Remove/install catalytic converter

AR49.10-P-5500MLJ

Remove/install catalytic converter

24.07.2015

Engine

157, 278 in model 166

Engine

157, 278 in model 292

Shown on model 166, 292 with engine 278

1

Oxygen sensor

8

Mounting clamp

2

Oxygen sensor

9

Center exhaust system

3

Oxygen sensor

10

Mounting clamp

4

Oxygen sensor

11

Mounting clamp

5

Catalytic converter

12

Rear muffler

6

Catalytic converter

13

Decoupling elements

7

Mounting clamp

 Danger !

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

 Danger !

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



Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A



Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 

Remove/install

1

Remove rear underfloor paneling

AR61.30-P-1001GQ

 Installation: Only install underfloor paneling after the engine test run and leak test.

2

Disconnect electrical connection of the respective oxygen sensor (1, 2, 3, 4) and expose lines

AR07.04-P-0021MLJ

3

Remove rear engine crossmember

Engine 157 in model 166
Engine 278 in model 166

AR22.10-P-1180GQ

4

Secure center exhaust system (9) against falling down

5

Detach decoupling elements (13) from the center exhaust system (9)

6

Unfasten clamps (7, 8) of left catalytic converter (6) or right catalytic converter (5)

 Engine 157, 278 in model 166
Engine 157, 278 in model 292Bolt, exhaust system clamp to catalytic converter

*BA49.10-P-1012-01AK

7

Lower center exhaust system (9) until the left catalytic converter (6) and right catalytic converter (5) are free

 Removal: Ensure that the end pieces of the rear muffler (12) do not touch the bumper.

8

Remove left (6) or right CAT (5)

 Engine 157, 278 in model 166
Engine 157, 278 in model 292Bolt, catalytic converter flange to exhaust line

*BA49.10-P-1015-01AK



Clean

9

Remove combustion and corrosion residue at separating points



Check

10

Check decoupling elements (13)

 Check for wear and damage, and replace if necessary.

11

Install in the reverse order



Check

12

Check installation position and unobstructed movement of all components of the exhaust system

 Danger !

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

13

Perform an engine test run and check exhaust system for leaktightness

 Exhaust system

Number

Designation

Engine 157, 278 in model 166

Engine 157, 278 in model 292

BA49.10-P-1012-01AK

Bolt, exhaust system clamp to catalytic converter

Nm

35

35

 Exhaust system

Number

Designation

Engine 157, 278 in model 166

Engine 157, 278 in model 292

BA49.10-P-1015-01AK

Bolt, catalytic converter flange to exhaust line

Nm

20

20