11 28 020 Replace alternator drive belt tensioner (N54)

Special tools required: 

• 11 3 340

Necessary preliminary tasks: 

• Remove DRIVE BELT 

Slowly turn belt tensioner (2) with a suitable tool in direction of arrow until special tool 11 3 340 can be removed.

Relieve tension on belt tensioner (2).

Release screw (1).

Tightening torque 11 28 4AZ .

Remove belt tensioner (2).

Fig 1: Turning Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.