Westerbeke 108B Manual de instalación descargar pdf (Pagina 19)

COOLING

SYSTEM

DESCRIPTION

Westerbeke

marine

diesel

engines

are

designed

and

equipped

for

fresh

water

cooling.

Heat

produced

in

the

engine

by

com-

bustion

and

friction

is

transferred

to

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

by

means

of

a

heat

exchanger.

similar

in

function

to

an

automotive

radiator.

Raw

water

flows

through

the

tubes

of

the

heat

exchanger

while

fresh

water

coolant

flows

around

the

tubes;

engine

heat

trans-

ferred

to

the

fresh

water

coolant

is

conducted through

the

tube

walls

to

the

raw

water

which

is

then

pumped

into

the

exhaust

system

where

finally

it

is

discharged

overboard.

In

other

words,

the

engine

is

cooled

by

fresh

water

coolant,

this

coolant

is

cooled

by

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

to

stay

clean

and

free

from

harmful

deposits.

RAW

WATER

INTAKE

STRAINER

A

major

part

of

the

raw

water

cooling

system is a

proper

boatyardlbuilder

installed

intake

strainer.

NOTE:

Always

install

the

strainer

at

or

below

the

waterline

so

the

strainer

will

always

be

self-priming.

A

clean

raw

water

intake strainer

is

a vital component of

the

engine's

cooling

system.

Include

a

visual

inspection

of

this

strainer

when

making

your

periodic

engine

check.

The

water

in

the

glass

should

be

clear.

Perform

the

following

maintenance

after

every

100

hours

of

operation:

1. Close the raw water seacock.

2.

Remove

and

clean

the strainer

filter.

3.

Clean

the

glass.

4.

Replace

the

washer

if

necessary.

5.

Reassemble

and

install

the

strainer.

6.

Open the seacock.

7.

Run

the

engine

and

check

for

leaks.

NOTE:

Also

follow

the

above

procedure

after

having

run

hard

aground.

If

the

engine

temperature

gauge

ever

shows a higher

than

normal

reading,

the

cause

may

be

that silt, leaves

or

grass

may

have

been

caught

up

in

the

strainer,

slowing

the

flow

of

raw

water

through

the

cooling

system.

FI~TER

TYPICAL

RAW

WATER

INTAKE

STRAINER

(Owner

Installed)

INCOMING

RAW

WATER

SEACOCK-~""

-....;::-,::.==-;;;><

.

/

DRAINING

THE

RAW

WATER

SYSTEM

INSPECTANO

.

CLEAN

EVERY

laa

HOURS

When

freezing

temperatures

are

expected,

it

is

best

to

protect the

raw

water

cooling

circuit

and

engine

e)(haust

from

damage.

This

procedure

is

best accomplished

by

disconnecting

the

water

intake

hose

from

the

vessels

Ibm-hull

fitting.

Close the

intake valve before disconnecting the hose. Insert

the

hose

end

into a

large

container of

fresh

water.

Before starting

the

engine,

remove

the

engine thermostat

(replace the

gasket

and

cover).

This

will

ensure a

full

flow

of water

Ibm

the

engine.

Re-install the thermostat once

Hnshing is complete.

Run

the unit for \0

minutes

or

longer

to adequately

flush

the

cooling

system.

~

..

---.

-.

-

Provide

an

external

fresh

water

supply

for the bucket

to

maintain the

water

level in the bucket while

the

unit

is

being

operated

during

the

fiushing

process.

- .

The

fresh water

will

fiush

out the

engines

water

passages

and

. exhaust

lines.

If

the

engine

is

being

stored

and

there

is

a

probability of

freezing,

flush

the

engine

with

fresh

water

and

then

prior

to

shutting

the unit

down

substitute the

fresh

water

supply

with

a concentrated

antifreeze

mixture

and

run

this

through the

engine

to

provide

freeze

and

corrosion

protection

for both

the

engine

and

exhaust

system.

When

recommissioning,

make

certain

the

valves

and

seacocks

are

open

so

the engine

will

quickly receive

fresh.

water.

if

the

engine

is

stowed

where

it

is

warm,

the

fresh

water

can

stay

in

the

engine.

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