18 32 050 Removing and installing/replacing catalytic exhaust-gas converter (N63 hybrid)

WARNING: This page is about a different car, the 2011 BMW X6 and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: High-voltage system - danger to life!

WARNING: The following points must be strictly observed prior to starting work:

DE-ENERGIZE THE HIGH-VOLTAGE SYSTEM
Observe SAFETY INSTRUCTIONS for handling with hybrid vehicles

WARNING: Scalding hazard!
Only perform these tasks on an engine that has cooled down.

Necessary preliminary tasks:

REMOVE HEAT SHIELD
Remove BOTH INTAKE FILTER HOUSINGS
Remove EXHAUST SYSTEM
Remove BOTH CONNECTING PIPES
Remove both control sensors. See LEFT CONTROL SENSOR and RIGHT CONTROL SENSOR .
Remove both monitor sensors. See LEFT MONITOR SENSOR and RIGHT MONITOR SENSOR .

Unscrew nuts (1).

Tightening torque 18 32 5AZ .

Release holders (2) and (3) for high-voltage lines and lay to the side.

Fig 1: Identifying Holder And Nuts

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Picture shows the left side, carry out the operation for the right side in an identical way.

Release screws (1).

Remove cable holders on left and right.

Fig 2: Identifying Cable Holders And Screws

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Remove rubber mounts (1) and release screws underneath.

Tightening torque 13 71 5AZ .

Remove cable holder (2).

Remove HEAT SHIELD (3) at top.

Fig 3: Identifying Rubber Mounts, Cable Holder And Heat Shield

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Remove heat shield (1) at rear left and right.

This is described further below in the instruction.

Release screw (2) on catalytic converter.

Tightening torque 18 32 4AZ .

Release clamp (3) on catalytic converter.

Replace clamp (3).

Tightening torque 18 32 1AZ .

Fig 4: Identifying Heat Shield, Screws And Clamps

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Installation:

Clamp (3) must be fitted with the screw pointing inwards (shown in picture). Otherwise it will not be possible to install the heat shield at the top.

Installation:

The ends of the V-band clamps must rest parallel to each other.

Tightening torque 18 32 1AZ .

Fig 5: Identifying V-Band Clamp

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Installation:

If you can see a gap between the ends of the V-band clamps, release and then repeat the screw connection.

Tightening torque 18 32 1AZ .

Fig 6: Identifying Gap Between Ends Of V-Band Clamps

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Installation:

If the ends of the V-band clamps are positioned under each other, release and then repeat the screw connection.

Tightening torque 18 32 1AZ .

Fig 7: Locating V-Band Clamps Position

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Release screw (1) from heat shields (2) and (3).

Screw (1) is located between catalytic exhaust-gas converters.

Fig 8: Identifying Heat Shields And Screws

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NOTE: Picture shows the engine removed.

Release screws (1) on left heat shield.

Unclip left heat shield and remove.

Fig 9: Removing Left Heat Shield With Screws

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NOTE: Picture shows the engine removed.

Release screw (1) on right heat shield.

Fig 10: Identifying Screw On Right Heat Shield

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NOTE: Picture shows the engine removed.

Release screw (1) on heat shield at bottom right.

Unclip heat shield and remove.

Fig 11: Removing Heat Shield With Screw

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Release screws (1).

Detach hose (2) from cylinder head cover.

Release screws (3) on holder.

Tightening torque 18 32 2AZ .

Fig 12: Identifying Hose On Cylinder Head Cover And Screws On Holder

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NOTE: Picture shows the engine removed.

Release screws (1) on catalytic converter, cylinders 5--8, rear, at cylinder head.

Tightening torque 18 32 3AZ .

Remove catalytic converter for cylinders 5-8.

Fig 13: Identifying Screws On Catalytic Converter, Cylinders 5--8 At Cylinder Head

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Installation:

Picture shows the engine removed.

Replace gasket (1) on left turbocharger.

Fig 14: Identifying Gasket On Left Turbocharger

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Assemble engine.

Check exhaust system for leaks.