Removing and installing/replacing catalytic converter cylinders 5-8 (S63B44 T 2) (X6 M)

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

Necessary preliminary tasks:

Remove UPPER HEAT SHIELD .
Remove ENGINE BULKHEAD .
Remove EXHAUST SYSTEM .
Remove VACUUM PUMP .
Remove RIGHT MONITORING SENSOR and LEFT MONITORING SENSOR .
Remove TRAILING LINK on left and right.
Remove REINFORCEMENT PLATE .
Remove TOP LEFT STEERING GEAR COVER .

Removal:

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

Loosen screws (1).

Remove and replace clamps.

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Release screws (1).

Release screw (2).

Bracket remove.

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Release screws (1).

Release screw (2).

Bracket remove.

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

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

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Remove nuts (1) at bottom from holder for catalytic converter cylinders 1-4.

Remove catalytic converter from holder.

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Remove nuts (1) at bottom from holder for catalytic converter cylinders 5-8.

Remove catalytic converter from holder.

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Release screw (1).

Remove transmission oil lines from transmission.

Catch and dispose of escaping transmission oil.

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Remove bolt (1) from holder for transmission oil lines at front.

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Release screw (1).

Release transmission oil lines from holder on engine support arm and place to one side.

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Lift up catalytic converter (1) cylinders 1-4 slightly.

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Unscrew catalytic converter (1) cylinders 1-4 upwards in direction of arrow.

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Lift up catalytic converter (1) cylinders 1-4 slightly.

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Unscrew catalytic converter (1) cylinders 1-4 upwards in direction of arrow.

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Preparation for installation:

Replace seals on exhaust turbocharger.

Installation:

Feed in catalytic converter (1) cylinders 5-8 in direction of arrow and install.

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Feed in catalytic converter (1) cylinders 1-4 in direction of arrow and install.

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Connect catalytic converters (1) and (2) to exhaust turbochargers.

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Parts: Replace clamps (1).

Mount clamps (1).

Installation note:

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

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Mount holder.

Parts: Replace bolts (1).

Tighten down screws (1).

Tightening torque 18 32 2AZ .

Tighten screw (2).

Tightening torque 18 32 4AZ .

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Mount holder.

Parts: Replace bolts (1).

Tighten down screws (1).

Tightening torque 18 32 2AZ .

Tighten screw (2).

Tightening torque 18 32 4AZ .

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Parts: Replace bolts (1).

Tighten bolts (1) on catalytic converter cylinders 1-4 at rear on cylinder head.

Tightening torque 18 32 3AZ .

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Parts: Replace bolts (1).

Tighten bolts (1) on catalytic converter cylinders 5-8 at rear on cylinder head.

Tightening torque 18 32 3AZ .

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Parts: Replace nuts (1).

Mount catalytic converter to holder.

Tighten nuts (1) at bottom from holder for catalytic converter cylinders 1-4.

Tightening torque 18 32 4AZ .

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Parts: Replace nuts (1).

Mount catalytic converter to holder.

Tighten nuts (1) at bottom from holder for catalytic converter cylinders 1-4.

Tightening torque 18 32 4AZ .

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Tighten clamps (1).

Tightening torque 18 32 1AZ .

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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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Parts: Replace gaskets.

Connect transmission oil lines to transmission.

Tighten screw (1).

Tightening torque 17 22 1AZ .

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Fasten transmission oil lines to holder on engine support arm and tighten bolt (1).

Tightening torque 17 22 3AZ .

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Tighten bolt (1) on front holder.

Tightening torque 17 22 3AZ .

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Required follow-up work:

Install HEAT SHIELD at top.
Install VACUUM PUMP .
Install LEFT AND RIGHT TENSION STRUT .
Install ENGINE BULKHEAD .
Install EXHAUST SYSTEM .
Install RIGHT MONITORING SENSOR and LEFT MONITORING SENSOR .
Install REINFORCEMENT PLATE .
Install STEERING GEAR COVER at top left.
Check OIL LEVEL IN AUTOMATIC TRANSMISSION .
Check exhaust system for leaks.