11 12 000 Removing and installing/sealing cylinder head cover (N55) (VERSION 1)

Necessary preliminary tasks:

Release bolt (1) at rear of cable channel.

Tightening torque: 12 90 1AZ .

Fig 1: Identifying Rear Cable Channel And Bolt

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Release nuts (1) and remove earth cable.

Tightening torque: 12 90 5AZ .

Unlock all connectors from ignition coils and injectors and detach.

Unclip wiring harness (2), feed out and remove.

Fig 2: Identifying Wiring Harness And Nuts

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Release screws (1).

Remove flange (2).

Fig 3: 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 4: Detaching 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 5: Identifying Engine Vent Line, Air Intake System And Cylinder Head Cover

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Fig 6: Cylinder Head Cover Screws Tightening/Loosening Sequence (N55)

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

Remove cylinder head cover.

Replace all gaskets.

Fig 7: Cylinder Head Cover Screws Tightening/Loosening Sequence (N55)

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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 .