Westerbeke BTD 10.0 KW 60Hz Installation Manual download pdf (Page 20)

COOLING

SYSTEM

DESCRIPTION

Westerbeke

marine diesel engines are designed and equipped

for

fresh

water cooling. Heat produced in

the

engine

com-

bustion

and friction

transferred

fresh water coolant

which

circulates throughout the engine. This circulating fresh

water

coolant cools the engine block, its internal moving

parts,

and

the

engine

oil.

The heat is transferred externally

from

the

fresh water coolant to raw water

means

a heat

exchanger,

similar

function

an automotive radiator. Raw

water

flows

through

the

tubes

the heat exchanger while

fresh

water coolant

flows

around the tubes; engine heat trans-

ferred

the

fresh water coolant is conducted through

the

tube

walls

the

raw

water which is then pumped into the

exhaust system where

finally

it is discharged overboard. In

other

w~rds,

the

engine is cooled

fresh water coolant, this

coolant

IS cooled

raw

water,

and the

raw

water carries the

transferred heat overboard

through the exhaust

systetp..

The

fresh

water

co?lant

and

raw

water

circuits

are

independent

each

other.

Usmg only fresh water coolant within the engine

allows

the

cooling water passages to stay clean and free from

harmful

deposits.

FRESH

WATER

COOLING

CIRCUIT

NOTE:

Refer

the ENGINE COOLANT section for

the

rec-

ommended antifreeze and water mixture

used as

the

fresh

water

coolant.

F~h

water

coolant

.is

pumped through the engine

a circu-

latmg

pump,

absorbmg heat from the engine. The coolant

then

passes

through the thermostat into the manifold,

the

heat

ex:hanger

w~ere

cooled,.

and returned

the engine

block

Vla

the suctIon

SIde

of the

CIrculating

pump.

ENGINE

BLOCK

COOLANT

DRAIN

When the engine is started cold, external coolant

flow

pre-

vented

the

closed thermostat (although some

coolant

flow

bypassed around the thermostat

prevent the exhaust

manifold

from

overheating).

the

engine

warms

up,

the

thermostat gradually opens, allowing

full

flow

the

engine's

coolant

flow

unrestricted

the external portion of

the

cooling system.

Coolant

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. This

tank

should be located

or above

the

engine manifold level

and

should be easily accessible.

CHANGING

COOLANT

The engine's coolant must

changed according

the

MAINTENANCE SCHEDULE.

the coolant

allowed

become contaminated,

can

lead

overheating

problems.

CAUTION:

Proper

cooling

systllllJ

maintenance

critical;

substantial

number

engine

failures

can

traced

back

cooling

system

Co"os/on.

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.

Engines & Generators

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Westerbeke BTD 10.0 KW 60Hz Installation Manual Page 20

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