Westerbeke W-70GA Manual de instalación descargar pdf (Pagina 19)

COOLING

SYSTEM

DESCRIPTION

Westerbeke

marine engines are designed

and

equipped

for

fresh water

cooling.

Heat produced

the

engine

combus-

tion

and

friction

transferred

fresh

water coolant

which

circulates throughout the engine.

TIris

circulating

fresh

water

coolant cools

the

engine

block,

its

internal moving parts,

and

the engine

oil.

The heat

transferred externally

from

the

fresh

water

coolant

raw

water

means of a heat

exchanger,

similar

function

automotive radiator.

Raw

water

flows

through

the

tubes

of the heat exchanger

while

fresh water coolant

flows

around the

tubes;

engine heat

trans-

ferred

the

fresh

water coolant

conducted through the

tube

walls

the

raw

water which

then

pumped into

the

exhaust system

where

finally

it is discharged overboard.

other

words,

the

engine

cooled

fresh water coolant,

this

coolant

cooled

raw

water,

and

the

raw

water carries the

transferred heat overboard through

the

exhaust system. The .

fresh

water

coolant

and

raw

water circuits are independent of

each

other.

Using

only fresh water coolant within

the

engine

allows

the

cooling water passages

stay clean and

free

from

harmful

deposits.

FRESH

WATER

COOLING

CIRCUIT

NOTE:

Refer

the ENGINE COOlANT section for the

recommended antifreeze

and

water mixture

be used as the

fresh water

coolant.

Fresh water coolant

pumped through

the

engine

a circu-

lating

pump,

absorbing heat from

the

engine. The coolant

then

passes

through the thermostat into the manifold,

the

heat exchanger

where

cooled,

and

returned

the engine

block

via

the

suction side of the circulating

pump.

When

the

engine

started cold, external coolant

flow

prevented

the closed thermostat (although some coolant

flow

bypassed

around

the

thermostat

prevent the exhaust mani-

fold

from

overheating). As the engine

warms

up,

the thermo-

stat

gradually

opens, allowing full

flow

of the engine's

coolant

flow

unrestricted

the

external portion of

the

cooling

system.

~oolant

Recovery

Tank

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.

TIris

tank should be located at or above the

engine manifold

level

and

should be easily accessible.

NOTE:

Periodically check the condition

the manifold pres-

sure

cap.

Ensure

that the upper

and

lower rubber seals

are

good condition and check that

the

vacuum valve opens

and

closes

tightly.

Carry

spare

cap.

CHANGING

COOLANT

The

engine's coolant must

changed according

the

MAINTENANCE

SCHEDULE.

-If

the

coolant

allowed

become

contaminated, it

can

lead

overheating

problems.

CAUTION:

Proper

cooling

system

maintenance

critical;

substantial

number

engine

failures

can

traced

back

cooling

system

corrosion.

Drain

the

engine coolant

loosening

the

drain

plug

the

engine block

and

opening

the

manifold pressure

cap.

Flush

the

system

with

fresh

water,

then

start

the

refill

process.

NOTE:

The

drain

petcock

the heat exchanger should also

used

help drain engine

coolant.

WARNING:

Beware

the

hot

engine

coolant.

Wear

protective

gloves.

Refilling

the

Coolant

After replacing the engine block drain plug,

the

heat

exchanger's coolant

petcock.

Then

run

the

engine

idle

and

slowly

pour

clean,

premixed

coolant

into

the

manifold.

NOTE:

Open

the

air-bleed petcock on

the

heat

exchanger.

When

a steady flow

coolant appears at

the

petcock,

the

petcock and fill

the

system until the manifold

remains

full.

Monitor

the

coolant

the manifold

and add

needed.

Fill

the

manifold

the

filler

neck

and

install the

manifold

pres-

sure

cap.

Remove

the

cap

the

coolant recovery tank

and

fill

with

coolant

mix

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

cool.

Coolant should

draw

back into the cooling

system

the

engine

cools

down.

Add

coolant

the

recovery

tank

needed.

Clean

any

spilled coolant.

COOLANT

EXPANSION

COOLANT

RETRACTION

Engines & Generators

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 63 64

Comentarios a estos manuales

Sin comentarios

Westerbeke W-70GA Manual de instalación Pagina 19

Comentarios a estos manuales

Relacionado con productos y manuales para Motor Westerbeke W-70GA