11 12 000 Removing and installing/sealing cylinder head cover (N52T)

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IMPORTANT: Aluminum-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.
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic.
Jointing 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 BULKHEAD , 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 .

NOTE: A further screw, which cannot be seen in the Fig 1, must be released under the electric servomotor (4).

Fig 1: Identifying Vent Hose, Bracket, Screw, Nuts And Electric Servomotor

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Release screw on electric servomotor.

Tightening torque: 11 37 3AZ .

Remove servomotor (4) in direction of arrow.

IMPORTANT: Observe different screw lengths.
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.

Fig 2: Identifying Threaded Bolt And Screws

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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).

Fig 3: Identifying Slotted Sleeves For Ignition Coils In Cylinder Head Cover

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Installation note:

Clean all sealing surfaces (1 and 2).

IMPORTANT: Do not use any metal-cutting tools.

Installation note:

Replace gaskets (1 and 2).

Fig 4: Identifying Sealing Surfaces

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Replace ECCENTRIC SHAFT SENSOR SEALING RING (1) if necessary.

Installation note:

This operation cannot be performed with the cylinder head cover installed.

Fig 5: Removing Eccentric Shaft Sensor Sealing Ring

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Assemble engine.