11 28 020 Replacing tensioning device for alternator drive belt (N55)

Special tools required: 

• 11 0 390

Necessary preliminary tasks: 

• Remove DRIVE BELT 

Remove special tool 11 0 390 .

Release screw (1) on belt tensioner.

Tightening torque 11 28 1AZ .

Fig 1: Releasing Screw On Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.