[Fot] TR4 Valve Guide Clearance

[Marcel Van Mulders]

Ed, 
I bought the cylinderhead from an englishman, Jon Ellison, before that I had
one from Racetorations, both with bronze valve guides.
I don't know who actually did the work on these cylinderheads. 
When bronze guides are being installed, I believe the middle part gets
narrower because that part is clenched in the cylinderhead : this will not
show up by rocking the valve, so I wonder how the clearance is measured : it
can't be done by rocking the valve, maybe bij using an adjustable reaming
tool? Maybe I've been lucky but so far I didn't have any sticking valve. If
the diameter of the bronze guides is reamed after fitting, to the original
diameter as it was before fitting, won't that be sufficient? Bronze alloy
guides must have advantages too, not only drawbacks?
Marcel

  _____  

Van: EDWARD BARNARD [mailto:edwardbarnard at prodigy.net] 
Verzonden: zaterdag 28 juni 2014 15:59
Aan: Marcel Van Mulders; 'Michael Moore'
CC: fot at autox.team.net
Onderwerp: Re: [Fot] TR4 Valve Guide Clearance


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] _______________________________________________
fot at autox.team.net

http://www.fot-racing.com/

Donate: http://www.team.net/donate.html
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
Unsubscribe/Manage:
http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be
_______________________________________________
fot at autox.team.net

http://www.fot-racing.com/

Donate: http://www.team.net/donate.html
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
Unsubscribe/Manage:
http://autox.team.net/mailman/options/fot/edwardbarnard@prodigy.net