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

[Val Christian]

Pebbled, more than beaded.  

Can't comment on your situation.  Not enough experience.  

Val

> 
> I remember that post, but didn't recall who said it. It sounded like you were talking 
> about a slightly pebbled or beaded surface, right? That sounds like an interesting 
> theory, many gasket surfaces are like this - water pump, etc.
> 
> I'm worried that a cutting wheel arc leading right across the head is a recipe for early 
> head gasket failure - even if I can't catch a nail on it, the grooves still worry me.
> 
> On 15 Apr 2005 at 10:13, Val Christian <val at swamps.roc.ny.us> wrote:
> 
> > 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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> > > 
> > 
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> 
> Shawn Wright
> http://zuiko.sls.bc.ca/~swright
> '85 Jetta D 
> '88 Westy 2.1L, soon to be 1.6TD 5 speed
>  (see progress at http://members.shaw.ca/vwdiesels)
> '82 Diesel Westy
> 
> 
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