Cylinder Head Assembly: Testing and Inspection

11 12 729 Checking cylinder head for water leaks (N18)

Special tools required:







Necessary preliminary tasks:
- Remove cylinder head.
- Disassemble cylinder head.







Extend special tool 11 9 521 with special tool 11 9 523.

Installation note:
Construct the special tool 11 9 521 so that all water channels are sealed.







Secure special tool 11 9 523 to 25 Nm.







IMPORTANT: For the N18 engine, the special tool 11 9 522 must be modified.

Dimension (A) 15 mm, Dimension (B) 79.85 mm.
Both dimensions must be transferred to special tool 11 9 522 .
Separate the upper corner along the dotted line with a suitable tool.







Screw special tool 11 9 522 with the existing screws (1 and 3) of the coolant thermostat.

Sealing flange must rest flat.

NOTE:
Compressed air at valve (2) must not exceed 3 bar.
Heat cylinder head to 60 °.
Visual inspection in a water bath.
Picture shows (N12).







Assemble engine.