Westerbeke M-50B Manual de instalación descargar pdf (Pagina 20)

ENGINE

COOLING

CIRCUIT

DESCRIPTION

The

engine

is

fresh

water cooled

(engine

coolant)

by

an

engine-mounted

heat

exchanger.

Raw

water

is

pumped

through

the

heat

exchanger

by

a

gear-driven,

positive

dis-

placement

impeller

pump.

After

the

raw

water cools the

engine

coolant

in

the

heat

exchanger,

it

mixes

with the

engine's

exhaust

gases,

cools

the

exhaust

gases,

and

dis-

charges

overboard.

The

engine's coolant

is

circulated

by

a belt-driven centrifu-

gal-type

metal

impeller

pump

mounted

on

the

front of

the

engine.

The

engine's coolant temperature

is

thermostatically

controlled.

The engine's coolant

must

be

changed

according

to

the

main-

tenance

schedulO'in

this

manual.

If

the

coolant

is

allowed

to

become

contaminated,

it

can

lead

to

overheating problems.

ACAUTlON:

Propllr

cooling

systBm

mainfBnanclI

is

critical;

a

substantia/numbllr

of

IInglnll

failures

can

bll

traced

back

to

cooling

systllm

corrosion.

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

is

best located

at

or

above

the

engine

manifold

. should

be

easily

accessible.

COOLANT

RECOVERY

TANK

MHOB.

M·!lJB

COOLANT

DRAIN

JUST

ABOVE

TH~E

MOUNT

M·40B

M·25XPB

M·35B

COOLAln

DRAIN

MANIFOLD

M·50B

COOLANT

DRAtN

CAP

HEAT

EXCHANGER

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.

See

the

Parts

Identification

photos

in

this manual for locations.

.

NOTE:

The

petcock

on

the

heat

exchanger

can

also

be

used

to

help

drain

engine

coolant.

AWARNING:

Beware

of

the

hot

engine

coolant.

Wear

protectiVII

gloves.

To

Refill

With

Coolant

With

the

engine running

in

idle, slowly pour

clean

premixed

coolant into

the

manifold.

NOTE:

Open

the

petcocks

on

the

thermostat

housing

and

heat

exchanger

to

help

remove

air

from

the

system.

When

a

steady

flow

of

coolant appears

at

the

drain

plug

opening,

close

the

water

drain

plug and

continue

to

fill

the

system

until

the

manifold

remains

full.

Close'lhe petcock

on

the

heat

exchanger

when

antifreeze

flows from

it.

.

Monitor

the

coolant

in

the

manifold

and

add

as

needed.

Fill

the

manifold

to

the

filler

neck and install the pressure

cap.The petcock

on

the

thermostat should

also

be

opened

when

refilling

to

allow

trapped air

to

escape.

Remove

the cap

on

the

coolant recovery tank,

fill

with

coolant

mix

to

halfway

between

LOW

and

MAX,

and

replace the cap.

Run

the

engine, close

all

petcocks

and

observe

the

coolant

expansion

flow

into

the

recovery

tank.

After checking for leaks,

stop

the engine

and

allow

it

to

cool.

Coolant

shoui:!

draw

back

into

the cooling system

as

the

engine

cools

do·vn.

Add

coolant to

the

recovery

tank

if

needed.

Clean

up

'ny spilled coolant.

PRESSURE

CAP

PRESSURE

CAP

NOTE:

Periodically

check

the

condition

of

the

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.

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