11 12 729 Checking cylinder head for water leaks (N55)

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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 tasks:

Remove CYLINDER HEAD .
Disassemble cylinder head. See REMOVING INTAKE CAMSHAFT , REMOVING EXHAUST CAMSHAFT , and REMOVING ALL VALVES .

Fit special tool 11 7 190 .

Installation note:

Secure special tool to max. 15 Nm.

Fig 1: Identifying Special Tool (11 7 190)

G10055796

Courtesy of BMW OF NORTH AMERICA, INC.

Fit special tool 11 4 342 with screws (1). Screw in knurled screw in direction of arrow.

Sealing flange must rest flat.

Fig 2: Fitting Special Tool (11 4 342) With Screws

G10055797

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 4 344 with bolts (1).

NOTE: Compressed air at valve max. 3 bar .

Heat cylinder head to 60 °.

Check for bubble formation in a water bath.

Fig 3: Securing Special Tool (11 4 344) With Bolts

G10055798

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.