18 12 046 Replacing front silencer (N20)

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Special tools required:

31 2 220

WARNING: Risk of burning!
Only perform this repair work after the exhaust system has cooled down.

Support front silencer with special tool 31 2 220 and a suitable universal lifter, and secure against falling down.

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

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

Carry over separation point to faulty front silencer and mark.

Secure front silencer against falling out.

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

Fig 2: Identifying Separation Point To Faulty Front Silencer

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F10, F11, F18 only:

Release screws (1).

Tightening torque 18 20 4AZ .

Only if auxiliary heating fitted. Release screw (2) on metering pump.

Tightening torque 18 20 5AZ .

Release screws (3) on underbody panelling.

Remove reinforcement plate (4).

Fig 3: Identifying Reinforcement Plate, Underbody Panelling And Metering Pump Screw

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F07 only:

Release screws (1).

Remove heat shield (2).

Fig 4: Identifying Heat Shield And Screws

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F07 only:

Release screws (1).

Tightening torque 18 20 4AZ .

Only if auxiliary heating fitted. Release screw (2) on metering pump.

Tightening torque 18 20 5AZ .

Release screws (3) on underbody panelling.

Remove reinforcement plate (4).

Fig 5: Identifying Reinforcement Plate And Screws

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Release clamp (1).

Tightening torque 18 31 1AZ .

Feed out front silencer and remove.

Fig 6: Identifying Exhaust System Clamp

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Installation note:

Connect front silencer to rear silencer by means of clamp and align.

Center clamp and tighten down.

Tightening torque 18 20 3AZ .

Fig 7: Identifying Front Silencer Center Clamps

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NOTE: Check exhaust system for leaks.

Check rubber mounts, renew damaged rubber mounts.