18 32 050 Removing and installing/renewing cylinder 1-4 catalytic converter (S63)

WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.

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

Necessary preliminary tasks

Remove EXHAUST SYSTEM .
Remove BOTH CONNECTING PIPES .
Remove upper HEAT SHIELD .
Remove both monitor sensors . See 11 78 543 REPLACING RIGHT MONITOR SENSOR (S63) or 11 78 540 REPLACING LEFT MONITOR SENSOR (S63) .

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 .

Fig 1: Identifying Heat Shield, Clamps And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Installation

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 2: Identifying V-Band Clamps Ends Parallel To Each Other

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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 3: Locating 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 4: Locating Ends Of V-Band Clamps Positioned Under Each Other

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

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

Fig 5: 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 6: Identifying Heat Shield Screws

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NOTE: Picture shows the engine removed.

Release screw (1) on right heat shield.

Fig 7: Identifying Heat Shield Screw

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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 8: Identifying Heat Shield Screw

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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 9: 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 10: Identifying Catalytic Converter Screws

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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 11: Identifying Catalytic Converter Screws

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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 12: Identifying Catalytic Converter Cylinders
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Installation:

Picture shows the engine removed.

Replace gaskets (1) on turbocharger.

Fig 13: Identifying Turbocharger Gaskets

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Assemble engine.

Check exhaust system for leaks.