Removing and Installing (Main) Catalytic Converter
Removing And Installing (main) Catalytic Converter
Preliminary work
1. Remove the engine guard.
2. Lift the vehicle.
Removing (main) catalytic converter
Removing (main) catalytic converter, cylinder bank 1 - 4
ATTENTION:
Danger of burns from hot exhaust system
- Do not remove the exhaust system until it has cooled down.
- Wear protective gloves.
NOTE:
- Cover the right wing and guide through a ratchet from above using several extensions in order to loosen the top nut between the primary and main catalytic converters.
- If the working height of the vehicle has to be changed due to further work, the transmission support must be re-fitted using the old bolts.
Cayenne Turbo (M48/50)
Cayenne S (M48/00)
1. Remove transverse strut. Undo screws (including the centre ones) -arrows-.
2. Release connecting clamps between catalytic converters and exhaust system. Then push the clamps backwards onto the exhaust system. The exhaust clamps must not be reused.
3. Release the catalytic converter mounts from the body and cross member (two screws each).
4. Remove cardan shaft between front-wheel drive and transfer box.
5. Support transmission with transmission jack. Let main catalytic converter hang down. Unscrew the three nuts connecting the primary and main catalytic converters. Remove main catalytic converter. Remove flange gasket.
6. Re-fit transmission support using old screws so that the transmission jack can be removed from under the vehicle.
Removing (main) catalytic converter, cylinder bank 5 - 8
ATTENTION:
Danger of burns from hot exhaust system
- Do not remove the exhaust system until it has cooled down.
- Wear protective gloves.
Cayenne Turbo (M48/50)
Cayenne S (M48/00)
1. Remove transverse strut. Undo the screws -arrows- (do not forget the centre screw).
2. Release connecting clamps between catalytic converters and exhaust system. Then push the clamps backwards onto the exhaust system. The exhaust clamps must not be reused.
3. Release the catalytic converter mounts from the body and cross member (two screws each).
4. Unscrew the three nuts connecting the primary and main catalytic converters and guide out the main catalytic converter. Remove flange gasket.
Installing (main) catalytic converter
Installing (main) catalytic converter, cylinder bank 1 - 4
1. Transmission support removed and transmission supported with jack.
NOTE: Gaskets and self-locking nuts and bolts must always be replaced.
2. Push new exhaust clamp onto exhaust pipe.
3. Ensure sealing faces of exhaust system are clean.
4. Replace flange gasket and push over the studs of the main catalytic converter.
5. Put main catalytic converter in the installation position and fit new nuts and bolts.
6. Tighten nuts connecting primary and main catalytic converters to the specified tightening torque. Tightening torque: 17 ftlb.
NOTE: To fit the cardan shaft, the transmission must be supported again and the transmission support removed. Then fit the transmission support with new screws.
7. Re-install cardan shaft between front-wheel drive and transfer box. Make sure that the main catalytic converter is also positioned with the cardan shaft over the transmission support.
8. Tighten screws of the catalytic converters to the body and cross member with tightening torque. Tightening torque: 17 ftlb.
9. Fit exhaust clamps.
10. Install transverse strut. Tighten the screws -arrows- (do not forget the centre screw). Tightening torque: 7.5 ftlb.
Installing (main) catalytic converter, cylinder bank 5 - 8
1. Push new exhaust clamp onto exhaust pipe.
2. Ensure sealing faces of exhaust system are clean.
3. Replace flange gasket and push over the studs of the main catalytic converter.
4. Put main catalytic converter in the installation position and fit new nuts and bolts.
5. Tighten nuts connecting primary and main catalytic converters to the specified tightening torque. Tightening torque: 17 ftlb.
6. Tighten screws of the catalytic converters to the body and cross member with tightening torque. Tightening torque: 17 ftlb.
7. Fit exhaust clamps.
8. Install transverse strut. Tighten the screws -arrows- (do not forget the centre screw). Tightening torque: 7.5 ftlb.
Subsequent work
1. Fit engine guard.