11 12 000 Removing and installing/sealing cylinder head cover (N52)
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 tasks:
- Remove IGNITION COILS .
- Release ignition wiring harness in cylinder head cover area.
- Remove right TENSION STRUT .
- Remove FIREWALL , center.
Unlock and detach vent hose (1).
If necessary, pull off metal bracket (2) in direction of arrow.
Release screws (3) on electric servomotor.
Tightening torque 11 37 3AZ .
Release screw on electric servomotor.
Tightening torque 11 37 3AZ .
Remove servomotor (4) in direction of arrow.
Installation location of screws (1 and 2) is specified by the different bush shapes.
Release screws in area (1).
Tightening torque 11 12 5AZ .
Installation note:
Replace aluminum screws .
Release threaded bolt (2).
Tightening torque 11 12 5AZ .
Installation note:
Replace aluminum screws .
Installation note:
Slotted sleeves (2) for guiding ignition coils in cylinder head cover (1) must be replaced.
Remove slotted sleeves (2).
Installation note:
Clean all sealing surfaces (1 and 2).
Installation note:
Replace gaskets (1 and 2) .
Replace ECCENTRIC SHAFT SENSOR SEALING RING (1) if necessary.
Installation note:
This operation cannot be performed with the cylinder head cover installed.
Assemble engine.