18 12 040 Replacing front silencer (N52)

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Special tools required:

31 2 220

WARNING: Risk of burning!
Only perform these tasks on an engine that has cooled down.

Support front silencer with special tool 31 2 220.

Fig 1: Supporting Exhaust System Using Special Tool (31 2 220)

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NOTE: If the cutting line is not marked by a punch mark in the pipe, determine the cutting line by means of the pipe length on the new front silencer.

Carry over cutting line to faulty front silencer and mark.

Cut through exhaust pipes at marked point with a suitable tool.

Fig 2: Identifying Cutting Line Mark On Rear Silencer

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Unscrew nuts (1).

Tightening torque 18 31 1AZ .

Remove connecting plate (2).

Installation note:

Replace self-locking nuts.

Replace seal.

Fig 3: Identifying Connecting Plate And Nuts

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Unscrew screws (1) and (2).

Tightening torque 18 20 1AZ .

Fig 4: Identifying Exhaust System Screws

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Release screws (1).

Tightening torque 18 31 2AZ .

Only if independent heating fitted.

Release screw (2) on metering pump.

Tightening torque 18 31 3AZ .

Release screws (3) on underbody panels.

Remove reinforcement plate (4).

Lower and remove front silencer with assistance of a second person.

Fig 5: Identifying Reinforcement Plate And Screws

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Installation note:

Align front silencer to rear silencer and connect with clamp.

Center clamp and tighten down.

Tightening torque 18 31 4AZ .

Fig 6: Identifying Front Silencer Center Clamps

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NOTE: Check exhaust system for leaks.