Remove the retaining ring (20, Figure 7-1), damping washer (21) and thrust bearing (22) from the shaft
(25). Discard the retaining ring.
Remove the gear (23) and shaft (25) from the support (29) as a unit, and remove the thrust washer (24).
Do not remove the gear from the shaft at this time.
Remove the expansion plug (26) and pipe plug (27) from the support (29). Do not remove the bushings
(28) from the support at this time.
Dry cleaning solvent PD-680, Type III, 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. Clean all parts in cleaning solvent PD-680, Type ll, or equivalent, and blow dry with compressed air.