Cylinder Head Assembly: Testing and Inspection

11 12 729 Checking Cylinder Head For Water Leaks (N16)

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:
Assembly special tool 11 9 521 so that all water channels are sealed.







Fix special tool 11 9 523 by tightening to 25 Nm.







IMPORTANT: For the engines N16 and N18, the special tool 11 9 522 has to be modified.

Dimension (A) 15 mm, dimension (B) 79.85 mm.
Both dimensions have to be transferred to special tool 11 9 522 .
Using a suitable tool, cut off the top corner along the dotted line.







Screw special tool 11 9 522 into place with existing screws (1 and 3) of 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.