Headwork on a cracked head?

[Ken Keith]

<isham-research.freeserve.co.uk at pop.pol.net.uk> wrote:
> 
> > When I pulled the head on my WX those many years ago I found quite a few
> > instances of small cracks between the valve seats or from the valve seats to
> > the spark plug hole.  I guess the Bentley didn't exist at that time ... or
> > something ... memory is a bit fuzzy.  I remember taking the head to a
> > rebuilder, who took the thing apart and then told me it was bad and
> > irreparable.
> 
>   "Zylinderkoepfe mit Rissen zwischen den Ventilsitzen bzw. zwischen
>    Ventilsitzring und dem Zuendkerzgewinde koennen ohne Herabsetzen
>    der Lebensdauer weiterverwendet werden, wenn es sich um leichte,
>    max. 0,5 mm breite Anrisse handelt oder wenn nur die ersten
>    Gaenge des Zuendkerzengewindes gerissen sind."
> 
>    Audi 000.5148.29.00 5-zyl. Einspritzmotor (4-Ventiler), Mechanik
> 
> I hope that clears this up once and for all.

This may help: