11 12 000 Removing And Installing/Sealing Cylinder Head Cover (N51)

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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 acoustic cover.
Remove rod-type ignition coils.
Unclip wiring harness for fuel injectors.
Remove tension strut . See 51 71 371 REMOVING AND INSTALLING/REPLACING TENSION STRUT ON LEFT OR RIGHT SPRING STRUT DOME .
Remove clean air duct . See 51 13 115 REMOVING AND INSTALLING/REPLACING COWL PANEL COVER .

Unlock and detach engine vent hose (1).

If necessary, pull off metal bracket (2) in direction of arrow.

Release screws (3).

Tightening torque. See 11 37 3AZ in 11 37 VARIABLE VALVE GEAR .

Remove servodrive (4) in direction of arrow.

If necessary, release nuts (5).

If necessary, remove secondary air valve (6).

Installation:

Replace aluminum screws .

Fig 1: Pulling Off Metal Bracket

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws in area (1).

Installation:

Replace aluminum screws.

Tightening torque. See 11 12 4AZ in CYLINDER HEAD WITH COVER .

Release screws (2).

Tightening torque. See 11 12 4AZ in CYLINDER HEAD WITH COVER .

Installation:

Replace aluminum screws .

Fig 2: Identifying Screws

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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 And Cylinder Head Cover

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Replace seal (1).

Replace seal (2).

Installation:

Clean all sealing surfaces.

Do not clean sealing faces (1 and 2) with a metal-cutting tool.

Fig 4: Identifying Seal And Sealing Faces

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Assemble engine.