dbpulvino at hotmail.com
Mon Oct 9 15:27:35 EDT 2006
Woops, maybe should have done a little closer reading of that email...
>Replacing valve guides requires head removal. A head overhaul, automotive
>machine shop facility. Yes, the exhaust guides tend to wear more than the
>intake guides because they run hotter. When guides are replaced the stem
>seals are always replaced, so unless guide wear is measured and actually
>excessive, it was the seal replacement that likely solved the problem, not
>new guides. Exhaust valve stem sealing is not critical because there is not
>a large pressure diff across the seal as there is across the intake seal,
>which can suck in oil thru a bad seal.
>So, inasmuch as you have to tear down externals to remove the head, before
>doing so one can measure valve guide wear and decide if seal replacement is
>all that is necessary.
> > From: "Derek Pulvino" <dbpulvino at hotmail.com>
> > Date: Mon, 09 Oct 2006 09:37:28 -0700
> > To: patrick.anderson1 at comcast.net, eric.huppert at us.army.mil,
> > Jeff.Bernstein at pneumaticscale.com
> > Cc: 200q20v at audifans.com
> > Subject: Re: Burning Oil?
> > How long did that job take you? And I've heard the same about valve
> > guides...exhaust going a little quicker than intake.
> > Derek P
> >> As for idling in traffic causing a little smoke. I had that symptom and
> >> replacing the exhaust valve guides I fixed the problem. From what I
> >> the intake guides don't go bad as quickly as the exhaust ones.
> >> Patrick
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