18 32 050 Removing and installing/renewing cylinder 5-8 catalytic converter (S63)

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 screw (2) on catalytic converter.

Tightening torque 18 32 4AZ .

Release clamp (3) on catalytic converter.

Replace clamp (3).

Tightening torque 18 32 1AZ .

Fig 1: Identifying Heat Shield, Clamp And Screw

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Installation: 

Clamp (3) must be fitted with the screw 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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Release screws (1) on left heat shield.

Unclip left heat shield and remove.

Fig 6: Identifying Heat Shield Screws

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Release screw (1) on right heat shield.

Fig 7: Identifying Heat Shield Screw

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

Unclip heat shield and remove.

Fig 8: Identifying Heat Shield Screw

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

Tightening torque 18 32 3AZ .

Remove catalytic converter for cylinders 5-8.

Fig 10: Identifying Catalytic Converter Screws

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Installation: 

Picture shows the engine removed.

Replace gasket (1) on left turbocharger.

Fig 11: Identifying Turbocharger Gaskets

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Assemble engine.

Check exhaust system for leaks.