RAW
WATER
PUMP
Inspect
the
pump before disassembly, if the drive shaft
is
frozen
or
rotates with excessive play or roughness, replace
the entire pump.
NOTE:
Since
rebuilding a
pump
from individually purchased
parts
would
almost match
the
cost
of
a new
pump,
WESTERBEKE
recommends
purchasing a
new
pump
and
using
the
old pump for
spares.
PUMP
OVERHAUL
The pump,
as
removed from the engine, will have hose
attachment nipples threaded into its inlet and outlet port.
They
may
be left in place or removed
if
~ey
interfere.
~i~
the
pump disassembly. Note the port locauon
and
posluonmg
if
removed.
1.
Loosen
the
set screw with an allen wrench and remove
the water pump pulley from the shaft.
2.
Remove the four cover screws, the cover plate
and
the
cover plate gasket.
NOTE:
Replacement
of
the
cover plate gasket
is
recommended;
however;
it you
are
going
to
reuse
it,
keep
the
gasket well lubricated until the pump
is
reassembled.
If
it's allowed
to
dry,
the
gasket will shrink and not
be
reusable.
3. Pull out the impeller with long nose pliers or pry out with
a pair of screwdrivers.
RAW
WATER
PUMP
COMPONENTS
4. Remove
the
wear plate and the O-ring.
S.
Remove
the
cam
screw,
washer, and
cam.
6. Remove
the
bearing assembly, releasing
the
shaft,
bearing and seal assembly. This will allow the bearings
and seals
to
be disassembled for inspection.
NOTE:
It may be necessary
to
use
a drift and arbor press
to
press
the
bearing and seal assembly
from
the
shaft.
7. Inspect
all
parts
and
replace those showing wear
or
erosion.
S.
Use the illustration
to
assist in reassembling
the
raw
water pump.
a. Apply a small amount
of
petroleum jelly
to
the
seal's
inner race and
to
the impeller shaft at reassembly.
b. When positioning the cam in the housing
use
a small
amount
of
Permatex
#1
on the inner cam surface and
cam screw heads; remove any excess from
the
impeller
housing.
. c. Apply a light
film
of
silicon or petroleum jelly
to
the
inner surface of the housing for the impeller
9. When the pump
is
assembled, reposition and tighten the
hose nipples. Assemble the pump to
the
engine
and
attach
the hoses and the belt.
''''---CIlIVER
PLATE
Engines & Generators
37
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