Westerbeke 108B Installationshandbuch PDF herunterladen (Seite 21)

COOLING

SYSTEM

FRESH

WATER

COOLING

CIRCUIT

NOTE:

Refer

to

the

ENGINE

COOLANT

section for

the

rec-

ommended

antifreeze

and

water

mixture

to

be

used

as

the

fresh

water

coolant.

Fresh

water coolant

is

pumped

through

the

engine

by

a

circu-

'Iating

pump,

absorbing

heat

from

the

engine.

The

coolant

then

passes thrqugh

the

thermostat

into

the

manifold,

to

the

heat

exchanger

where

it

is

cooled,

and

returned

to

the

engine

block

via

the

suction

side

of

the

circulating

pump.

When

the

engine

is

started

cold,

external

coolant

flow

is

pre-

vented

by

the

closed

thermostat

(although

some

coolant

flow

is

bypassed

around

the

thermostat

to

prevent

the

exhaust

manifold

from

overheating).

As

the

engine

warms

up,

the

thermostat

gradually

opens,

allowing

full

flow

of

the

engine's

coolant

to

flow

unrestricted

to

the

external

portion of

the

coolinll

s¥stem.

TO

COOLANT

RECOVERY

TANK

FROM

COOLANT

RECOVERY

TANK

KEEP

THE

COOLANT

PASSAGE

CLEAR

COOLANT

RETRACTION

NOTE:

Periodically check

the

condition

of

the

manifold

pressure

cap.

Ensure

the

upper

and

lower

rubber

seals

are

ill

good

conditiOl~

Check

to

ensure

.

the

vacuum.

valve opens

and

closes tightly. Cany a spare

cap.

Check also

to

ensure

the

cooLant

passa.ge

is

clear so

coola:nt

within

the

system is

able to expand

and

contract

to

andfrom the coolant recovel)'tank

Coolant

Recovery

Tank

SEAL

A coolant

recovery

tank

allows

for engine coolant

expansion

and

contraction

during

engine

operation,

without

any

signifi-

cant

loss

of coolant

and

without introducing air into

the

cool-

ing

system.

This

tank

should

be

located at

or

above

the

engine

manifold

level

and

should

be

easily accessible.

NOTE:

TI.;s

tank,

with

its shOlt run

of

plastic

hose,

is best

located at or above

the

level

of

the

engine

~

manifold.

CHANGING

COOlANT

The

erigine's

coolant

must

be

changed according

to

the

MAINTENANCE

SCHEDULE.

If

the

coolant

is

allowed to

become

contaminated,

it

can

lead

to

overheating problems.

A

CAUTION:

Proper

cooling

system

maintenance

is

critlcalj

a

substantial

number

of

engine

failures

can

be

traced

back

to

cooling

system

corrosion.

Drain

the

engine

coolant

by

loosening

the

drain

plug

on

the

engine

block

and

opening

the manifold pressure

cap.

Flush

the

system

with

fresh

water,

then

start

the

refill process.

NOTE:

The

drain

on

the

heat

exchanger should also

be

used

to

help

drain

engine

coolant.

ENGINE

BLOCK

~

fl00LANT

DRAIN

~"~

OIL

GALLERY

Refilling

the

Coolant

After

closing

the

engine

block

drain,

pour

clean, premixed

coolant

into

the

manifold

and

when

the

coolant

is

visible

in

the

manifold,

start

the

engine

and

run

it

at

slow

idle.

Open

the

air

bleed

petcocks

on

the manifold

and

the

thermostat

housing.

Monitor

the

coolant

in

the

manifold

and add

as

needed. Fill

the

manifold

to

the

filler

neck

and

when

the coolant

flowing

from

the

petcock

is

free

of

air

bubbles,

close the petcock

and

install

the

pressure

cap.

Remove

the

cap

on

the

coolant

recovery

tank and

fill

with

coolant

mix

to

halfway

between

LOW

and

MAX

and

replace

the

cap.

Run

the

engine

and

observe

the

coolant expansion

flow

into

the

recovery

tank.

When

the petcock

on

the

thermo-

stat

housing

is

free

of

air

bubbles, close

that

petcock.

J\fter checking

for

leaks,

stop

the

engine

and

allow

it to

cool.

Coolant

should

draw

back

into

the

cooling

system

as

the

engine

cools

down.

Add

coolant

to

the

recovery

tank if

needed.

Clean

up

any

spilled coolant.

A

WARNING:

Beware

of

the

hot

engine

coolant.

Wear

protective

gloves.

'~/WESTERBEKE

""

_ ,

__

::1

..Enaines & Generators

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