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18 00 020 Removing and installing complete exhaust system (N55 Hybrid)

Special tools required: 

WARNING: High-voltage system - danger to life!

The following points must be strictly observed prior to starting work: 

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.

Support exhaust system with special tool 31 2 220.

Fig 1: Supporting Exhaust System Using Special Tool (31 2 220)
G11177124Courtesy of BMW OF NORTH AMERICA, INC.

Release clamp (1).

Tightening torque 18 31 1AZ .

Fig 2: Identifying Exhaust System Clamp
G11177125Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 18 31 4AZ .

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

Tightening torque 18 31 5AZ .

Release screws (3) on underbody panelling.

Remove reinforcement plate (4).

Fig 3: Identifying Reinforcement Plate, Metering Pump And Underbody Panelling Screws
G11177126Courtesy of BMW OF NORTH AMERICA, INC.

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

Slacken nut (1).

Tightening torque 18 20 3AZ .

Fig 4: Identifying Exhaust System Nut
G11177127Courtesy of BMW OF NORTH AMERICA, INC.

Slacken nut (1).

Tightening torque 18 31 3AZ .

Fig 5: Identifying Exhaust System Nut
G11177128Courtesy of BMW OF NORTH AMERICA, INC.

Pull off vacuum hose from vacuum unit (1).

Slacken nut (2).

Tightening torque 18 31 3AZ .

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

Fig 6: Identifying Vacuum Unit And Nut
G11177129Courtesy of BMW OF NORTH AMERICA, INC.

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

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.

Fig 7: Identifying Exhaust System Screw
G11177130Courtesy of BMW OF NORTH AMERICA, INC.

Observe sequence: 

  1. Firstly apply nut to body at rear.
  2. Then join bolt (1) exactly and secure. If necessary support rear silencer using a suitable jack.

Tightening torque 18 31 3AZ .

Installation note: 

Check rubber mount for damage.

If necessary, replace damaged rubber mounts.

Check exhaust system for leak tightness.