AFN Cylinder Head Repair

Hi everyone,

Problem: On the highway, the WAPU in my AFN malfunctioned. Even an immediate shutdown of the engine couldn't protect me from a cylinder head gasket failure....

Well, since I want to keep using my AFN for quite some time, I'm going to fix it. The current mileage is 256,000 km, and I think it's probably time to replace these kinds of things anyway. Now I am practically forced to do this, as coolant is being forced into the cooling system.

For the AFN, there are 3 different strength head gaskets that can be identified through the coding with 1-3 holes in the "flag" of the ZKD, located near the 1st. Extends beyond the cylinder.

I would like to have my cylinder head planed before I assemble it. The question is now, of course:
- Does it make sense to apply a correspondingly stronger sealant after planning the head?
to incorporate?
I would then have the difference in the two sealing thicknesses milled away.
(Currently using a ZKD with 2 holes, would then switch to the thicker version with 3 holes)
installing)

Is that sensible, or does one say it depends on how much needs to be planned (up to what point can the "original" be re-installed), or does one generally say that one builds a thicker one according to the acceptance amount in order not to increase the density?

Thank you and best regards.
Achim

[Translating...]

Hallo Achim,

Quote:

- Macht es Sinn nach dem Planen des Kopfes eine entsprechend stärkere Dichtung einzubauen?

nein. Durch das Planen des ZK kommen zwar die Ventile um den abgefrästen Betrag tiefer, sollte aber egal sein, soviel fräst man ja nicht ab. Davon abgesehen haben sich bei der Laufleistung eh die Ventile etwas in den Sitzen eingeschlagen, so daß da auf jeden Fall genug Luft ist.

Je nachdem wie ausgeschlabbert die Ventilführungen sind, wäre es evtl. bei der Laufleistung sinnvoll neue Ventile/Ventilführungen/Dichtungen zu verbauen und die Ventile einzuschleifen.

Grüße, Rainer