Weifang 495 - Page 77

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During

the

operation,

the

feed

pump

draws

.fuel

from

fuel

tank

thro'ugh

the

cock

and

ftlel itl1et

pipe

and

delivers

it

into

the

fuel

fil-

ter~

After

being

filtered,

the

fuel

flows

i11tO

the

upper

housing

of

the

injection

pump.

Then

,depending

on

the

load

of

the

engine,

the

pump

element

controlled

by

the

pump

control

rod

delivers.1

certain

\

quantity.of

fuel

through

the

delivery

valve

~nd

fuel

injection

pipe

to

the

injector.

When

the

pressure

of

11768KPa

inside

the

injection

system

is

built

up,

the

needle

velve

will

be

lifted

opening

and

the

fuel

will

be

atomized

and

injected

into

the

combustion

chamber

to

burn

with

the

charged

air.

The

fuel

leaking

out

from

the

c1ea~ance

between

the

needle

valve

and

nozzle

-

body

will

return

to

the

fuel

tank

through

the

leak

-off

pipe

on'the

top

of

the

injector.

~

.

T-l1e

amourlt

of·

fuel

_fed

into

the

injection

pump

by

the

feed

pllmp

is

greater

than

that

needed

by

the

engine

in

operation,

The

surplus

fuel

will

flow

back

to

the

feed

pump

through

the

check

valve

so

that

the

fuel

will

circulate

in

the

upper

housing

of

the

in-:

jection

pump

constantly

to

prevent

it

from

air

trapped

inside.

1).

Construction

of

Main

Components

in

Supply

System

( 1)

Air

Cleaner

The

diesel

engine

is

provided

with

different

air

cleaner

accord-

ing

to

the

various

applications.

Model

495

diesel

engine

is

provided

with

a

model

t<

2007

air

cleaner

(Fig-

J.

7)

Model

495

diesel

engine

draws

in

air

of"

200m

3

per

hour

ap-

.

proximately-

If

the

dust

in

air

is

permitted

entering

the

cylinder

to-

gether

with

the

air,

then

the

piston

ring,

the

piston

and

the

cylin-

der

liner

will

be

worn

out

in

a

short

time,

The

function

of

an

air

cleaner

is

just

to

filter

the

air

before

it

enters

the

intake

manifold.

42

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