Drive Belt Tensioner: Service and Repair

11 28 020 - Replacing alternator drive belt tensioner (N52)





Special tools required:
- 11 3 340 11 3 340 Locking Pin (2 Pieces)





Important!
Aluminium-magnesium materials.

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 Service and Repair.





Remove special tool 11 3 340 11 3 340 Locking Pin (2 Pieces).

Unscrew bolt (3).

Tightening torque:11 28 1AZ. 11 28 V-Ribbed Belt with Tension and Deflection Element

Installation Note:
Replace aluminium screws.





Assemble engine.