Remove/install metering device of exhaust gas aftertreatment system

AR49.20-G-2002CH

Remove/install metering device of exhaust gas aftertreatment system

05.06.2018

Engine

457.9, 458.9 in model 000.001

with BlueTec

1

Line fitting

6

Line fitting

15

SCR AdBlue® temperature sensor

2

AdBlue® inlet

7

Metering device

16

Heating element

3

Compressed air inlet

8

Compressed-air line

17

SCR AdBlue® metering valve

4

Decoupling sockets

13

SCR compressed-air pressure sensor

5

AdBlue® outlet

14

SCR AdBlue® pressure sensor

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

 Warning

Risk of burn injuries and scalding when working at AdBlue lines and the components attached to them. Risk of injury to skin and eyes when handling AdBlue. Risk of poisoning caused by swallowing AdBlue

Pour AdBlue into suitable containers only. Wait until the pressure is released before starting any work on the exhaust aftertreatment system.

AS14.40-Z-0001-01A

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

Notes on use, material properties and handling of AdBlue®

AH14.40-N-0001-01A



Remove

1

Switch off ignition.

2

Remove injection line.

AR49.20-G-1061CH

3

Remove AdBlue® feed hose from the line fitting (1).


Ensure that no AdBlue® can drip out of the AdBlue® feed hose onto the electrical connectors.
Otherwise, corrosion may occur on the electrical connectors.

4

Remove compressed-air line (8) from the metering device (7).

 Seal bore with a suitable stop plug.

5

Disconnect electrical connectors from the metering device (7).

6

Remove line fitting (1) from the metering device (7).

Only when replacing the metering device (7).

7

Remove metering device (7) with the decoupling sockets (4).



Clean

8

Clean banjo union of the compressed-air line (8) with a lint-free dry cloth.

9

Clean AdBlue® feed hose with a lint-free dry cloth.



Check

10

Check banjo union of the compressed-air line (8) for damage.

If there is a problem,



replace compressed-air line (8).

11

Check AdBlue® feed hose for damage.

If there is a problem,



replace AdBlue® feed hose.



Install

12

Install electrical wiring harness for the heating element (16) of the metering device (7).

Only when installing new metering device (7) and if a metering device (7) without a heating element (16) was installed.

AR49.20-G-2036CH



Metering device for exhaust aftertreatment system modified

BT14.40-W-0002-01A

13

Install metering device (7) with the decoupling sockets (4).

 Metering device on bracket

*BA14.40-N-1005-02H

14

Attach line fitting (1) to the metering device (7).

Only when replacing the metering device (7).

 Replace seal.

 Pipe connection for AdBlue® input to metering device

*BA14.40-N-1034-02H

15

Connect electrical connectors to the metering device (7).

16

Attach compressed-air line (8) to the metering device (7).

 Banjo bolt, compressed air line to metering device

*BA14.40-N-1033-02H

17

Shorten AdBlue® feed hose in the area of the pressure mark of the hose clamp by approx. 2 cm.

Only when reusing the AdBlue® feed hose.

If the overall length of the AdBlue® feed hose is no longer sufficient due to being shortened,



replace AdBlue® feed hose.

18

Attach AdBlue® feed hose to the line fittings (1).

 Replace hose clamp.

19

Install injection line.

AR49.20-G-1061CH

 Replace injection line after each removal.

20

Start engine.

 See information from body manufacturer.

21

Check metering device (7) with the engine running for leak tightness and switch off engine.

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 457.9, 458.9

BA14.40-N-1005-02H

Metering device on bracket

Nm

25

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 457.9, 458.9

BA14.40-N-1033-02H

Banjo bolt, compressed air line to metering device

Nm

15

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 457.9, 458.9

BA14.40-N-1034-02H

Pipe connection for AdBlue® input to metering device

Nm

22