[Vwdiesel] Help - messed in the head...

[Val Christian]

I wrote previously about the texturing of the head surface ("ground
finish").  Apparently, some head gasket manufacturers are now 
recommending this type of finish.  The concern is that a glass
smooth finish (what I have traditionally been used to), tends to
burnish the cylinder ehad gasket.  The rougher finish bites
into the gasket, and allows the plastic deformation of the 
gasket, rather than the surface movement at the gasket interface.

Perhaps someone else has more knowledge on this.

Val





> The head I 
> saw at the other shop I visited was like a smooth mirror finish - that's what 
> I 
> was expecting.
> 
> 
>   I've seen the gamut from about 150 grit finish to nearly mirror flycut to 
> the same drag gouges as you had except none were deep enough to 
> be an issue.  
>   I clear coated a couple heads and manifolds after bead blasting them 
> but gray/grey????  Yech!
>   The prechamber inserts are actually pretty darn soft, that's why they 
> tend to gall and drag through the aluminum.  A 1/4" crack in an insert 
> sounds about big enough to want to scrap it.  I may have one out of 
> Dad's head I scrapped out.  Haven't gotten it hauled to a recycler yet.
>      Loren
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