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.
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.
Fit special tool 11 4 342 with screws (1). Screw in knurled screw in direction of arrow.
Sealing flange must rest flat.
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.
Assemble engine.