18 00 020 Removing and installing complete exhaust system (N20)

Special tools required:

31 2 220

WARNING: Risk of burning!
Only carry out this repair work when the exhaust system has cooled down.

IMPORTANT: Removal of the exhaust system must be carried out with the assistance of a second person.

Support exhaust system with jack and special tool 31 2 220 or other suitable special tool and secure against falling down.

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

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Necessary preliminary tasks:

F07, F11 only:

Remove left trailing link.

Release clamp (1).

Tightening torque 18 31 1AZ .

Fig 2: Identifying Exhaust System Clamp

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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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Unfasten nut.

Tightening torque 18 31 3AZ .

Fig 6: Identifying Rear Silencer (N20) Nut

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Spray bolt (1) and rubber mount with lubricant 5.2 .

Release screw (1).

Installation note:

Risk of damage to screw (1) and retaining plate thread.

Observe screwing sequence .

Firstly apply nut to body at rear.
Then join bolt (1) exactly and secure. If necessary support rear silencer using a suitable jack.
Tightening torque 18 31 6AZ .

Fig 7: Identifying Join Bolt

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Detach pressure hose (1).

Slacken nut (2).

Tightening torque 18 31 5AZ .

Lower and remove exhaust system with assistance of a second person.

Partially release cover at bottom if necessary.

Fig 8: Identifying Pressure Hose And Nut

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Installation note:

Check exhaust system for leaks.