18 32 050 Removing and replacing the catalytic converter cylinder 1-4 (N63)

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WARNING: Risk of burning!
Only perform this repair work on an engine that has cooled down.

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

Necessary preliminary tasks:

F03 only:

Remove underbody protection on left and right

Release screws (1).

Remove right cable clip (2).

Fig 1: Identifying Right Cable Clip, Screws

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Release screw (1) on catalytic converter.

Tightening torque 18 32 4AZ .

Release clamp (2) on catalytic converter.

Replace clamp (2).

Tightening torque 18 32 1AZ .

Installation note:

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

Fig 2: Identifying Clamp And Screw On Catalytic Converter

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Installation note:

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

Tightening torque 18 32 1AZ .

Fig 3: Identifying V-Band Clamps

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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 .

Fig 4: Identifying Gap Between Ends Of V-Band Clamps

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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 .

Fig 5: Locating V-Band Clamps Ends

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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 6: Identifying Hose From Cylinder Head Cover And 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 .

Remove catalytic converter for cylinders 1-4.

Fig 7: Identifying Screws On Catalytic Converter

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Installation note:

Picture shows the engine removed.

Replace the seals (1) on the exhaust turbocharger.

Fig 8: Identifying Turbocharger Gaskets

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Installation note:

Picture shows the left side, the procedure for the right side is identical.

Clean sealing surfaces.

Replace gasket (1).

Fig 9: Identifying Gasket

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Assemble engine.

Check exhaust system for leaks.