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13 71 160 Removing and installing/replacing front air duct (N54)

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Risk of damage  through lever action at the top on the air duct!
Air duct may break!

Necessary preliminary tasks: 

Unlock and remove coolant hose (1).

Release quick-connect coupling (2) by turning lock and detach.

Release hose clamp and detach air duct (3).

Tightening torque, see 13 71 1AZ .

Fig 1: Locating Hose Clamp And Air Duct
G05502103Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Turn lock (1) back until arrow markings are flush.

Push air hose onto air duct.

Air hose must audibly snap into place.

Fig 2: Turn Lock (1) Back Until Arrow Markings Are Flush
G04755041Courtesy of BMW OF NORTH AMERICA, INC.

Release bolts and detach coolant hose (1).

Installation: 

Check sealing ring.

Replace damaged sealing ring.

Release screws (2).

Tightening torque, see 13 71 3AZ .

Fig 3: Locating Bolts And Coolant Hose
G05502105Courtesy of BMW OF NORTH AMERICA, INC.

Unclip line (1).

Release coolant hose (2) from holder (4), unlock and remove.

Release coolant hose (3) from holder (4) and lay downwards to one side.

Fig 4: Identifying Line, Coolant Hose And Holder
G05502106Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Detach air duct from turbocharger.
Risk of damage  through lever action at the top on the air duct!
Air duct may break!

Detach air duct (1) in direction of arrow.

NOTE: Illustration with engine removed.
Fig 5: Detaching Air Duct From Turbocharger
G05502107Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Check sealing ring (1) for damage.

Replace damaged sealing ring.

Make sure sealing ring (1) is correctly seated in air duct (2).

Fig 6: Identifying Sealing Ring And Air Duct
G05502108Courtesy of BMW OF NORTH AMERICA, INC.