Cylinder Head Grinding: AFN Engines

Hi everyone,

The following problem occurred: On the highway, the WAPU (water pump) failed on my vehicle. Even immediately shutting off the engine couldn't prevent a head gasket failure...

Okay, since I plan to drive my car for a while longer, I'm going to get this fixed. The current mileage is 256,000 km, and I think it's probably time to replace these parts anyway. Now I'm essentially forced to do it because exhaust gases are leaking into the cooling system.

Für den AFN gibt es 3 unterschiedlich starke Kopfdichtungen zu erkennen an der Kodierung mit 1-3 Löchern im "Fähnchen" der ZKD, das in der Nähe des 1. ZylIt stands out from the rest.

I would like to have my cylinder head planned before assembly. The question now is:
- Does it make sense to use a more robust insulation material after planning the head (of a structure)?
to install?
I would then have the difference between the two gasket thicknesses machined away.
(Currently using a ZKD with 2 holes, would then switch to the thickest version with 3 holes.)
(to equip, to install, to furnish)

Is this a good approach, or does it depend on how much needs to be planned (how far back can the "original" part be reinstalled)? Or is the general rule to install a thicker part according to the agreed-upon price to avoid increasing the compaction?

Thank you and best regards.
Achim.

Hello Achim,

Quote:

- Does it make sense to use a correspondingly stronger sealant after planning the head? to be installed?

No. While planning the cylinder head will lower the valves by the amount that is machined away, it shouldn't matter too much since not much material is removed. Besides, the valves have already worn into their seats with use, so there's definitely enough clearance.

Depending on the condition of the valve guides, it might be advisable to replace the valves, valve guides, and seals, and to re-grind the valves, especially after a certain amount of mileage.

Best regards, Rainer.