Catalytic Converter: Service and Repair
WM 267619 Removing and installing primary catalytic converter (Turbo)
Technical values
Preliminary work
1. Move front lid to service position. -> 552213 Securing lid (service position) Procedures
2. Remove front wheels. -> 440519 Removing and installing wheel Removal and Replacement.
3. Remove front underbody panelling -> 519219 Removing and installing cover for front underbody - section on "Removing" 519219 Removing and installing Cover For Front Underbody.
4. Remove supporting plate -> 400819 Removing and installing front-axle support - section on "Removing" 400819 Removing and installing front-axle support.
Removing primary catalytic converter
Removing primary catalytic converter on right side
CAUTION
Hot components
- Risk of burns
-> Let hot components cool down.
-> Wear personal protective gear.
CAUTION
Heavy components
- Risk of squashing
-> Wear personal protective gear.
-> Get someone to help if necessary.
Component overview
1. Detach engine wire harness from the bulkhead on the right side. For details, see partial work in scope -> 508119 Removing and installing cross panel (disassembling plenum panel) - section on "Removing" Service and Repair.
1.1. Detach cowl panel cover on the right side.
1.2. Lift engine wire harness out of the bulkhead on the right side.
2. Remove electric plug-in connectors -1- from the oxygen sensors.
Pulling off connectors
3. Check that the cables are routed correctly => Cable routing !
Cable routing
4. Unclip cable on the right cylinder bank.
5. Raise the vehicle -> 4X00IN Lifting the vehicle Service and Repair.
6. Unclip cable at the transmission housing.
7. Pull oxygen sensor cables downwards.
7.1. Fasten the cables to a suitable cord so that you can pull them up again during installation.
7.2. Pull the cables down past the vacuum pump.
8. Loosen clamping sleeves -1- for the exhaust pipe.
Loosening clamps
8.1. Loosen clamping screws -2-.
8.2. Slide clamping sleeves towards the rear -arrow-.
9. Screw off fastening nut -1- on the bottom holder -2-.
Mounting for bottom holder
10. Unscrew fastening screw -1- on top holder -2-.
Top holder
Information
- Access to the fastening nuts between the heat shield on the all-wheel drive at the front and the turbocharger is very tight.
- Use a narrow tool (sockets, extensions). Use jointed sockets if necessary.
11. Screw off fastening nuts on studs -3-.
12. Remove primary catalytic converter.
Removing primary catalytic converter on left side
Component overview
1. Remove electric plug-in connectors -1- from the oxygen sensors.
Pulling off connectors
2. Check that the cables are routed correctly => Oxygen sensor cable routing !
Oxygen sensor cable routing
3. Unclip cable on the left cylinder bank.
4. Raise the vehicle -> 4X00IN Lifting the vehicle Service and Repair.
5. Remove heat shield -1- at the universal joint on the steering column.
Heat shield
5.1. Unscrew fastening screws -2-.
5.2. Remove heat shield -1-.
6. On vehicles with Servotronic: Pull off connector -3-.
Removing universal joint
7. Remove universal joint -1-.
7.1. Loosen clamping screw -2-.
7.2. Slide universal joint -1- and lower part of steering column upwards -arrow-.
8. Unclip cable at the transmission housing.
9. Pull oxygen sensor cables downwards.
9.1. Fasten the cables to a suitable cord so that you can pull them up again during installation.
9.2. Pull the cables down past the high-pressure pump.
10. Loosen clamping sleeves -1- for the exhaust pipe.
Loosening clamps
10.1. Loosen clamping screws -2-.
10.2. Slide clamping sleeves towards the rear -arrow-.
11. Screw off fastening nut -1- on the bottom holder -2-.
Mounting for bottom holder
12. Unscrew fastening screw -1- on top holder -2-.
Top holder
13. Screw off fastening nuts on studs -3-.
14. Remove primary catalytic converter.
Installing primary catalytic converter
Installing primary catalytic converter on right side
Information
- The primary catalytic converters are installed in reverse order to removal.
- The fastening nuts on the studs for the manifold must be tightened crosswise.
1. Replace fastening nuts between the primary catalytic converters and exhaust manifolds and replace seals.
2. Use new clamping sleeves and move them into installation position at the same time.
3. Tighten all fastening screws and nuts to => Tightening torque: 23 Nm (17 ftlb.).
Installing primary catalytic converter on left side
Information
- The primary catalytic converters are installed in reverse order to removal.
- The fastening nuts on the studs for the manifold must be tightened crosswise.
1. Replace fastening nuts between the primary catalytic converters and exhaust manifolds and replace seals.
2. Use new clamping sleeves and move them into installation position at the same time.
3. Tighten all fastening screws and nuts to => Tightening torque: 23 Nm (17 ftlb.).
Subsequent work
1. Install supporting plate -> 400819 Removing and installing front-axle support - section on "Installing" 400819 Removing and installing front-axle support.
2. Install front underbody panelling. -> 519219 Removing and installing cover for front underbody - section on "Installing" 519219 Removing and installing Cover For Front Underbody
3. Fit the front wheels -> 440519 Removing and installing wheel - section on "Installing" Removal and Replacement.