Westerbeke 20B TWO Installation Manual download pdf (Page 52)

ENGINE

ADJUSTMENTS

NOTE:

WESTERBEKE

recommends

that the following engine

adjustments

be

peiformed by a competent engine mechanic.

The

information below

is

provided

to

assist

the

mechanic.

FUEL

INJECTORS

NOTE:

WESTERBEKE recommends that

the

following engine

adjustments

be

peiformed by a competent engine

mechanic.

The

information below

is

provided

to

assist

the

mechanic.

REMOVING

FUEL

INJECTORS

NOTE:

Injector must

be

serviced

in

a "clean room"

environment.

1.

Disconnect

the

high pressure

fuel

lines

from

the

injectors

and

loosen

the

lines

at

their attachment

to

the

injection

pump

and

move

them

out of

the

way

of

the

injectors.

Avoid

bending

the

lines.

2.

Using

a

17mm

long

socket,

remove

the

fuel

return

line

in

its

entirety

from

the

top

of

the

injectors.

Take

care

not

to

loose

the

two

sealing

washers

and

banjo bolt that attaches

the

fuel

return line

to

each

injector.

NOTE:

Clean

the

area

around

the

base

of

the

injector

prior

to

lifting it out

of

the

cylinder head

to

help prevent

any rust or debris from falling

down

into

the

injector

hole.

If

the

injector will not lift out easily and

is

held

in

by carbon build-up or

the

like,

work

the

injector side-to-

side

with

the

aid

of

the socket

wrench

to

free

it,

and

then

lift

it

out.

3. The injector seats

in

the cylinder head

on

a

copper

sealing

washer.

This

washer should

be

removed

with

the

injector

and

replaced

with

a

new

washer

when

the

injector

is

reinstalled.

INSPECTING

THE

SPRAY

PATTERN

1.

Operate

the

hand lever of

the

nozzle tester

at

intervals of

one

stroke per second

to

check if

the

fuel

is

injected

correctly

in

its

axial direction. A

nozzle

is

defective if it

injects

fuel

in

an

oblique direction or

in

several

separate

strips.

Also,

a

spray

in

the

form

of particles indicates a

defect.

These defects

may

sometimes

be

caused

by

clogging

with

dust

and,

therefore,

all

parts

should

be

carefully cleaned before

reassembly.

DRIP

TEST

"""".....£:;;;?.

NORNAL

ij

FAULTY

~FAULTY

!\·

~l~

2.

Apply

the pressure of

1635

kg/cm

2

(115lb/in

2

)

to

nozzle

by

operating

the

hand

lever,

and

check

the

drips

from

the

nozzle

tip.

If

it drips or has a large accumulation of

fuel

on

the

bottom, it

is

considered defective

and

should be

replaced. A

very

small amount of

fuel

may

sometimes

remain

on

the

tip

of

the

nozzle;

however,

this

does

not

indicate a

defect.

A

WARNING:

The

spray

injected

from

the

nozzle

is

of

such

velocity

that

it

may

penetrate

deeply

into

the

skin

of

fingers

and

hands,

destroying

tissue.

If it

enters

the

bloodstream,

FUEL

INJECTION

PRESSURE

1991

TO

2134

psi

;

(140

TO

150

kgf/cm

2

)

13.73

TO

14.71

MPa

1 ./NOZZLE

INJECTION

Y"

TESTER

INJECTION

PRESSURE~_!

INJECTION

TESTING

1.

Using

the

nozzle

tester,

check

the

spray pattern

and

injection starting pressure of

the

nozzle.

If

it

exceeds

the

limit,

adjust or replace

the

nozzle.

When

using

a

nozzle

testee,

take

the

following precautions:

CHATTERING

TEST

,!

NORMAL

~~n

l

"'l'

ot!\

·~

fij

. J I

.

I1

FAULTY

;,

FAULTY

~!(J

,:·,

1'11'

.

r.'

J~"

A~

INSTALLING

Install

the

nozzle

and

nozzle

holder

assembly

in

the

reverse

order of

removal.

When

installing

the

nozzle

and

nozzle

holder

assembly,

use

a

new

copper

washer.

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