Yangdong Co. Y90 Series Especificações descarregar pdf (Página 21)

check

a fauly iniector,Le.loosen

the

nuts

of

iniection

pipe

from

the

injector

of

every

cylinder

successively,and

observe

the

exhaust

smoke.

When

the cyl1nder

with

the

faulty

inlector

stops

firing~black

smoke

wouid

disappear

and

engine

speed

is

not

appreciably

affected

or

not

affected

.

at

all.It

may

also

be

checked

by listening

to

the

chattering

action

of

the

injector

of

every

cylinder

\vith

the

flywheel

rotating.Ifthe

d~stjnct

clear

sharp

sound

of

certain

cylinder

could

not

be

heard,

the

injector in

this

cylinder

may

be faulty.

I.Procedure

of

injector

testing

and

adjustnll~nt

(1

)W

()rk

the

injector

tester

hand

pump

unti I the

gauge

pressure

reaches

about

specified

injection

pressur~.

'rhen

operate

the hand pUlnp slo\\'ly

and

adjust

the

inlection

pressure

at

\Nhich injection

begins.'rhe

nozzle should not sho",'

any

si~~ns

of

leakage.

If

fuel

drips

around

the

nozzle

tip after several tests.,the nozzle

set

must

be

dismantled

for

cleaning

and

~'Tinding~"'hen

test it again.

(2)Rernove

the

lock nut,turn the adjusting

screw

to

get

the

pressure

at

the

beginning

of

injection which should be

specified

value

in section

I.Then

tighten

the

lock

nut,and

test it again.

(3)Work

the

hand

pump

at

a rate

of

approxirnatetv 1

stroke

per

second

and

observe

the

nozzle

spray 'The fuel

spray

shoulJ

be

even,and

well

atomized

in a

shape

of

cone.At

any

cross

section

of

the

conc,the

atomizt:d thel should be finely

and

evenly

distributed.Fuel

droplets

and

irregular pattern \vhich

can

be

seen

by naked eyes should

not

be

present

in

the

spray_

There

should

be a distinct

clear

sharp

sound

at

the

end

of

iniection.Generally"ilTcgular pattern

of

the

spray

is

caused

by

needle

valve

seizure~fuel

drrpping is

generated

by

danlaged

conical

sealing

surface

of

needle

valve and

spray

spIlt results frorn carbon

deposits

on

the

tip

of

nozzle

and its

heat

dt~fornlation.

2.Iniector

dismantlclnent

and

repair

('

i

)Before

dismantling

the

injector.clean

off

the

dirt

gathered

on

1t

,(~lamp

the

nozzle

body

in a

vice

lined by

copper

sheets

on

its law \\lith the

nozzle

up\vard.rrurn

off

the

nozzle

cap

nut

and

take

out

the

nozzle

set,[)ra\v

Ollt

1he

needle

valve

from

the

nozzle

body

and

soak

it in c.lean

tllei

oil.Then

clalnp

the

injector

in the vice upside dow'n

again.Disnlantle

the

adjusting

nut,and

adjusting scre\v,then take

out

the lnlcctor

spring

and splndle.

(2)

If

the nozzle

set

is seized

or

elnits fuel badlv.it nHl,St

he

cleanecl.Soak

the

seized nozzle

in fuel oil tc)r a

while.and

clalnp

the

needle

valve

by

a

p1it:~rs

with

cloth

lined.Then

rotate

and

draw

it

out

slo\vly,iust to

avoid

scratching

its

su~'fac.e,Decarbonize

the

needle

valve

and

nozzle

body

'Nith

wooden

chip

soaked

in

fllCI

oi1.It is forbidden to clean

them

with

111

etaI chip.

If

the

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