18 32 050 Removing and installing/replacing catalytic exhaust-gas converter, cylinders 1-4 (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 line and lay to one side.

Fig 1: Identifying Holders 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 screws (2) on catalytic converter.

Tightening torque 18 32 4AZ .

Release clamps (3) on catalytic converter.

Replace clamps (3).

Tightening torque 18 32 1AZ .

Installation:

Fig 4: Identifying Heat Shield, Screws And Clamps

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Clamps must be fitted with the screws 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: Identifying Screw On Heat Shields At Bottom Right

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

Release screws (1).

Detach hose (2) from cylinder head cover.

Release screws (3) on holder.

Tightening torque 18 32 2AZ .

Fig 12: Identifying Cylinder Head Cover Hose And Screws

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NOTE: Picture shows the engine removed.

Release screws (1) on catalytic converter, cylinders 1--4, rear, at cylinder head.

Tightening torque 18 32 3AZ .

Fig 13: Identifying Screws On Catalytic Converter, Cylinders 1--4 At Cylinder Head

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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 .

Fig 14: Identifying Screws On Catalytic Converter, Cylinders 5--8 At Cylinder Head

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NOTE: To remove the catalytic converter for cylinders 1--4, it is necessary to remove the catalytic converter for cylinders 5--8.

Remove catalytic converter for cylinders 5--8 (1).
Remove catalytic converter for cylinders 1--4 (2).

Fig 15: Identifying Catalytic Converter Of Cylinders 5--8 And 1--4
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Installation:

Picture shows the engine removed.

Replace gaskets (1) on turbocharger.

Fig 16: Identifying Gasket On Left Turbocharger

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Assemble engine.

Check exhaust system for leaks.