Westerbeke 65B-FOUR Instrukcja Instalacji Pobierz pdf (Strona 29)

ENGINE

ADJUSTMENTS

REMOVING

THE

INJECTORS

NOTE:

Injector

must

be

senJiced

in

a

"clean

room"

environment.

1:

Disconnect

the

high

pressure

lines

from

the

injectors

and

loosen

the

lines

at their

at1achrnent

to

the injection pump

and

move

them

out of

the

way

of

the

injectors.

Avoid

bending

the

lines.

2.

Using

a

17rnrn

long

socket,

remove

the

fuel

return line

in

its

entirety

from

the

top

of

the

injettors.

Take

care not

to

lose

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

injt~ctor

hole.

If

the

injectqr

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

17mm

deep

socket

wrench

to

free

it

and

then

lift

it

out.

3. The injector

seats

in

the cylinder

head

on

a copper seal-

ing

washer.

1bis washer should be

removed

with the

injector

and

replaced

with

a

new

washer

when

the injec-

tor

is

reinstalled.

INJECTION

TESTING

1.

Using

the

nozzle

tester,

check the

spray

pattern

and

injec-

tion

~tarting

pre~sure

of

nozzle

and,

if it exceeds the

limit,

adjust or replace lhe

nozzle.

When

using nozzle

tester,

take the

following

precautions:

a. ·If

the

diesel

fuel

of

the

nozzle tester

is

discolored,

replace

it.

At the same

time,

clean

or

replace

the

filter.

b. Set the nozzle tester

in

a

clean

place where there

is

no

dust

or

dirt.

c. Mount the nozzle

and

nozzle holder

on

the nozzle

tester.

d.

Use

the

fuelat the approximate temperature

of

68°

F

(20°

C)

e.

Operate

lhe

band

lever

of nozzle tester several

times

to

bleed

the

air in.the

hOzzle

line,

then

move the

hand

lever

at intervals of one stroke per second while

read-

ing

t11e

injection starting

pressure.

A

CAUTION:

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,

it

may

cause

blood

poisoning.

FUEL

INJECTION

PRESSURE

FACTORY

SPECIFICATIONS

Inspecting

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

cor-

rectly

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

clog-

ging

with

dust

and,

therefore,

all

parts

should

be

carefully

cleaned

before

reassembly.

(Care should'be

taken

not

to

expose

ones

skin

to

this

spray

as

it

may

penetrate

the

skin

and

cause

infection.)

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FAULTY

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'"

CHATTERING

TEST

~,·,

2.

Apply

the

pressure

of

1991

kg/cm

2

(140

lb/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

an1ount

of

fuel

may

sometimes

remain

on

the

tip

of

the

nozzle;

however,

this

does

not

indicate

a

defect.

DRIP

TEST

The

injection starting pressure

for

the

injectors

is

adjusted

by

increasing or decreasing

the

thickness

of

the

adjusting

shim.

Pressure variation with O.Olmm (0.004in) difference

of

adjusting washer thickness. 235

kPa

(2.4 kgf/cm

2

,

4 psi) ·

ADJUSTING

SHIM

!

SHIM

THICKNESS

~

i

TYPICAL

INJECTOR

VALVE

TIGHTNESS

1.

Set

the

injector

nozzle

to

a

nozzle

tester.

2.

Raise

the

fuel

pressure

and

keep

it

at

12.75

MPa

(130kgf/cm

2

,

1849

psi)

for

10

seconds.

3.

If a

fuel

leak

is

found,

replace

the

nozzle

piece.

FACTORY

SPECIFICATIONS

No

fuel

leak

at:

12:75MPA

Engines

& Generators

130

kgf/cm

2

'

1849

psi

23

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