Removing and installing the clean air pipe (B46/B48 4-Cyl. Engine) (4' Series Coupe/Convertible, 4' Series Gran Coupe Sedan)

Necessary preliminary work: 

• Remove INTAKE SILENCER HOUSING .

Removal: 

Unlock and open engine vent pipe (1).

Unlock and loosen tank ventilation line (2).

Unlock clamp (3) on exhaust turbocharger and release.

Feed out clean air pipe (4) and remove it.

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Preparation for installation: 

Replace the sealing ring (1) on the top clean air pipe if it is damaged.

Part:  Sealing ring

Check clean air pipe for cleanliness, and clean the oil residue if necessary.

Courtesy of BMW OF NORTH AMERICA, INC.

Replace the sealing ring (1) on the bottom clean air pipe if it is damaged.

Part:  Sealing ring

Check clean air pipe for cleanliness, and clean to clear the oil residue if necessary.

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Thread in clean air pipe (4) and install.

The clamp (3) must engage audibly on the exhaust turbocharger.

Connect and lock tank ventilation line (2).

Tank ventilation line (2) must snap audibly into place.

Connect and lock engine vent pipe (1).

Engine vent pipe (1) should be engaged audibly.

Courtesy of BMW OF NORTH AMERICA, INC.

Required follow-up work: 

• Install INTAKE SILENCER HOUSING .