Service manual

ManualsBrandsWesterbeke ManualsEngineWMD12.5

RAW

WATER

PUMP

PUMP

OVERHAUL

NOTE:

Since

completely rebuilding a damaged or

worn

pump

from individually purchased parts would almost

match

the

price

of

a new

pump,

WESTERBEKE recommends that a

new

pump

be

purchased.

Before disassembling the raw water pump, inspect the

pump by rotating the drive shaft.

If

it is rough , frozen, or

seems to have excessive play, replace the entire pump.

Disassembly

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

they

interfere

with

the

pump

disassembly.

Note the port location

and

positioning

if

removed.

1.

Loosen

the

set

screw

with

an

allen wrench

and

remove

the

water

pump

pulley

from

the shaft.

Taking

care not

to

lose

the

key.

2.

Remove

the

four cover

screws,

the

cover

and

the

cover

gasket.

NOTE:

Replacement

of

the

cover 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 a pair

screwdrivers.

4.

Remove

the

cam

screw

and

cam.

HOUSING

GASKET

5.

Remove

the

housing

assembly,

releasing

the

shaft,

bearing

and

seal

assembly.

This

will

allow

the

bearing

and

seal

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.

6.

Inspect

all

parts

and

replace

those

showing

wear

or

erosion.

7.

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 Pennatex

#1

on

the inner

cam

surface

and

cam

screw

head;

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

8.

When

the

pump

is

assembled, reposition

and

tighten

the

hose nipples into

the

pump housing,

use

Teflon

sealant

on

the

nipple

thread. Assemble the

pump

to

the

engine

and

attach

the

hoses

and

the

belt.

RAW

WATER

PUMP

Engines & Generators

44