11 28 020 Replacing tensioning device for alternator drive belt (S65)

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Mark the direction of rotation of the drive belt if it is to be reused.
Replace the drive belt if it is fouled with coolant or engine oil.

Necessary preliminary tasks:

Remove fan cowl with electric fan.
Remove A/C compressor drive belt.

Release screws (1).

Remove alternator drive belt.

Remove belt pulley (2) from coolant pump.

Fig 1: Identifying Belt Pulley And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1 and 2).

Remove belt tensioner (3) with tensioning pulley.

Installation:

Observe the installation direction if the belt tensioner is replaced individually.

The lettering TOP must point upwards.

Fig 2: Identifying Belt Tensioner And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.