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 11 34 552 REMOVING AND INSTALLING/REPLACING ALL VALVES (N55) , 11 31 028 REMOVING AND INSTALLING/REPLACING EXHAUST CAMSHAFT (N55) or 11 31 025 REMOVING AND INSTALLING/REPLACING INTAKE CAMSHAFT (N55) .

Fit special tool 11 7 190 .

Installation note:

Secure special tool to 15 Newton meters.

Fig 1: Identifying Special Tool (11 7 191)

G09844271

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: Identifying Special Tool (11 4 342) & Screws

G04751057

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: Identifying Special Tool (11 4 344) With Screws

G04751058

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.