11 12 729 Checking cylinder head for watertightness (N63)

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2017 BMW M6, 2017 BMW 650i xDrive, 2017 BMW 650i, 2017 BMW 640i xDrive, and 2017 BMW 640i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

Necessary preliminary work:

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

Courtesy of BMW OF NORTH AMERICA, INC.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Remove vent screw (1).

Tightening torque: 11 12 8AZ .

Installation note:

Replace sealing ring.

Fig 3: Identifying Vent Screw

Courtesy of BMW OF NORTH AMERICA, INC.

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: Identifying Special Tool (11 8 082)

Courtesy of BMW OF NORTH AMERICA, INC.

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

Assemble engine.