18 00 020 Removing and installing complete exhaust system (N63O1)

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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:

Remove rear UNDERBODY PROTECTION .

Support exhaust system with special tool 31 2 220.

Fig 1: Supporting Exhaust System With 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 Clamp

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Unscrew nuts (1).

Tightening torque 18 20 1AZ .

Fig 3: Identifying 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 Nut

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Fig 7: Identifying Bolt And Nut

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Installation note:

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

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 8: 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.