Weifang 495 - Injection - Pump and Governor

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by

a'

threaded

plug

and

conne:ctor

(C}is

used

to.

connect

.the

inlet

pipe

of

the

injection

pllmp

upp~rh,ousing

..

·

The

function

of

the'

fuel filter

is

to

£il

ter

.off

the

mec

hanical

impurities

from

the

fuel

to

reduce.

the

wea:r

of

:the.

precjse

elements

of

the

injection

pump

-and the,

injector.

After

the

fuel

being

filtered

through

the

filter

elemeIlt,

the

mechanical

imP.~t:iti~.~~re

remained

on

the

outer

surface

of

the

ele-

ment.

The

£lIter

element

is

made

of

diesel

ofl

filter,paper

and

is

good,tl1streti~~hand:p~rrrieaJ$ifi1:f~

But

theele~~t',rr:aYbe

broken

,

....

,'

,"

--.

'

.....:'..

'

......

'.:.

..•.

$:

. .,

..

"

..

';.r.:,'

',-

-

";

.t.~'"

.'.

~

.

when

if

is

chocked;~'4P'

wi'thCdirts.

Therefore,

tpe

'filter

element

should

be

cleaned

andrenew~e~regularly

acc6rding;t6

t~~

maint~

nance

regulations.

(4)

Injection

.

Pllmpl'~n4G9vernor

For

thesnk~

of

d~live:tih~

a

certain

amount

of

fu'elaccurately,

the

engine

is

provided

with

the

4

cylinder

r\i~.

I

pump

using

the

left

-

hand

pump

elements

of

8

mm

in

diameter.

The

front.

e

..

nd

of

the'

injection

pump

is fixed

on

the

gear

case

with

a

trianguiar,flimge

and'l;g,~

pump

is

driven

by

thecr_ank-

shaft

gear

fnxough

the

idling

gear

and

the

ipj~ctionptimpgear.

Meshing

marks

.are

marked

on

the

gears

to

ensure

the

cqrreft

in-

jection

timing.

The

accurat~

adjustment

of

injection

timing

is

ob-

tained

by

means

of

turning

the

injection.

pump

in

the

clockwise

or

counterclockwise···direction.

The

injection'

pu,mp

camshaft

rotates

in

a

pair

of

roller

bear-

ings

inside

-the

lower

housing'

of

the

injection

pump.

The

four

cam

lobes

on

the

camshaft

are

in

phase

with

the

firing

order

1

~3--.4

2

of

the

engine

respectively.

The

reciprocating

tappets

transmit

the

motion

of

the

canlsh~ft

to

the

pump

pl~nger

as

shown

Fig.

20.

46

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