11 28 020 Replacing tensioning device for alternator drive belt (N52K)
- 11 3 340
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).
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).
Assemble engine.