Remove/install exhaust system

AR49.10-P-7142MRC

Remove/install exhaust system

13.03.2018

Engine

274.9 in model 238

Shown on model 238 without code U21 (AMG Performance exhaust system)

1

Catalytic converter

4

Exhaust system

2

Clip

5

Elastomer bearing

3

Bracket

6

Elastomer bearing

Shown on model 238 with code U21 (AMG Performance exhaust system)

1

Catalytic converter

5

Elastomer bearing

2

Clip

6

Elastomer bearing

3

Bracket

7

Exhaust flap

4

Exhaust system

 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

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

 

Remove/install

1

Remove center and rear lower engine compartment paneling

AR61.20-P-1105LWE

 Installation: Only install center and rear lower rear engine compartment paneling again after leak test.

2

Remove the left and right underfloor paneling

AR61.30-P-1001LWE

3

Remove rear diagonal struts

Engine 274.9 in model 238.4

AR61.10-P-5142LWP

4

Remove rear reinforcement

 Bolt, rear reinforcement to frame floor assembly

*BA61.10-P-1004-01L

5

Remove temperature sensor for NOx storage catalytic converter from exhaust system (4)

Engine 274.9 in model 238
with code 920 (Direct petrol injection with stratified charging)

AR07.70-P-0006MRD

6

Remove NOx sensor from exhaust system (4)

Engine 274.9 in model 238
with code 920 (Direct petrol injection with stratified charging)

AR07.70-P-0001MRD

7

Release and disconnect electrical connection at exhaust flap (7)

Engine 274.9 in model 238
with code U21 (AMG Performance exhaust system)

8

Support exhaust system (4)



000 588 10 62 00 Support plate

WS26.00-P-3309B



000 588 11 62 00 Major assembly mount

WS01.00-P-0092B

9

Remove clamp (2)

 Installation: Replace clamp (2).

 Clamp to catalytic converter and front exhaust system

*BA49.10-P-1002-02I

10

Unscrew nut of decoupling element from holder (3)

 Bolt, bracket for decoupling element to body/exhaust system at front

*BA49.10-P-1008-02I

11

Remove elastomer bearings (5, 6) from exhaust system (4)

12

Remove exhaust system (4)

 Aid of helper required.



Check

13

Check the elastomer bearing (5, 6) and decoupling element for damage and wear and replace if necessary

 Bolt, bracket for decoupling element to body/exhaust system at front

*BA49.10-P-1008-02I



Clean

14

Remove combustion and corrosion residues on the connecting points from CAT (1) and exhaust system (4)

15

Install in the reverse order

16

Check installation position and unobstructed movement of exhaust system (4) and correct if necessary

 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

17

Carry out an engine test run and check exhaust system for leaktightness

18

Install center and lower engine compartment paneling

AR61.20-P-1105LWE

 Exhaust system

Number

Designation

Model 238 with engine 274

BA49.10-P-1002-02I

Clamp to catalytic converter and front exhaust system

Nm

22

 Exhaust system

Number

Designation

Model 238 with engine 274

BA49.10-P-1008-02I

Bolt, bracket for decoupling element to body/exhaust system at front

M8

Nm

20

 Frame floor assembly

Number

Designation

Model 238

BA61.10-P-1004-01L

Bolt, rear reinforcement to frame floor assembly

Nm

24