Andy et al:
It's been my experience that when Michael Porter speaks, Triumph owners (should)
listen.
--
Martin Secrest
Listening Triumph Owner
Andy Dixon wrote:
> Michael,
> Excellent gap filling!!!!!!
> Goes in my keeper directory.
> Andy
>
> -----Original Message-----
> From: owner-triumphs@autox.team.net
> [mailto:owner-triumphs@autox.team.net]On Behalf Of Michael D. Porter
> Sent: Tuesday, February 08, 2000 2:26 PM
> To: Brian Sanborn; triumphs@autox.team.net; kkrice@earthlink.net
> Subject: Re: Valve guide seals for TR6
>
> Brian Sanborn wrote:
> >
> > >that's right but Ted Schumacher recommends fitment of small block Chevy
> V-8
> > >valve seals if you're having the head redone.
> >
> > Andy,
> >
> > I second the motion... my TR4 engine has teflon valve seals on the intake
> valves. I had it done along with hardened valve seats when the head was
> done. Modern technology is a good thing.... especially if it does not show.
> >
> > My shop took the standard bronze guides and machined them to accept teflon
> seals that they supplied to fit.
>
> Not to make light of anything Ted Schumacher says, but this probably
> needs further clarification. For most Triumphs, cast-iron guides are
> standard, not bronze. If an early engine has them, they were likely
> installed as part of a prior rebuild.
>
> It might not be a good idea to install stem seals on the cast iron
> guides, since both the guide and valve are steel, and very likely need
> more lubrication, hence no stem seals in the first place. Some of the
> worst-worn cast-iron guides I've ever seen were on engines with stem
> seals (earlier Ford V-8s with umbrella seals were notorious for that,
> especially as the engine got older and oil pressure dropped).
>
> Bronze guides, however do well with less lubrication, which is why most
> aluminum heads have aluminum bronze guides (cooperative expansion rates
> is another reason) and so valve stem seals are a stock item for them.
> And, yes, the replacement bronze guides do need to have a groove cut in
> them since the most commonly available stem seal for that diameter guide
> snaps into place on the guide.
>
> As for Kyle's original question about the stem seal interfering with the
> inner spring, that likely means that the stem seal chosen by the machine
> shop is inappropriate. If there are cast iron guides still installed,
> tell them not to put any on. If bronze guides are installed, they must
> machine grooves in the guides to accept a stem seal which will fit.
> Don't let them just press them on, because they will come off and
> eventually get beat up between the spring retainer and the guide.
>
> Cheers.
>
> --
>
> Michael D. Porter
> Roswell, NM
> mailto: mporter@zianet.com
>
> `70 GT6+ (being refurbished, slowly)
> `71 GT6 Mk. III (organ donor)
> `72 GT6 Mk. III (daily driver)
> `64 TR4 (awaiting intensive care)
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