Westerbeke 20B TWO Manual de instalación descargar pdf (Pagina 24)

COOLING

SYSTEM

RAW

WATER

PUMP

The

raw

water

pump

is

a,self-priming;

rotary

pump

with

a

non-ferrous

housing

and

a

Neoprene

impeller.

The

impeller

has

flexible

blades

which

wipe

against a curved

cam

plate

within

the

impeller

housing,

producing

the

pumping

action.

On no account should this

pump

be

run

dry.

There

should

always

be a

spare

impeller

and

impeller cover

gasket

aboard

(an

impeller

kit).

Raw

water

pump

impeller

failures

occur

when

lubricant

(raw

water)

is not present

during

engine

operation.

Such

failu:t;eS

are

not

warrantable,

and

operators

are

cautioned

to

make

sure

raw

water

flow

is

present

at

start-up.

The

raw

water

pump

should

be

inspeCted

peripdically

for

broken

or tom impeller

blades.

See

MAiNTENANCE S9HEDULE.

NOTE:

Shoulcl

a failure occur

with

the

pumps

internal

parts

(seals

and

bearings),

it may

be

more

cost efficient

to

p!fri::hase

a

new

pump and rebuild

the

original

pump

as

·a

spare.

Impeller Kit

#048500

IMPELLER

..

INSPECTION:

CHECK

AT

THE

BASE

OF.

.

EACH

BLADE

BY

BENDING

VIGOROUSLY.

·

REPLACE

THE

IMPELLER

IF

THERE

.

ARE

ANY

CRACKS..

.

WHEN

INSTALI.fNG:

TAKE

CARE

TO

ALIGN

THE

IMPELLER

KEYWAY

WITH

THE

SHAFT

KEY.

FOLD

THE

IMPELLER.

BLADES

IN

EITHER

DIRECTION

(THEY

WILL

TURN

IN

THE

CORRECT

POSITION

WHEN

THE

IMPELLER

STARTS

TO

ROTATE).

RAWWAlER

PUMP

#048080

CHANGING

THE

RAW

WATER

PUMP

IMPELLER

Close

the

raw

water

intake valve.

Remove

the

pump

cover

and

gasket

or 0-ring

with

the

aid

of

two

screwdrivers

or pli·

ers.

Carefully

pry/pull

the

impeller out of the

pump.

Lightly

coat

the

inside of

the

pump

housing

with

glycerine.

InstaU

the

new

impeller

and

cover

with

gasket,

open

the

raw

water

intake valve.

NOTE:

Never allow the pump

to

run

dry.

Even a short period

of

dry

running

may

destroy

the

impeller.

RAW

WATER

PUMP

(EARLY

MODELS)

·

SAME

INSTRUCTIONS

APPLY

. ·

Impeller Kit

#034440

ALIGN·

THE

IMPELLER

SCREW

WITH

THE

·

SLOT

IN

THE

SHAFT

NOTE:

lfany

of

~he

vanes

have

broken

off

the

impeller

th'ey

must

be

found to'jm!vent blockage

in

the

cooling

circuit.

They

ofte~

can

be

found

i~

the heat

exchanger.

RAW

WATER

INTAKE

STRAINER

A clean raw water intake strainer

is

a

vital

component

of

the

engine's cooling

sys&m1:.

Include a

visual

inspection

of

this

.

strainer

when

making

your periodic engine

check.

The

water

in

the

glass should be

clear.

Perfonn the

following

:tnaintenance

after

every

100

ho.urs'

of

operation:

· · .

1.

Close

the

raw

water

seacoclc. ·

2.

Remove

and

clean

the

strainer

filter.

3.

Clean

the

glass.

· 4. Replace the

washer

if

necessary.

5.

Reassemble

and

install the

strainer.

6.

Open

the

sea

cock.

7

•.

Run

the

engine

and

check for

leaks.

NOTE:

Also follow

tlte

above procedure after

having

run

harrl

aground.

H the engine temperature gauge ever

shows

a higher

than

nonnal

reading,

the

cause

may

be

that

silt,

leaves

or

grass

may

have

been

('.aught

up

in

the

strainer,

slowing

the

flow

of

raw

water

through

the

cooling

system.

NOTE:

Always install

the

strainer at or

belo~

the

waterline

so

the

strainer will always

be

self-priming.

TYPICAL

RAW

WATER

INTAKE

STRAINER

(OWNER

INSTALLED)

·

Eng!f!fl.~~~.:.o~IJnerators

18

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 71 72

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