11 12 729 Checking cylinder head for watertightness (N63 hybrid)

WARNING: This page is about a different car, the 2011 BMW X6 and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

Necessary preliminary tasks:

NOTE: Set of special tools 11 8 080 can be used for cylinder bank 1 to 4 and cylinder bank 5 to 8.

Position special tool 11 8 081 on cylinder head.

Fig 1: Positioning Special Tool (11 8 081) On Cylinder Head

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Insert special tool 11 8 083 and tighten in sequence (1 to 10) in several steps.

Tightening torque: 25 Nm

Fig 2: Cylinder Head Bolts Tightening/Loosening Sequence

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Remove vent screw (1).

Tightening torque: 11 12 8 AZ.

Installation:

Replace sealing ring.

Fig 3: Identifying Vent Screw

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IMPORTANT: Max: 0.8 Nm.
Screw in special tool 11 8 082 with suitable tool and special tool 00 9 250 to 0.8 Nm.
Connect compressed air hose with pressure gauge.
Immerse cylinder head in a water bath. Inspection pressure 4.0 bar.
Check cylinder head for escaping air (cracks).

Fig 4: Screwing Special Tool (11 8 082)

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NOTE: If necessary, add cleaning agent to water bath.
Assemble engine.