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

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:

Fit special tool 11 7 190 .

Installation note:

Secure special tool to 15 Newton meters.

Fig 1: Fitting Special Tool 11 7 191

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

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

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.