11 28 020 Removing and installing/replacing the belt tensioner for the alternator (N47D20 K/U/O/T 1)

Special tools required: 

• 11 3 340

Necessary preliminary tasks: 

• Remove ALTERNATOR DRIVE BELT .

Release screws (1).

Remove belt tensioner (2) with roller and deflecting element.

Fig 1: Removing Belt Tensioner With Roller And Deflecting Element

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

If a tensioning device is no longer needed, the special tool 11 3 340 must be removed using a vice.