18 00 020 Removing and installing complete exhaust system (N74)

Necessary preliminary tasks: 

• Remove COVER for exhaust pipe on left and right
• F03 Only: 

Remove underbody protection on left and right

Support exhaust system with special tool 31 2 220.

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

Courtesy of BMW OF NORTH AMERICA, INC.

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

Unscrew nuts (1).

Tightening torque: see 1AZ in 18 31 EXHAUST SYSTEM

Replace self-locking nuts and seals.

Fig 2: Identifying Exhaust System Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: see 2AZ in 18 20 EXHAUST SYSTEM SUSPENSION

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

Tightening torque: see 3AZ in 18 20 EXHAUST SYSTEM SUSPENSION

Release screws (3) on underbody panels.

Remove reinforcement plate (4).

Fig 3: Identifying Reinforcement Plate And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

Release exhaust system from rubber mount (1).

Check rubber mount for damage. Replaced damaged rubber mounts.

Fig 4: Identifying Rubber Mount

Courtesy of BMW OF NORTH AMERICA, INC.

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

Unscrew nuts (1).

Tightening torque: see 1AZ in 18 20 EXHAUST SYSTEM SUSPENSION

Fig 5: Identifying Left Side Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

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

Detach hose (1) on vacuum unit.

Slacken nut (2).

Tightening torque: see 1AZ in 18 20 EXHAUST SYSTEM SUSPENSION

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

Fig 6: Identifying Vacuum Unit Hose And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Check rubber mount for damage.

If necessary, replace damaged rubber mounts.

Check exhaust system for leaks.