11 28 020 Replacing tensioning device for alternator drive belt (N52K)

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2013 BMW 328xi, 2013 BMW 328i, 2012 BMW 328xi, 2012 BMW 328i, and 2011 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 3 340

IMPORTANT: Aluminium-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminium screws/bolts exclusively.

Aluminium screws/bolts must be replaced each time they are released .

Aluminium screws/bolts are permitted with and without color coding (blue).

For reliable identification:

Aluminium screws/bolts are not magnetic .

Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

Remove Drive Belt

E9x only:

Remove special tool 11 3 340.

Release screw (3) on belt tensioner (4).

For tightening torque refer to 11 28 1AZ in 11 28 RIBBED V-BELT WITH TENSION AND DEFLECTION SYSTEM .

Installation:

Replace aluminium screws.

Remove belt tensioner (4).

Fig 1: Belt Tensioner And Belt Tensioner Screw

G04751147

Courtesy of BMW OF NORTH AMERICA, INC.

E85 only:

Remove special tool 11 3 340.

Release screw on belt tensioner (1).

For tightening torque refer to 11 28 1AZ in 11 28 RIBBED V-BELT WITH TENSION AND DEFLECTION SYSTEM .

Installation:

Replace aluminium screws.

Remove belt tensioner (1).

Fig 2: Belt Tensioner And Drive Belt

G04751148

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.