There is a tool used to measure the ID of the bore, and they should
be reamed to size after installation. Stickimg valves is a bigger
problem if you have enough lift in the cam that a stuck valve will
hit the piston. Results are quickly very disastrous then.
Tony
At 03:07 PM 6/28/2014, Marcel Van Mulders wrote:
>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@prodigy.net]
>Verzonden: zaterdag 28 juni 2014 15:59
>Aan: Marcel Van Mulders; 'Michael Moore'
>CC: fot@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@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@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
>
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