11 28 020 Replacing tensioning device for alternator drive belt (S63T 0)

Special tools required: 

• 11 0 390

Necessary preliminary tasks: 

• 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 Belt Tensioner With Idler Pulley And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.