11 28 020 Replacing tensioning device for alternator drive belt (M57T2-SCR)

Necessary preliminary work 

• Remove drive belt

Release screws (2) and remove tensioning pulley (1) towards front.

Fig 1: Identifying Screws And Tensioning Pulley

Courtesy of BMW OF NORTH AMERICA, INC.

Necessary preliminary work 

• Remove FAN COWL
• Remove PRESSURE PIPE  (charge air cooler to EGR valve)

Release screw (1) and remove roller (2).

Release screw (3) and remove tensioning pulley with lever (4) in direction of arrow.

Fig 1: Removing Tensioning Pulley With Lever

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Remove belt tensioner in direction of arrow.

Installation note: 

Replace gasket (2).

Fig 2: Removing Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.