11 12 729 Checking cylinder head for water leaks (N47 D20 O1)

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Special tools required:

IMPORTANT: Pressure-test cylinder head to max. 3 bar.
Heat cylinder head to 60 °.
Check for bubble formation in a water bath.

Necessary preliminary work:

Remove CYLINDER HEAD .
Disassemble CYLINDER HEAD .

Extend special tool 11 8 891 with special tool 11 8 893 .

Fig 1: Identifying Special Tool (11 8 891) And Cylinder Head

G09943635

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Mounting special tool 11 8 890

Use bolts to fasten 11 8 891 special tool 11 8 893 .

Tightening torque: 25 Nm .

Fig 2: Cylinder Head Bolts Tightening/Loosening Sequence

G09943636

Courtesy of BMW OF NORTH AMERICA, INC.

Fasten special tool 11 6 232 with screw (1).

Fig 3: Identifying Special Tool (11 6 232) & Screw With Torque Specifications

G09943637

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 6 231 with screw.

NOTE: Compressed air at valve (1) must not exceed 3 bar .
Heat cylinder head to 60 °.
Check for bubble formation in a water bath.

Fig 4: Identifying Special Tool (11 6 231) & Screw With Torque Specifications

G09943638

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.