Remove/install metering device of exhaust gas aftertreatment system

AR49.20-G-2002DD

Remove/install metering device of exhaust gas aftertreatment system

14.08.2019

Engine

900.92, 902.93, 924.93, 926.95/97 in model 000.001

with BlueTec

Engine

925.9 in model 000.001

with BlueTec

1

Line fitting (AdBlue® inlet)

8

Compressed-air line

2

AdBlue® inlet

9

Compressed-air connector

3

Compressed-air inlet

10

AdBlue® feed hose

4

Decoupling sockets

11

SCR AdBlue® metering valve

5

AdBlue® air mixture outlet

12

SCR compressed air pressure sensor

6

Line fitting (AdBlue® air mixture outlet)

13

SCR AdBlue® temperature sensor

7

Metering device

14

SCR AdBlue® pressure sensor

7

Metering device

15

Electrical wiring harness

A

Passage grommet

 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/install

1

Switch off ignition.

2

Remove injection line.

AR49.20-G-1061DD

 Replace injection line after each removal.

3

Disconnect electrical connectors from the metering device (7).

 Installation:
Fix in place electrical wiring harness (15) with cable ties. Feed-through grommets (A) of electrical connectors at metering device (7) must be angled by more than 90°.
Damage due to water inlet can otherwise arise.

4

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

 Seal bores with suitable stop plugs.

 Installation: Before installation, check compressed air connector (9) of compressed-air line (8) for presence of foreign objects, contamination and damage.

 Compressed air connection system SCHÄFER "SDF" in metallic material

*BA00.18-N-1003-01C

5

Remove AdBlue® feed hose (10) at line fitting (1) and push to side.

 Collect escaping AdBlue® with suitable container.

 Installation: Before installation, check AdBlue® feed hose (10) for presence of foreign objects, contamination and damage.

If AdBlue® feed hose (10) is damaged,



replace AdBlue® feed hose (10).

6

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

Only if metering device (7) is replaced.

 Pipe connection for AdBlue® input to metering device

*BA14.40-N-1034-02H

7

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

 Installation: Before installation, check metering device (7) for presence of foreign objects, contamination and damage. Check isolating sleeves (4).

 Metering device on bracket

*BA14.40-N-1005-02H

If damage is present:



Replace metering device (7) with isolating sleeves (4).

8

Install in the reverse order



Check

9

Start engine and fill compressed-air system up to shutoff pressure.

 See information from body manufacturer.

10

Check metering device (7) when the engine is running for leaks.

 Visual inspection.

11

Switch off engine.

 Compressed air lines

Number

Designation

Model 000.001

BA00.18-N-1003-01C

Compressed air connection system SCHÄFER "SDF" in metallic material

M10x1

Nm

5

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 900.92, 902.93, 924.93, 925.9, 926.9 in model 000.001

BA14.40-N-1005-02H

Metering device on bracket

Nm

25

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 900.92, 902.93, 924.93, 925.9, 926.9 in model 000.001

BA14.40-N-1034-02H

Pipe connection for AdBlue® input to metering device

Nm

22