11 28 020 Replacing tensioning device for alternator drive belt (N51)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

IMPORTANT: Aluminium-magnesium materials.

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

A magnesium crankcase requires aluminum screws/bolts exclusively.

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

The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.

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

Necessary preliminary tasks:

Remove special tool 11 3 340.

Release screw (3).

For tightening torque refer to 11 28 1AZ in 28 V-RIBBED BELT WITH TENSIONER .

Installation:

Replace aluminum screws.

Fig 1: Belt Tensioner And Belt Tensioner Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.