11 28 020 Replacing tensioning device for alternator drive belt (N51)
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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 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 Drive Belt.
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.
Assemble engine.