Remove/install NOx sensor with control unit downstream of SCR catalytic converter

AR49.20-D-2062TSV

Remove/install NOx sensor with control unit downstream of SCR catalytic converter

23.05.2018

Engine

642, 651 in model 907

1

Heat shield

4

Control unit

2

Spring disks

5

NOxsensor

3

Electrical connector

6

Electrical wiring harness

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

 Warning

Risk of burn injuries, suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.

Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.

AS49.00-Z-0001-01A

 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

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

 

Remove/install

1

Raise vehicle.

AR00.60-D-1000-04TS

Topical note

Special instructions for lifting and supporting vehicle

AH00.60-N-0100-01TS

2

Remove heat shield (1).

 Installation: Check spring washers (2) for damage.

If spring washers (2) are damaged:



replace damaged spring washers (2).

3

Disconnect electrical connector (3).

4

Remove control unit (4).

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 For this purpose unscrew nuts.

 M6

*BA00.10-N-1002-01A

5

Unclip electrical wiring harness (6).

6

Remove NOx sensor (5) with control unit (4).

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

AH00.00-P-0015-01CW

 The NOx sensor (5) and control unit (4) form a unit.

 Installation: Apply heat-resistant lubricating paste to thread of NOx sensor (5).

 NOx sensor on SCR catalytic converter

*BA49.20-N-1002-03TS

Paste, hot lubrication 1 kg, DBL 6879.20

*BR00.45-Z-1005-06A

 Box wrench bit

*000589710300



Clean

7

Clean sealing surfaces and thread for NOx sensor (5) on SCR catalytic converter.

8

Install in the reverse order

9

Read out fault memory with diagnostic device.

If NOx sensor (5) was replaced.



Connect/disconnect diagnostic unit

AD00.00-D-2000-06TS

If existing faults are shown:



Erase the fault memory.



Check

 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

10

Check exhaust system for leak tightness while engine is running.

 Visual inspection only.

 Headless screws/bolts: screws/bolts and nuts, coarse-pitch thread

Number

Designation

8.8

10.9

BA00.10-N-1002-01A

M6

Galvanized

Nm

9

13

Phosphated

Nm

9

12

 Headless screws/bolts: screws/bolts and nuts, coarse-pitch thread

Number

Designation

12.9

BA00.10-N-1002-01A

M6

Galvanized

Nm

16

Phosphated

Nm

14

 Exhaust aftertreatment

Number

Designation

Model 907 with engine 642

Model 907, 910 with engine 651

BA49.20-N-1002-03TS

NOx sensor on SCR catalytic converter

Nm

60

60

Repair materials

Number

Designation

Order number

BR00.45-Z-1005-06A

Paste, hot lubrication 1 kg, DBL 6879.20

A 000 989 76 51