11 28 020 Replacing tensioning device for alternator drive belt (N63 O1)

Special tools required: 

• 11 0 390 .

Necessary preliminary work: 

• Remove alternator DRIVE BELT .

If necessary, remove special tool 11 0 390 .

Release screw (1).

Tightening torque 11 28 1AZ .

Remove belt tensioner with idler pulley (2).

Fig 1: Identifying Idler Pulley And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.