18 12 031 Replacing rear silencer (N20)

Special tools required: 

• 31 2 220

Support rear silencer using special tool 31 2 220 or a suitable jack and secure against falling off.

Fig 1: Supporting Rear Silencer Using Special Tool (31 2 220)

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Fig 2: Identifying Silencer Separation Point

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Release nut and remove holder (1).

Tightening torque: 18 31 3AZ .

Fig 3: Identifying Silencer Holder

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Release nuts (1) and remove holder.

Tightening torque: 18 31 5AZ .

Fig 4: Identifying Exhaust System Nuts

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Only 20i: 

Unscrew nuts (1).

Tightening torque: 18 31 5AZ .

Lower and remove the rear silencer carefully with assistance of a second person.

Fig 5: Identifying Exhaust System Nuts

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Only 28i: 

Pull off vacuum hose (1).

Unscrew nuts (2).

Tightening torque: 18 31 5AZ .

Lower and remove the rear silencer carefully with assistance of a second person.

Fig 6: Identifying Vacuum Hose And Nuts

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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 To Rear Silencer Clamp

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Replace damaged rubber mount.

Check exhaust system for leaks.