11 28 020 Replacing tensioning device for alternator drive belt (N54, N54T)

Necessary preliminary tasks:

Remove protective cap on deflection pulley.

Remove special tool 11 3 340 .

Release screw (1) on belt tensioner.

Tightening torque 11 28 1AZ .

Fig 1: Removing Screw On Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement and direction of rotation of drive belt.

Fig 2: Identifying Drive Belt Rotation Direction

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.