11 28 020 Replace alternator drive belt tensioner

Special tools required: 

• 11 3 340

Necessary preliminary tasks: 

• Remove DRIVE BELT .

Remove special tool 11 3 340. 

Release screw on belt tensioner.

Tightening torque:11 28 1AZ .

Fig 1: Releasing Belt Tensioner Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.