11 12 000 Removing and installing/sealing cylinder head cover (N55)

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Necessary preliminary tasks:

Remove right TRAILING LINK
Release ENGINE WIRE HARNESS in the area of the cylinder head cover.
Disconnect PRESSURE LINES .
Remove CLEAN AIR PIPE .

Release screws (1).

Remove flange (2).

Installation note:

Renew sealing flange.

Fig 1: Identifying Flange And Screws

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Press and hold down the unlocking device on the vacuum line (1) on the vacuum reservoir (cylinder head cover) in the direction of the arrow.

Detach vacuum line (1) in upward direction.

Fig 2: Unlocking Vacuum Line

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IMPORTANT: Do not loosen the engine vent line (4) on the cylinder head cover.

To dismantle the engine vent line, loosen the screws on the air intake system (3).

NOTE: When changing a faulty engine vent line, the clutch on the coupling on the cylinder head cover may be broken open.

Fig 3: Identifying Engine Vent Line And Screws On Air Intake System

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Release screws of cylinder head cover from outside inwards in 1/2 turns.

Fig 4: Cylinder Head Cover Bolts Tightening/Loosening Sequence (N55)

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Remove cylinder head cover.

Replace all gaskets.

Fit cylinder head cover.

Insert screws of the cylinder head cover by 1/2 turn.

Tighten fit screws (1) using 8.5 Nm.

Tighten positional screw (2) using 8.5 Nm.

Tighten remaining screws of cylinder head cover in sequence 3 to 23.

Tightening torque: 11 12 4AZ .

Fig 5: Cylinder Head Cover Bolts Tightening/Loosening Sequence (N55)

Courtesy of BMW OF NORTH AMERICA, INC.