11 12 729 Checking cylinder head for watertightness (N63)

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required

Necessary preliminary tasks:

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 Bolts 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 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 In Special Tool (11 8 082)

Courtesy of BMW OF NORTH AMERICA, INC.

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