Checking Cylinder Head For Water-Tightness

Evening Out Cylinder Head Sealing Surface
(Cylinder Head Dismantled)





Prepare special tool kit 11 7 390.

Note: Special tool kit 11 7 390 comprises special tools 11 7 391/392/393/394/395/396/397/398.

Place special tool 11 7 391/392 on cylinder head sealing surface and screw down with cylinder head bolts.





Turn back screw (1).

Note: Special tool 11 7 394 is secured with a pin (2).

Fit special tool 11 7 394.





Insert screw (1) by hand until special tool 11 7 393 rests on sealing surface.
Tighten down screw (1) by approx. a half to one turn.





Check sealing rings (1) and coat with water as anti-friction coating. Insert special tool 11 7 395 and tighten down.





Seal coolant apertures with special tool kit 11 7 390.





Connect compressed air to special tool 11 7 395.
Immerse cylinder head in a water bath. Inspection pressure 4.5 bar.
Check cylinder head for escaping air (cracks).

Note: If necessary, soften the bath water with a cleaning agent.