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:

Remove CYLINDER HEAD .
Disassemble Cylinder Head. See INTAKE CAMSHAFT , EXHAUST CAMSHAFT , and VALVES .

Fit Special Tool 11 7 190 .

Installation Note:

Secure Special Tool To Max. 15 Nm.

Fig 1: Fitting Special Tool 11 7 190

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 and Turning Knurled Knob

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.