11 28 020 Replace Alternator Drive Belt Tensioner (N54)

Special tools required: 

• 11 3 340

Necessary preliminary tasks: 

• Remove drive belt.

Remove special tool 11 3 340. See 11 3 340 LOCKING PIN (2)

Release screw on belt tensioner.

Tightening torque, see 11 28 1AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

Fig 1: Identifying Drive Belt Screw And Belt Routing

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.