Westerbeke 38B FOUR Operator's Manual download pdf (Page 72)

Cooling Problems

Water

passages

inside

of

the

cooler

will

sometimes

become

clogged,

and

this

will

reduce

cooling

capacity

and

cause

overpressur

ing.

Back

flushing

of

the

cooler

will

sometimes

help

to

flush

the

foreign

material

from

the

cooler

passages.

The

cooler

and

hose

should

be

thoroughly

flushed

or

replaced

in

the

event

a

failure

has

occurred.

Metallic

particles

from

the

failure

tend

to

collect

in

the

case

of

the

cooler

and

gradually

flow

back

into

the

lube

system.

Replace

oil

cooler

to

prevent

contamination

of

the

new

transmission.

Water

hoses

may

collapse

and

reduce

or

completely

shut

off

all

flow

to

the

cooler.

Collapsed

hoses

are

usually

caused

by

aging

of

the

hoses

or

improper

hose

installation.

Hose

installation

should

be

made

with

no

sharp

bends.

Hoses

should

be

routed

so

there

is

no

possibility

for

engine

shifting

to

cause

hoses

to

pull

loose

or

become

pinched.

A

visual

inspection

of

hoses

while

under

way

will

sometimes

allow

detec-

tion

of

faulty

hoses.

Reduction

or

complete

loss

of

water

flow

can

be

caused

by

a

faulty

water

pump.

A

rubber

water

pump

impeller

will

sometimes

fail

and

after

such

a

failure

the

cooler

passages

may

be

restricted

by

the

par-

ticles

of

rubber

from

the

failed

impeller.

Water

pump

cavitation

may

be

caused

by

improper

or

faulty

plumbing

or

an

air

leak

on

the

inlet

side

of

the

pump.

The

water

pump may

not

prime

itself

or

may

lose

its

prime

when

inlet

plumbing

is

not

properly

installed.

It

is

possible

for

cross

leaks

to

occur

inside

the

cooler,

permitting

oil

to

flow

into

the

water

or

water

flow

into

the

oil.

Checking

transmission

fluid

levels

at

each

days

use

will

help

spot

such

a

hap-

pening,

undetectable

loss

of

fluid

and/or

emulsified

fluid.

Westerbeke Diesel Engines

70

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