Remove/install catalytic converter

AR49.10-P-5500MT

Remove/install catalytic converter

07.09.2018

Engine

270 in model 117, 176, 242, 246

Shows model 246

1

Engine cover

2

Air filter box

3

Fan unit

4

Bracket

4s

Screw/bolts

5

Catalytic converter

6

Heat shield

7

Nuts

G3/2

Oxygen sensor upstream of catalytic converter

Illustration shows model 246.2

5

Catalytic converter

8

Radiator support

9

Pipe clamp

10

Exhaust system

11

Bracket

11s

Screw/bolt

12

Screw/bolts

5

Catalytic converter

13

Heat shield

G3/1

Oxygen sensor downstream of catalytic converter

 

Remove/install

 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 self-locking nuts and bolts

AH00.00-N-0001-01A

 Warning

Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.

No parts of the body or limbs should be within the operating area when the components are moving.

AS00.00-Z-0011-01A

1

Open engine hood and secure against falling down

2

Lift vehicle on vehicle lift

AR00.60-P-1000AK

3

Remove engine cover (1)

4

Remove air filter box (2)

AR09.10-P-1150MT

5

Remove fan unit (3)

AR20.40-P-5050NKB

6

Remove oxygen sensor upstream of catalytic converter (G3/2)

AR07.52-P-5303MT

7

Remove screw/bolts (4s) and detach bracket (4) from catalytic converter (5) on cylinder head

 Bolt, front exhaust system holder to front exhaust system/cylinder head

*BA49.10-P-1002-01AL

8

Detach heat shield (6) over turbocharger

9

Unscrew nuts (7) from catalytic converter (5) at turbocharger

 Installation: Replace nuts (7).

 Check threaded stud; replace if necessary.

 Nut/bolt, exhaust system at front to turbocharger

*BA49.10-P-1001-01AL

10

Attach guard plate and secure cooler against falling down



WF58.50-P-0110-01A

11

Detach lower engine compartment paneling

AR61.20-P-1105NKB

12

Remove radiator support (8)

 Bolt, connecting carrier to front axle carrier

*BA62.30-P-1004-04D

 Bolt, radiator support to longitudinal member

*BA62.30-P-1001-04D

13

Unclip electrical connection for oxygen sensor downstream of catalytic converter (G3/1) on bracket and disconnect electrical connection

AR07.52-P-5303MT

14

Unfasten pipe clamp (9) at connection between catalytic converter (5) on exhaust system (10)

 Installation: Replace pipe clamp (9).

 Clamp, center muffler or diesel particulate filter/clamp, rear muffler to center muffler or diesel particulate filter/gasoline particulate filter to front exhaust system

*BA49.10-P-1005-01AL

15

Remove screw/bolt (11s) for catalytic converter (5) at bracket (11)

 Bolt, front exhaust system holder to front exhaust system/oil pan

*BA49.10-P-1003-01AL

16

Remove screw/bolts (12) from catalytic converter (5) at crankcase

 Bolt, front exhaust system holder to front exhaust system/crankcase

*BA49.10-P-1004-01AL

17

Detach two-piece heat shield on catalytic converter (5)

For vehicles with a dual clutch transmission

18

Take out catalytic converter (5)

 Installation: Replace seal between catalytic converter (5) and turbocharger as well as seal between catalytic converter (5) and center muffler.

19

Detach heat shield (13) on catalytic converter (5)

When replacing the catalytic converter (5) for vehicles with a manual transmission

20

Remove rear heat shield from steering gear

MODEL 242

AR46.20-P-0602NKB

21

Remove oxygen sensor downstream of catalytic converter (G3/1)

When replacing catalytic converter (5)

AR07.52-P-5303MT

22

Install in the reverse order



Check

23

Check installation position and clearance of exhaust system

 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

24

Test run engine and check exhaust system for leaks

 Exhaust system

Number

Designation

Engine 270 in model 117

Engine 270 in model 176

BA49.10-P-1001-01AL

Nut/bolt, exhaust system at front to turbocharger

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 242

Engine 270 in model 246

BA49.10-P-1001-01AL

Nut/bolt, exhaust system at front to turbocharger

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 117

Engine 270 in model 176

BA49.10-P-1002-01AL

Bolt, front exhaust system holder to front exhaust system/cylinder head

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 242

Engine 270 in model 246

BA49.10-P-1002-01AL

Bolt, front exhaust system holder to front exhaust system/cylinder head

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 117

Engine 270 in model 176

BA49.10-P-1003-01AL

Bolt, front exhaust system holder to front exhaust system/oil pan

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 242

Engine 270 in model 246

BA49.10-P-1003-01AL

Bolt, front exhaust system holder to front exhaust system/oil pan

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 117

Engine 270 in model 176

BA49.10-P-1004-01AL

Bolt, front exhaust system holder to front exhaust system/crankcase

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 242

Engine 270 in model 246

BA49.10-P-1004-01AL

Bolt, front exhaust system holder to front exhaust system/crankcase

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 117

Engine 270 in model 176

BA49.10-P-1005-01AL

Clamp, center muffler or diesel particulate filter/clamp, rear muffler to center muffler or diesel particulate filter/gasoline particulate filter to front exhaust system

Nm

25

25

 Exhaust system

Number

Designation

Engine 270 in model 242

Engine 270 in model 246

BA49.10-P-1005-01AL

Clamp, center muffler or diesel particulate filter/clamp, rear muffler to center muffler or diesel particulate filter/gasoline particulate filter to front exhaust system

Nm

25

25

 Radiator support

Number

Designation

Model 117, 176, 246

Model 242

BA62.30-P-1001-04D

Bolt, radiator support to longitudinal member

Nm

20

20

 Radiator support

Number

Designation

Model 117, 176, 246

Model 242

BA62.30-P-1004-04D

Bolt, connecting carrier to front axle carrier

Nm

16

16