Date: Tue, 30 Mar 2004 21:48:00 -0800
Reply-To: Doug in CA <vanagon@ASTOUND.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Doug in CA <vanagon@ASTOUND.NET>
Subject: Re: Valve guide removal / replacement
Content-Type: text/plain; charset="iso-8859-1"
I would add another note from one of the other posts that is important.
Drilling out some of the metal of the guide makes it easier to press out and
the guide will take less metal (aluminum) with it.
Doug
----- Original Message -----
From: "Herr Wibo Fichten" <wibo.fichten@ROGERS.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, March 30, 2004 3:39 PM
Subject: Re: Valve guide removal / replacement
> Vanavitches,
>
> Thanks all for the informative answers. I did quite a search in the
archives
> and I'm convinced the archives are much enriched for your postings!
>
> The reason I was asking is because I am close to the 1.2mm wiggle
specified
> in Bently - with a used valve (no new one to test with ) But I think a
good
> clean-up and light lapping should put me back in business.
>
> I'm reproducing a response from: "Doug in CA" <vanagon@astound.net who
> P-mailed me a good detailed response that I think deserve the bandwidth /
> archive space
>
> Thanks again to all
>
> Fichten
>
> >
> To: "Herr Wibo Fichten" <wibo.fichten@ROGERS.COM>
> Sent: Tuesday, March 30, 2004 03:43
> Subject: Re: Valve guide removal / replacement
>
> The valve guides do wear out especially the exhaust side.
> The intakes run cooler and do not wear as quickly.
> You can check them for play with a new valve when the springs are out.
> if you can move the valve side to side much they are worn.
>
> We used an air chisel with a pilot end that goes inside the valve guide
and
> has a flat just undersize of the outside diameter. You drive them out from
> the combustion chamber side to the rocker side. The guides have a shoulder
> that bottoms against the rocker side of the head.
>
> They come in various oversizes because when you press them in and out you
> open up the bore in the head and you need a tight fit. The inside
diameter
> is standard for the valve stems at I believe is 8mm or perhaps larger like
9
> or 10mm. The air cooled beetle engines were 8mm stems.
>
> Once you press in new guides you have to re-touch up the valve seats to
> match or the new valves may not seat correctly.
>
> Silicon Bronze is I believe still the standard,
>
> Doug
>
>
> ----- Original Message -----
> From: "Herr Wibo Fichten" <wibo.fichten@ROGERS.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Monday, March 29, 2004 8:02 PM
> Subject: Valve guide removal / replacement
>
>
> > Hello Vanagonites the world over,
> >
> > Has anyone ever removed the valve guides. Bentley mentions nothing of
> this
> > procedure and the archives appear to be silent on the subject too. Does
> it
> > require specialized tools or presses?
> >
> > Mine seem pretty well stuck in the heads and I would hesitate a long
time
> > before banging away on them for fear of bending, breaking or deforming
> them.
> > In fact except for a single picture in Bentley, that suggests it, I
don't
> > even know if they come out from the piston side or the valve spring
side.
> >
> > The list vendors carry them and in several sizes. They refer to
oversized
> > guides: are we talking of inside diameter or outside diameter? Mine are
> so
> > tight (press fit?) I can't imagine it would be outside, but what use for
> > larger inside diameters? What is the purpose of these?
> >
> > Fichten
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