Westerbeke 20B TWO Installationshandbuch PDF herunterladen (Seite 26)

COOLING

SYSTEM

Zinc

Anode

#011885

A

zinc

anode,

or pencil, is located in the

raw

water cooling

circuit

within

the heat

exchanger.

The

purpose

of

having

the

zinc

anode

is

to sacrifice

them

to electrolysis

action

taijng

place in

the

raw

water cooling circuit,

thereby

reducing

the

effects of electrolysis on other

components

of

the

system.

The

condition

of

the

zinc

anode

should

be

checked

monthly

and

the

anode

cleaned or replaced

as

required:

Spare

anodes

should

be

carried

on

board.

If

the

zinc

anodes

need

replacement,

hold

the

hex

boss

into

which

the

zinc

anode

is

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

of

it.

If

the

zinc

is

in

poor

condition,

there

are

probably·

a lot of

zinc

flakes

within

the

exchanger.

Remove

the

end

of the

heat

exchanger

and

clean

the

inside

of

all

zinc

debris.

Always

have

a

spare

heat

exchanger

end

gasket

in

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),

0-ring

and

cover,

and

install a

new

zinc

anode.

NEW_

REPLACE

REPLACE

ZINC

ANODES

CLEAN

AND

REUSE

NOTE:

The

threads

of

the

zinc anodes

are

pipe

threads

and

do

.not

require

sealant. Sealant should not

be

used

as

it

may

insulate

the

zinc from

the

metal ofthe heat exchanger

hous-

ing

preventing electrolysis action on

the

zinc.

Heat

Exchanger

Service

.

After

approximately

1000

hours

of

operation,

remove,

clean

and

pressure test the engine's heat

exchanger.

(A

local

auto-

motive

radiator

shop

should

be

able

to clean

and

test

the

heat

exchanger.)

NOTE:

Electrolysis action

is

the result

of

each particuidr

installation

and

vessel location; not that

of

the

engine.

NOTE:

Operating

in

silty and/or tropical waters

may

require

that a heat exchanger cleaning

be

performed

more

often

than

every 1000

hours.

COVER

SECURING

BOLT

INSPECT

BOTH

ENDS

HEAT

EXCHANGER

ZINC

ANODE

DO

NOT

USE

SEALANT

ON

THE

THREADS

WATER

CLEAN

OUT

EVERY

'DRAIN

tOO

HOURS

CLEAN

OUT

DEBRiS

TYPICAL

ASSEMBLY

-

ANTIFREEZE

COOLANT

•DRAIN

(PETCOCK

OR

HEX

PLUG)

NOTE:

When

installing the heat exchanger end

covers.

Be

~ure

that the end cover securing bolt's sealing 0-ring

is

installed.

Failure

to

install

this-

sealing 0-ring

can

result

in

end plate failure/sea water

leakage.

Engines & Generators

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