11 28 020 Replacing tensioning device for alternator drive belt (N52)
Special tools required:
- 11 3 340 .
IMPORTANT:
Aluminum-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 .
Joining 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 .
Joining torque and angle of rotation must be observed without fail (risk of damage) .
Necessary preliminary work:
- Remove DRIVE BELT .
Remove special tool 11 3 340 .
Release screw (3) on belt tensioner (4).
Tightening torque 11 28 1AZ .
Installation note:
Replace aluminum screws .
Remove belt tensioner (4).
Assemble engine.