Raw Water Pumps - Westerbeke 11.5KW-60Hz Service Manual

RAW WATER PUMP
(PN.33636)
Disassembly
The pump, as removed from the engine, will have hose
attachment nipples threaded into its inlet and outlet ports.
They may be left in place or removed if they interfere with
the pump disassembly. Note the port location and positioning
if removed.
1. Remove the six cover plate screws, cover plate, and the
cover plate gasket.
NOTE:
Replacement of the cover plate gasket is recom-
mended; however,
if
you are going to reuse it, keep the
gasket submerged in water until the pump is reassembled.
If
it's allowed to dry, the gasket will shrink and not be
reusable.
2. Remove the impeller with its drive screw from the pump
housing. ' .
3. Remove the screw and sealing washer and remove the
cam from the pump housing.
4. Remove the retaining ring.
s.
Support the pump housing, at the mounting flange end,
on an arbor press, and with a drift, press out the shaft and
bearings from the pump houSing.
6. With the pump housing supported, push
th~
seals.O}lt of
the pump housing. Push the impeller side seal out the
impeller side, then lift the spacer out. Then push the. .'
bearing side seal out the bearing side.
7. Supporting the bearing's inner race, push the shaft out of
the bearings.
. Inspection
, Inspect all parts and replace those showing wear or corrosion.
Reassembly
2. Install the shaft into the bearings. Support the bearings at
their center races. Push the shaft into the bearings, push-
ing at the impeller drive slot end using the base of the
drive slot. Push the shaft through both of the bearings,
flush against each other so the flat-sided end of the shaft
extends beyond the second bearing center race 19/32 in
(15
mm) ±
1/32
in (.5 mmJ.
3. Support the pump housing at the impeller side.
Apply a small amount of petroleum jelly to the seal's
inner lips and to the impeller shaft. Carefully install the
shaft, rotating it through the seals until the bearings
contact the housing from the bearing end. Use a pushing
tool- that will push t1tis shaft and the bearing assembly
into the pump housing by applying pressure against the
outer bearing race. Push the assembly into the housing
until the bearings seat fully in the housing. Install the
retaining ring.
4. Position the cam in the housing and secure it in place
with the screw and sealing washer.
NOTE: Use a small amount of Permatex
#1
on the inner
cam SUrface and screw threads. Remove any excess from
the impeller housing.
S. Apply a light film of silicone or petroleum jelly
to
the
inner surface of the housing for the impeller.
NOTE:
Coat only the surface, do not over-apply. Install
the impeller with the
drive
screw. Push the assembly into
the hausing with the drive screw mating in the slot of the
drive shaft.
6. Install the cover gasket and cover, and secure them With
the six cover screws.
7. Reposition and tighten the hose nipples. Assemble the
pump to the engine, and attach the hoses.
1. Install the seals and spacer in the pump housing. Push the
impeller side seal into the housing. Rotate the pump and
install the spacer against the seal face. Push the bearing
side 'seal into the housing from the bearing side.
CAM SCREW
1I0341462,~_
NOTE:
The seals'
fiat
sUrfaces that have printing
and
numbers face toward each other.
CAM 1I034J158,-
WATER SEAL 1104:80111 __
WASHER 11033037"
"'_
...
RiNG
SEAL 11033043
WHEN ASSEMBLING: APPLY A THIN COAT OF
GLYCERIN TO THE INSIOE OF THE COVER. THE
COVER D-RING, AND THE IMPELLER
SPACER 1138678
THE PRONGS ON THIS SPACER MUST·
FACE AGAINST THE OIL SEAL AS SHOWN,'
Engines
&
Generators
46
PN33636
)