LEGEND FOR FIGURE 13-28
Section IV. WATER PUMP
REPAIR. There are two types of water pumps
used on the engine assembly, All generator sets after
engine serial number 10605201 are equipped with the
new style pump incorporating an idler assembly. This
section provides disassembly and repair instructions for
both types of water pumps.
Water Pump Without Idler Assembly.
(1) Disassembly. Prior to disassembly, remove
the water pump from the engine assembly
in accordance with the Operator/Crew and
Organizational Maintenance manual. Refer
to figure 13-29.
removing five screws (13), lockwashers
(14), cover (41), and gasket (30).
(b) Pull impeller (29) with puller and pull
sheave hub (19) from pump drive shaft
(25). Remove three screws (16) and
washers (17) to disassemble sheave
(c) Remove snap ring (21) from pulley end
of body (15) and press out shaft spacer
(23) and bearings (22). Remove carbon
face seal (26) and seat (28) from pump
body (15); discard seal and seat.
(d) Press shaft (25) from bearings (22) and
spacer (23); only if damaged, remove
retaining ring (24) from groove in shaft.
(2) Repair. Proceed as follows:
(a) Inspect bearings for rough or worn
races, or damaged shield. Replace if
(b) Inspect impeller and cover for cracks or
circulation. Replace if necessary.
(c) Measure internal clearances and press
fits in accordance with tabulated data in
Chapter 1. Replace parts as necessary.
(d) Inspect water pump mounting parts for
cracks. Replace as necessary.
(3) Reassembly. Reassemble the water pump
(a) Place bearing retaining ring (24) over
long end of water pump drive shaft (25);
press into first ring groove with a piece
of tapered steel tubing.
(b) Pack bearings (22) full of grease, MIL-