18 32 050 Removing and installing/replacing catalytic converters for cylinders 1 - 4 (N63) (X6 xDrive 50i)

Necessary preliminary tasks: 

• Remove upper HEAT SHIELD .
• Remove the UNITS COMPARTMENT PARTITION WALL .
• Remove EXHAUST SYSTEM .
• Remove VACUUM PUMP .
• Remove the RIGHT MONITORING SENSOR .

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

Screw (1) is located between the catalytic converters.

Tightening torque 18 31 3AZ .

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

Tightening torque 18 31 3AZ .

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Release the screws (1) on the right heat shield.

Tightening torque 18 31 3AZ .

Unclip and remove the right heat shield.

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

Tightening torque 18 31 3AZ .

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Release screw (1) on right left shield.

Tightening torque 18 31 3AZ .

Unclip and remove the heat shield (2) on the left.

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Release screws (1).

Tightening torque 18 32 2AZ .

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Loosen screws (1) on the catalytic converter cylinders 1 - 4 on the back of the cylinder head.

Tightening torque 18 32 3AZ .

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Tightening torque 18 32 3AZ .

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Release screw (1) only.

Tightening torque 18 32 1AZ .

Remove and replace clamp (2) only.

Installation note: 

Clamps must be installed with the screws toward the inside (graphic). Otherwise, a top heat shield can no longer be installed.

Remove catalytic converter for cylinders 1 - 4.

Replace gasket on exhaust turbocharger.

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Installation note: 

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

Tightening torque 18 32 1AZ .

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Installation note: 

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 .

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Installation note: 

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 .

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Assemble engine.

Check exhaust system for leak tightness.