18 00 020 Removing and installing complete exhaust system (N63 B40/B44 O 1)

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Special tools required:

31 2 220

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

Danger of injury!

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

Necessary preliminary tasks:

F01, F02 only:
Remove cover of exhaust pipe on left and right.
F07, F12 only:
Remove trailing links.
Only F06, F07, F12, F13:
Remove rear UNDERBODY PROTECTION .

Support exhaust system with special tool 31 2 220.

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

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Picture shows the right side, the procedure for the left side is identical.

Release clamp (1).

Tightening torque 18 31 1AZ .

Fig 2: Identifying Exhaust System Clamp

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Unscrew nuts (1).

Tightening torque 18 20 1AZ .

Fig 3: Identifying Exhaust System Nuts

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If fitted:

Release screws (1).

Remove heat shield (2).

Fig 4: Identifying Heat Shield And Screws

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Release screws (1).

Tightening torque 18 20 6AZ .

Only when independent heating is fitted: release screw (2) on metering pump.

Tightening torque 18 20 7AZ .

Release screws (3) on underbody panelling.

Remove reinforcement plate (4).

Fig 5: Identifying Reinforcement Plate And Screws

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Picture shows the left side, the procedure for the right side is identical.

Slacken nut (1).

Tightening torque 18 20 4AZ .

Fig 6: Identifying Exhaust System Nut

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F06 only:

Remove cover (1).

Fig 7: Identifying Cover

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Picture shows the left side, the procedure for the right side is identical.

Release nut (1) and remove ground strap.

Spray the bolt (2) and rubber mount with lubricant 5.2 .

Release screw (2).

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

Installation note:

Risk of damage to screw (2) and retaining plate thread.

Fig 8: Identifying Ground Strap Nut, Bolt And Rubber Mount

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Observe screwing sequence .

Firstly apply nut to body at rear.
Then join bolt (2) exactly and secure. If necessary support rear silencer using a suitable jack.
Tightening torque 18 20 5AZ .

Picture shows the left side, the procedure for the right side is identical.

Slacken nut (1).

Tightening torque 18 20 5AZ .

Detach hose (2) on vacuum unit.

Installation note:

Check vacuum hose (2) for damages.

Replace damaged section of vacuum line and protect it with a woven protective hose.

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

Fig 9: Identifying Vacuum Unit Hose And Nut

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Installation note:

Check rubber mount for damage.

If necessary, replace damaged rubber mounts.

Check exhaust system for leak tightness.