[Fot] TR4 Valve Guide Clearance

[Tony Drews]

Absolute minimum for racing with bronze guides is 3 thou on intake, 
3.5 thou on exhaust.  I like an additional 0.5 thou comfort 
clearance.  Less than that and they stick when the head gets 
hot.  Running clearance is much less as the bronze and the valve stem 
both expand, so it doesn't smoke.  Learned this through experience.

Tony Drews

At 09:21 AM 6/28/2014, John Styduhar wrote:
>I always appreciate someone sharing their wisdom.  Ed, based on your
>experience, was the sticking valve problem primarily on the intake or
>exhaust valve? On any particular cylinder?  Do you think the problem was
>due to overheating, lack of oiling, bent valve, etc? Thanks
>
>
>On Sat, Jun 28, 2014 at 9:59 AM, EDWARD BARNARD <edwardbarnard at prodigy.net>
>wrote:
>
> > Marcel:
> > I believe the head your were running on your TR3 was one that I did
> > and sold you a few years back. Can't remember if I installed cast iron or
> > bronze guides for you. If they were cast iron I reamed them for
> > .001"-.0015".
> > If bronze I usually ream them to .003"-.0035" for added clearance. It would
> > take a full hand of fingers to count the stuck valves we've had with bronze
> > guides reamed to stock spec's. Hard for me to justify bronze guides when I
> > have to ream them to worn out spec's to get them to work. Oh, and they
> > cost 5x
> > more than cast iron.
> > -Ed Barnard-
> >
> >
> >
> > On Saturday, June 28, 2014 12:05 AM,
> > Marcel Van Mulders <van.mulders.marcel at telenet.be> wrote:
> >
> >
> >
> > In the Triumph
> > Service Instruction Manual, 0.001" to 0.003" is recommended.
> > Maybe steel valve
> > guides will cause no problems,but I believe bronze guides
> > should be reamed to
> > the original size  after fitment
> > Marcel
> > -----Oorspronkelijk bericht-----
> > Van:
> > Fot [mailto:fot-bounces at autox.team.net] Namens Michael Moore
> > Verzonden:
> > donderdag 19 juni 2014 14:21
> > Aan: FOT
> > Onderwerp: [Fot] TR4 Valve Guide
> > Clearance
> >
> > Is there a recommended clearance for valve guides? I may have a
> > valve
> > sticking.
> >
> > Engine builder just put in oversized valves and new guides.
> > Thanks
> > Mike
> >
> > 62 TR4, Race car
> > 63 TR4, Street car
> >
> > Mike & Becky Moore
> > 6050 Ruhl
> > Road
> > Fairview, PA 16415
> >
> > [demime 1.01d removed an attachment of type image/gif
> > which had a name of
> > image001.gif]
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