Installation manual

ManualsBrandsWesterbeke ManualsAutomotive108C SIX

COOLING

SYSTEM

FRESH

WATER

COOLING

CIRCUIT

NOTE:

Refer

to

the

ENGINE

COOLANT

page

for

the

recommended

antifreeze

and

water

mixture

to

be

used

as

the

fresh

water

coolant.

Fresh

water

coolant

is

pumped

through

the

engine

by

a

circulating

pump,

absorbing

heat

from

the

engine.

The

coolant

then

passes

through

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

prevented

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

cooling

system.

Coolant

Recovery

Tank

A coolant

recovery

tank

allows

for

engine

'Coolant

expansion

and

contraction

during

engine

operation,:'wjthout

any

significant

loss

of

coolant

and

without

introducing

air into

the

cooling

system.

This

tank

should

be located

at

or

above

the

engine

manifold

level

and

should

be

easily

accessible.

COOLANT

RECOVERY

TANK

NOTE:

PeriodicaUy

check

the

condition

of

the

manifold

pressure

cap.

Ensure

that the

upper

and

lower

rubber

seals

are

in

good

condition

and

check

that

the

vacuum

valve

opens

and

closes

tightly.

Carry

a

spare

cap.

SEAL

CHECKING

THE

PRESSURE

CAP

CHANGING

COOLANT

The engine's coolant must

be

changed

according

to

the

MAINTENANCE

SCHEDULE.

If

the

coolant

is

allowed

to

become

contaminated,

it

can

lead

to

ovetbeating

problems.

A

CAUTION:

Proper

cooling

system

maintenance

is

,t:riflcal;

a

substantial

number

of

engine

failures

can

be

traced

back

to

cooling

system

corrosion.

Drain

the

engine

coolant

by

removing

the

drain

plug

on

the

engine

block

and

opening

the

manifold

pressure

cap.

Flush

tQe

,system

with

fresh

water,

then

reinstall

the

drain

and

start

the

refill

process.

Refer

to

the

illustration

below.

NOTE:

The

drain

petcock

on

the

heat

exchanger

can

also

be

used

to

help

drain

engine

coolant.

A

WARNING:

Beware

of

the

hot

engine

coolant.

Wear

protective

gloves.

Refilling

the

Coolant

After

replacing

the engine

block

drain

plug,

close

the

heat

exchanger's coolant

petcock.

Then

run

!he

engine

at

idle

and

slowly

poor

clean, premixed coolant

into

the

manifold.

Monitor

the

coolant in the

manifold

and

add

as

needed.

Fill

the

manifold

to

the

filler

neck

and

install

the

manifold

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.

After

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

and

check

the

coolant in the

manifold.

Clean

up

any

spilled

coolant.

TO

COOLANT

RECOVERY

TANK

FROM

COOLANT

RECOVERY

TANK

KEEP

THE

COOLANT

PASSAGE

CLEAR

COOLANT

EXPANSION

,/PRESSURE

,CAP

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