Двигатели Scania четвёртой серии. Руководство - часть 234

 

  Главная      Автомобили - Scania     Двигатели Scania 4-ой серии - руководство по эксплуатации и ремонту

 

поиск по сайту           правообладателям

 

 

 

 

 

 

 

 

 

содержание   ..  232  233  234  235   ..

 

 

Двигатели Scania четвёртой серии. Руководство - часть 234

 

 

03:14-01

7

L

 - L

ow p

ressu

re c

he

ck

R

enew the ha

nd pum

p. Contin

ue

 

from

 L-

a.

...of

 the fe

ed p

u

mp

R

enew the f

eed pump.

L-

b

 F

ue

l only c

om

es ou

t of

 o

ne

 

pump...

T

h

e pu

mp

 dr

iv

e i

work

in

g c

orre

ctl

y

C

he

ck the f

eed pump drive, 

continue fr

om

 de

sc

ripti

on 

L4

.

...of the han

d

 pu

mp

No fuel come

s ou

t

T

h

e pu

mp

 dr

iv

e i

de

fec

ti

ve

C

he

ck the fe

ed pump, continue from 

descr

iption 

L3

.

Re

ct

if

y in ac

corda

nce

 w

ith

 

description 

L5

, then 

conti

nue

 to 

S-a

.

A l

ittl

e f

ue

l c

omes ou

t

Rene

w t

he

 fee

d pump 

and 

bl

ee

d the

 fuel

 syst

em

, t

hen 

co

ntinue to 

S-

a.

L - Troubleshooting tree

8

03:14-01

L

 - L

ow p

ressu

re c

he

ck

Conti

nue

 from troubleshooting

 tr

ee 

H-

a.

Th

e p

re

ss

ure

 is

 n

orm

al

Th

e p

ressu

re

 is h

igh or normal

Th

e p

ressure is too hi

gh

L-

c F

ue

l c

om

es out

 of

 bot

h the 

pumps. Me

asure 

the supply 

pressure

 

in ac

corda

nce w

ith de

sc

ripti

on 

L6

.

R

ene

w f

ilte

r and f

eed pum

p, 

contin

ue

 to description 

L-

c.

Th

e p

ressu

re

 is too low

T

he

 pr

essur

e i

s corr

ect

R

enew f

ilter

. B

lee

d t

he

 fuel system 

and st

art

 aga

in from

 L-

c.

Continue to  trouble

shooting tree

 S-

a.

The

 pr

essur

e is st

ill t

oo 

lo

w

Rene

w the fe

ed pump and 

bl

ee

th

e fuel

 s

yst

em

, the

cont

inue

 to

 

trouble

shooting tree

 S-a

.

L - Troubleshooting tree

03:14-01

9

L - Descriptions, low pressure 

check

L1 - Low pressure check

1 Open the test connection on the high 

pressure pump.

2 Pump using the hand pump. Check that 

fuel comes out of the test connection.

3 Turn the engine over using the starter 

motor. Check that fuel comes out of the test 

connection.

4 Close the test connection.

L2 - Checking the suction filter

Note: When renewing the suction filter, check 

the following with the suction filter removed.

1 Pump with the hand pump and check that 

fuel free from air flows out of the hole on 

the inside of the filter housing.

2 If no fuel comes out, check the suction 

strainer and all joints on the suction pipe up 

to the fuel tank armature. Renew the seals 

and check-tighten the connections.

3 If fuel comes out, fit a new filter and bleed 

the fuel system.

L3 - Checking the feed pump

1 Detach the outlet fuel pipe from the feed 

pump. Place a container under the free end 

of the pipe.

2 Turn the engine over using the starter 

motor for about 20 seconds.

The feed pump provides about 1.2 l/min. 

The correct quantity for 20 seconds is 

 

0.3-0.4 litres.

L4 - Checking the feed pump drive

1 Remove the feed pump from the high 

pressure pump bracket.

2 Turn the feed pump by hand. Listen and 

touch.

3 Check that the drive pins in the high 

pressure pump are not damaged.

4 Turn the engine over using the starter 

motor. Check that the feed pump drive in 

the high pressure pump rotates.

L - Descriptions

10

03:14-01

L5 - Checking the high pressure pump 

drive

1 Remove the high pressure pump.
2 Turn the engine over using the starter 

motor. Check that the high pressure pump 

drive rotates in the timing gear.

3 Renew the pump drive gear if it does not 

rotate or is damaged. Check for resulting 

damage to the high pressure pump gear. 

Damaged gears should be renewed.

4 If the pump drive gear in the timing gear 

rotates and is not damaged, check that the 

high pressure pump gear is properly seated 

on the shaft. If the gear is loose, the shaft 

may be damaged. Do not tighten the gear. 

Renew the high pressure pump instead. If 

the gear is jammed, the high pressure pump 

is defective. If this is the case, renew the 

high pressure pump.

L6 - Checking the supply pressure at 

the test connection on the high 

pressure pump

1 Connect pressure gauge 99 362 to the test 

connection on the high pressure pump and 

open the test connection.

2 Turn the engine over using the starter 

motor. Read the pressure after 

approximately 20 seconds. The pressure 

should be more than 3 bar.

3 If the engine starts. Increase the engine 

speed to 1500 rpm. Read the pressure. The 

pressure should be between 9 and 14 bar.

4 Close the test connection and remove the 

pressure gauge.

L - Descriptions

 

 

 

 

 

 

 

содержание   ..  232  233  234  235   ..