[Vwdiesel] Help - messed in the head...
swright at zuiko.sls.bc.ca
Fri Apr 15 10:35:25 EDT 2005
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.
> > 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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> > Vwdiesel at vwfans.com
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