11 28 020 Replacing tensioning device for alternator drive belt (N52K)
WARNING: This page is about a different variant/trim than selected.
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 .
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic .
Jointing torque and angle of rotation must be observed without fail (risk of damage) .
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 .
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum 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).
Tightening torque 11 28 1AZ .
Installation:
Replace aluminum screws.
Remove belt tensioner (4).
E85, E89 only
Remove special tool 11 3 340.
Release screw on belt tensioner (1).
Tightening torque 11 28 1AZ .
Installation:
Replace aluminum screws.
Remove belt tensioner (1).
Assemble engine.