11 12 729 Checking cylinder head for watertightness (N63)

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

Necessary preliminary work

Remove left cylinder head.
Remove right cylinder head.
Remove ALL VALVES.

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 Bolt Tightening/Loosening Sequence

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Remove vent screw (1).

Tightening torque: 11 12 8 AZ .

Installation note:

Replace sealing ring.

Fig 3: Identifying Cylinder Head 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 Using Suitable Tool

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