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 aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
The end faces of aluminium 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 acoustic cover.
- Remove rod-type ignition coils.
- Unclip wiring harness for fuel injectors.
- Remove Tension Strut.
- Remove Clean Air Duct.
Unlock and detach engine vent hose (1).
If necessary, pull off metal bracket (2) in direction of arrow.
Release screws (3).
For tightening torque refer to 11 37 3AZ in 11 37 VARIABLE VALVE GEAR (N52) .
Remove servodrive (4) in direction of arrow.
If necessary, release nuts (5).
If necessary, remove secondary air valve (6).
Installation:
Replace aluminium screws.
Release screws in area (1).
Installation:
Replace aluminium screws.
For tightening torque refer to 11 12 4AZ .
Release screws (2).
For tightening torque refer to 11 12 4AZ .
Installation:
Replace aluminium screws.
Replace seal (1).
Replace seal (2).
Installation:
Clean all sealing surfaces.
Do not clean sealing faces (1 and 2) with a metal cutting tool.
Assemble engine.