Remove/install exhaust aftertreatment unit

AR49.20-P-1500MFE

Remove/install exhaust aftertreatment unit

28.10.2019

Engine

608 in model 118, 177, 247

1

Exhaust aftertreatment unit

5

Bracket

B175

Temperature sensors sensor unit

2

Bracket

6

Bolts

N37/7b1

NOx sensor upstream of SCR catalytic converter

2m

Nut

17

Additive line

Y129

AdBlue® metering valve

2s

Screw

B19/9

Temperature sensor upstream of diesel particulate filter

1

Exhaust aftertreatment unit

7

Clip

12

Bracket

3

Heat shield

8

Bracket

13

Screw

4

Bracket

9

Bolts

14

Coolant line

4m

Nuts

10

Clip

15

Screw

4s

Bolts

11

Bolts

16

Screw

 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

 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

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Notes on safety-relevant components

AH00.00-Z-0019-01A

 

Remove/install

1

Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).

2

Remove upper engine cover.



AP01.10-P-2405-01B

 Installation: Only install upper engine cover after the leak test.

3

Remove air filter housing.

AR09.10-P-1150MFE

4

Remove engine air intake duct downstream of air filter.

AR09.10-P-8130MFE

5

Remove charge air pipe upstream of liquid-cooled charge air cooler.

AR09.41-P-1231MFE

6

Remove on-board electrical system battery (G1) with the battery carrier.

AR54.10-P-0028MFA

7

Remove front right wheel and tire assembly.

AR40.10-P-1102MFA

8

Remove fender liner in right front fender.

AR88.10-P-1301MFA

9

Remove mixer housing.

AR09.20-P-1320MFE

10

Remove heat shield at firewall.

AR49.10-P-0001MFE

11

Remove DPF differential pressure sensor (B28/8).

AR07.04-P-0025MFE

12

Remove low-pressure exhaust gas recirculation temperature sensor (B157/2).

AR07.04-P-0125MFE

13

Remove exhaust gas recirculation cooler.

AR14.20-P-7665MFE

14

Remove screws (6) and place bracket (5) with connected wiring harness to one side.


Do not crush or kink or subject lines to tension.
This would lead to damage to the lines and can impair their function.

 Bolt, holder for differential pressure sensor to exhaust gas turbocharger

*BA07.04-P-1006-02C

15

Unscrew nut (2m), remove screw (2s) and remove bracket (2) together with temperature sensor control unit (B175) from cylinder head and exhaust system.

 Nut/bolt, front exhaust system bracket to exhaust system/cylinder head/crankcase

*BA49.10-P-1002-02R

16

Unclip electric lines of temperature sensor control unit (B175) at heat shield (3) and secure temperature sensor control unit (B175) with connected lines at rear in engine compartment so that free of tension.


Do not crush or kink or subject lines to tension.
This would lead to damage to the lines and can impair their function.

17

Release and disconnect electrical connector at AdBlue® metering valve (Y129).

18

Remove AdBlue® metering valve (Y129) from exhaust gas aftertreatment unit (1) and place to one side with connected lines.

AR49.20-P-2000MFE


Do not crush or kink or subject lines to tension.
This would lead to damage to the lines and can impair their function.

 Installation: Check that clipped connections of additive line (17) are correctly seated.

19

Remove temperature sensor upstream of diesel particulate filter (B19/9) from exhaust gas aftertreatment unit (1) and place to one side with connected line.

AR49.20-P-0125MFE


Do not crush or kink or subject lines to tension.
This would lead to damage to the lines and can impair their function.

20

Remove heat shield (3) at exhaust gas turbocharger.

AR09.40-P-6020-03MFE

 Bolt, heat shield for exhaust gas turbocharger to holder/cylinder head cover

*BA09.40-P-1001-02F

21

Release clamp (7) between exhaust gas turbocharger and exhaust gas aftertreatment unit (1) and slide onto exhaust gas turbocharger.

 Clamp, front exhaust system to turbocharger

*BA49.10-P-1001-02R

22

Remove NOx sensor upstream of SCR catalytic converter (N37/7b1) from exhaust gas aftertreatment unit (1), unclip connected line from bracket (4) and secure with connected line so that free of tension.

AR49.20-P-2063MFE


Do not crush or kink or subject lines to tension.
This would lead to damage to the lines and can impair their function.

23

Remove remaining sensors of temperature sensor control unit (B175) and remove entire temperature sensor control unit (B175) with bracket (2) of exhaust system.

AR49.20-P-0015MFE

24

Remove screws (9) and remove bracket (8).

 Nut/bolt, front exhaust system bracket to exhaust system/cylinder head/crankcase

*BA49.10-P-1002-02R

25

Release clamp (10) and slide onto center exhaust system.

 Clamp, center exhaust system to front exhaust system

*BA49.10-P-1003-02R

26

Remove screw (15) of coolant line (14) at bracket (4).

 Screw, coolant line to oil pan/exhaust system holder

*BA20.20-P-1005-02C

27

Remove screw (13) of coolant line (14) and place coolant line (14) to one side.

 Screw, coolant line to oil pan/exhaust system holder

*BA20.20-P-1005-02C

28

Remove screws (11) and remove bracket (12).

 Nut/bolt, front exhaust system bracket to exhaust system/cylinder head/crankcase

*BA49.10-P-1002-02R

29

Secure exhaust gas aftertreatment unit (1) with suitable means against falling down.

30

Remove nuts (4m) and remove screws (4s).

 Nut/bolt, front exhaust system bracket to exhaust system/cylinder head/crankcase

*BA49.10-P-1002-02R

31

Remove bracket (4).

32

Remove screw (16) and remove exhaust gas aftertreatment unit (1).

 Aid of helper required.

 Nut/bolt, front exhaust system bracket to exhaust system/cylinder head/crankcase

*BA49.10-P-1002-02R

33

Remove clamps (7, 10).

 Installation: Replace clamps (7, 10).

34

Install in the reverse order.



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

35

Perform engine test run; in this connection, check exhaust system for proper operation and leak tightness.

 Sensors

Number

Designation

Engine 608

BA07.04-P-1006-02C

Bolt, holder for differential pressure sensor to exhaust gas turbocharger

Nm

10

 Turbocharger

Number

Designation

Engine 608

BA09.40-P-1001-02F

Bolt, heat shield for exhaust gas turbocharger to holder/cylinder head cover

Nm

10

 Engine radiator, coolant hoses and lines

Number

Designation

Engine 608

BA20.20-P-1005-02C

Screw, coolant line to oil pan/exhaust system holder

M6

Nm

10

 Exhaust system

Number

Designation

Model 247 with engine 608

Model 118 with engine 608

BA49.10-P-1001-02R

Clamp, front exhaust system to turbocharger

Nm

21

21

 Exhaust system

Number

Designation

Model 177 with engine 608

BA49.10-P-1001-02R

Clamp, front exhaust system to turbocharger

Nm

21

 Exhaust system

Number

Designation

Model 247 with engine 608

Model 118 with engine 608

BA49.10-P-1002-02R

Nut/bolt, front exhaust system bracket to exhaust system/cylinder head/crankcase

Nm

25

25

 Exhaust system

Number

Designation

Model 177 with engine 608

BA49.10-P-1002-02R

Nut/bolt, front exhaust system bracket to exhaust system/cylinder head/crankcase

Nm

25

 Exhaust system

Number

Designation

Model 247 with engine 608

Model 118 with engine 608

BA49.10-P-1003-02R

Clamp, center exhaust system to front exhaust system

Nm

21

21

 Exhaust system

Number

Designation

Model 177 with engine 608

BA49.10-P-1003-02R

Clamp, center exhaust system to front exhaust system

Nm

21