Remove/install center exhaust system

AR49.10-P-7283ORB

Remove/install center exhaust system

03.07.2019

Engine

626 in model 205

with code U77 (Diesel Emission control BLUETEC (SCR))

5

Clip

6

Center exhaust system

7

SCR catalytic converter

8

Bolts

9

Elastomer bearing

10

Clip

11

Elastomer bearing

 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

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 

Remove/install

1

Remove center and rear section of lower engine compartment paneling

AR61.20-P-1105LW

 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

2

Open clamp and detach AdBlue® metering valve at center exhaust system (6)

Engine 626 in model 205
with code U77 (Diesel Emission control BLUETEC (SCR))

Notes on use, material properties and handling of AdBlue®

AH14.40-N-0001-01A

 Installation: Install a new seal and clamp.

 Bolt, AdBlue® metering valve clamp to exhaust system

*BA14.40-P-1009-02D

3

Detach SCR catalytic converter temperature sensor on center exhaust system (6)

Engine 626 in model 205
with code U77 (Diesel Emission control BLUETEC (SCR))

AR14.40-P-2011OLP

4

Detach NOx sensor downstream of SCR catalytic converter

Engine 626 in model 205
with code U77 (Diesel Emission control BLUETEC (SCR))

AR14.40-P-2060OLP

5

Open clamp (5)

 Installation: Replace the clamp (5).

 Clamp, front exhaust system to catalytic converter

*BA49.10-P-1003-02B

6

Remove screws/bolts (8)

 Bolt/nut, front exhaust system to bracket

*BA49.10-P-1006-02B

7

Detach center exhaust system (6) on elastomer bearing (11) and secure against falling down

8

Open clamp (10)

 Installation: Replace clamp (10).

 Clamp, rear exhaust system to front exhaust system

*BA49.10-P-1004-02B

9

Pull out center exhaust system (6) to the front and remove

 Aid of helper required.



Check

10

Check elastomer bearing (9) for damage

 Bolt/nut, front exhaust system to bracket

*BA49.10-P-1006-02B

If a problem arises



Replace elastomer bearing (9).

11

Check elastomer bearing (11) for damage

If a problem arises



replace elastomer bearing (11).

12

Remove combustion and corrosion residue at connecting points

13

Install in the reverse order

 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

14

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

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 626 in model 205
with code U77 (Diesel Emission control BLUETEC (SCR))

BA14.40-P-1009-02D

Bolt, AdBlue® metering valve clamp to exhaust system

Nm

11

 Exhaust system

Number

Designation

Engine 626

BA49.10-P-1003-02B

Clamp, front exhaust system to catalytic converter

Nm

20

 Exhaust system

Number

Designation

Engine 626

BA49.10-P-1004-02B

Clamp, rear exhaust system to front exhaust system

Nm

20

 Exhaust system

Number

Designation

Engine 626

BA49.10-P-1006-02B

Bolt/nut, front exhaust system to bracket

Nm

20