Двигатели Scania четвёртой серии. Руководство - часть 235

03:14-01

11

H - Hi

gh 

pr

es

su

re

 check

H

 - H

ig

h p

re

ss

u

re

 ch

eck

R

enew c

yl

inder

 head on high pre

ss

ur

e pump, see 

descr

iption 

H9

. C

ontinue fr

om

 S-

a.

Th

e p

re

ss

u

re

 is n

orm

al

H-

a The

 engine starts. Carr

y out

 

de

scriptio

n 

H1

, Chec

ki

ng the 

accumulator pr

essure. I

f the engine 

doe

s not star

t, c

ont

inue

 f

rom 

H-

d.

R

epair the lea

k, continue 

from

 S-

a.

R

enew the valve. C

ontinue 

from

 S-

a.

Exte

rnal

 leaks

The safet

y val

ve

 is

 

de

fe

ct

ive.

Th

e p

re

ssu

re

 is f

alli

ng

Carr

y out

 a

 che

ck on the safe

ty 

valve

, s

ee de

sc

ripti

on 

H3

.

No exte

rnal

 le

ak

s

Th

e p

re

ss

u

re

 is

 

nor

m

al

The safe

ty valve is n

ot 

fa

ul

ty

Car

ry out a che

ck on the 

re

turn fue

l pr

essure, in 

ac

cor

dance

 wi

th 

de

sc

ripti

on 

H2

.

R

enew cylinder

 head on 

hi

gh pr

essure pump, see

 

description 

H9

. Continue 

from troubleshooti

ng tre

e 

S-a

.

H

igh or fluctuating 

re

tu

rn

 fu

el

 pr

essur

e

Cont

inue

 from 

troubleshooting t

ree 

H-

b

.

H - Troubleshooting tree

12

03:14-01

H

 - H

ig

h p

re

ss

u

re

 ch

eck

Renew

 th

e safe

ty

 va

lv

e,

 continue fr

om

 S-

a.

Ch

eck

 fai

le

d

C

arry out a c

heck on the

 sa

fety va

lv

e,

 in

 a

ccor

dance

 

wit

h de

scription 

H3

.

Flu

ct

uat

in

g p

ressure

Ch

ec

k p

assed

H-

b

 High or fluctua

ting re

tu

rn

 fuel 

pr

essure

Cont

inue

 from 

High pressure 

below.

High

 pr

ess

u

re

Cyl

in

d

er i

d

en

ti

fi

ed

, see 

troubl

es

hoot

ing tre

e 

H-

c.

C

he

ck the i

nje

ctors u

sing S

D

P3, see 

descr

iption H4.

Faul

t ve

ri

fi

ed

, Renew

 

injector and continue from 

S-a

.

Carr

y out

 Chec

king for interna

l 

lea

ks, s

ee desc

ripti

on 

H6

.

C

yli

n

de

r n

ot i

de

nti

fi

ed

Th

e i

n

je

ctor

 cann

ot be ve

rified

. 

Detac

h 

and vis

ua

lly

 ins

pe

ct 

al

l hi

gh 

pre

ssur

e conne

ctions

 a

nd t

or

que 

tighten them. Conti

nue

 from

 S

-a

.

H - Troubleshooting tree

03:14-01

13

H

 - H

ig

h p

re

ss

u

re

 ch

eck

Re

new th

e ide

ntif

ie

d inj

ec

tor

, 

cont

inue f

rom 

S-

a.

F

ault

 v

eri

fi

ed

C

arry out Checking for

 in

ter

nal 

le

aks, see

 descr

iption 

H6

.

The

 f

aul

t c

ann

ot 

be

 

veri

fi

ed

Th

e i

n

je

ctor

 cann

ot be identified

. 

De

ta

ch and visually in

spect all high pressure

 

conne

ctions

 a

nd torque tight

en

 them. 

Cont

inue

 from 

S-

a.

Ver

if

y wit

h plug, in ac

corda

nce w

ith 

descr

iption 

H5

.

Cy

lind

er

 id

en

ti

fie

d

Faul

t ve

ri

fi

ed

H-

c C

he

ck the injector

s using 

SD

P3.

Renew

 in

je

ctor and c

ont

inue f

rom 

S-

a.

H - Troubleshooting tree

14

03:14-01

H

 - H

ig

h p

re

ss

u

re

 ch

eck

Conti

nue

 from 

S-

a.

T

h

e e

ngine star

ts

R

ene

w the

 f

uel

 inle

t me

te

ri

ng va

lve.

The safet

y val

ve

 is

 

work

ing

Th

e e

n

gi

ne

 will n

ot s

tar

t

C

arry out che

ck 

H8

.

Rene

w 

the cylinder head on 

the hi

gh 

pre

ssure pump. S

ta

rt again fr

om

 S-a

.

Nor

m

al or low re

turn fu

el

 

pr

es

sur

e

T

h

e safe

ty valve is n

ot 

work

ing

H-

d

 The

 engine will

 not

 st

ar

t. 

Carr

y 

out che

ck 

H7

.

Rene

w t

he

 safe

ty

 va

lve, continue 

fr

om

 S-

a.

R

eturn fuel p

ressu

re

 too high

, 

C

ontinue from 

C

yl

inde

r not 

ve

rif

ie

d 

in

 H-

b

.

H - Troubleshooting tree