Westerbeke 108B Manual de instalación descargar pdf (Pagina 22)

COOLING

SYSTEM

RAW

WATER

COOLING

CIRCUIT

The

raw

water

flow

created

positive

displacement

impeller

pump.

This

pump

draws

water

directly

from

the

ocean,

lake,

river

through

hose

the

water

strainer.

The

raw

water

passes

from

the

strainer

through

the

heat

exchanger

(through

the

heat

exchanger

tubes)

where

cools

the engine'circulating

fresh

water

coolant.

The

raw

water

then

discharged

into

the

water

injected

exhaust

elbow,

mix-

ing

with

and

cooling

the

exhaust

gasses.

This

mixture of

exhaust

gas

and

raw

water

pushed

overboard.

Raw

Water

Pump

The

raw

water

pump

a self-priming,

rotary

pump

with

non-ferrous housing

and

a neoprene

impeller.

The

impeller

has

flexible

vanes

which

wipe

against a

curved

cam

plate

within

the

impeller

housing,

producing the

pumping

action.

account

should

this

pump

run

dryas water acts

lubricant

for

the

impeller.

There should

always

a spare

impeller

and

impeller

cover

gasket

aboard

(an

impeller

kit).

Raw

water

pump

impeller

failures

occur

when

lubricani

(raw

water)

not

present

during

engine

operation.

Such

failures

are

not

warrantable,

and

operators

are

cautioned

make

sure

raw

water

flo~

present

st~-up.

NOTE:

Should

afailure occur

with

the

pumps

internal parts

(seals and bearings),

may

cost

efficient

purchase a new pump and

rebuild

the

original

pump

spare.

Inspecting/Changing

the

Raw

Water

Pump

Impeller

the

raw

water

intake

valve.

Remove

the

pump

cover

and,

with

the

proper

size

impeller

tool,

carefully

pry

the

impeller out of the

pump

(the

impeller

can

pried

out

using

a pair

screwdrivers if

impeller puller

unavailable.

Take

care

not

tear

the

impeller).

Install the

new

impeller

and

gasket.

Move

the

blades

conform

the

curved

cam

plate

and

push

the

impeller

into

the

pumps

housing.

When

assembling,

apply a

thin

coating

lubricant

the

impeller

and

gasket.

Open the raw water intake

valve.,

' .

Run

the

~ngine

and

check

for

leaks

around

the

pump.

Also

check

for

water

discharge

the

stem

tube.

Absence

w.(lter

flow

indicates

the

pump

has

not

primed itself

properly.

NOTE:

Never allow

the

pump

run

dry.

Even

a short period

dry

running

may

destroy

the

impeller.

RAW

WATER

PUMP

PN52650

INSPECTION:

CHECK

THE

BASE

EACH

BLADE

BENDING

VIGOROUSLY.

REPLACE

THE

IMPELLER

THERE

ARE

ANY

CRACKS,

BAD

NEW:'

BA~

Heat

Exchanger

ZINC

ANODES

The

heat

exchanger

copper

tube

which

encloses a num-

ber of

small

copper

tubes.

Raw

water

pumped

through the

small

copper

tubes

and

the

freshwater

coolant

from

the

engine

circulated

around

the

copper tubes. The

raw

water

removes

heat

from

the

freshwater

coolant.

Zinc

Anode

A zinc

anode,

pencil,

located

the

raw

water

cooling

circuit

within

the

heat

exchanger.

The purpose of

the

zinc

anode

sacrifice

itself

electrolysis action taking place

the

raw

water

cooling

circuit,

thereby

reducing

the

effects

electrolysis

other

components

ttie

system. The con-

dition of

the

zinc

anode

should

checked

monthly

and

the

anode

cleaned

replaced

required.

Spare

anodes

should

carried

board.

NOTE:

Electrolysis action is

the

result

each particular

install~tion

and vessel

location;

not that

the

generator. '

If the

zinc

pencil

needs

replacement,

hold

the

hex

boss into

which

the

zinc

pencil

threaded

with

a wrench while loos-

ening

the

anode

with

another

wrench.

This prevents the hex

boss

from

possibly

tearing

off

the

exchanger shell. After

removing

the

zinc,

note

the

condition

it.

the

zinc is

poor

condition,

there

are

probably

a lot of

zinc

flakes within

the

exchanger.

Remove

the

end

the

heat

exchanger and

clean

the

inside

all

zinc

debris.

Always

have

a spare heat

exchanger

end

gasket

case

the

present

one

becomes dam-

aged

when

removing

the

end

cover.

Replace

the

gasket (refer

to your engine model's

heat

exchanger

end

gasket

part num-

ber),

a-ring,

cover,

and

install

new

zinc

pencil.

Heat,

Exchanger

Service

After

approximately

1000

hours

operation,

remove, clean

and

pressiIre

test

the

engine's

heat

exchanger.

local

auto-

, motive radiator

shop

should

able

clean

and

test

the

heat

, .

'::

exchanger.)

NOTE:

Operating

silty and/or tropical

waters

may require

that a heat exchanger cleaning

performed more often

than

every 1000

hours.

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Westerbeke 108B Manual de instalación Pagina 22

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