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Couesnon valve guides



 
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trpthrld
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PostPosted: Thu May 12, 2022 12:19 pm    Post subject: Couesnon valve guides Reply with quote

Loves my Queenie, hate the noise from the metal valve guides.

Does anyone know of sources for quieter or maybe plastic guides?
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Jon Arnold
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PostPosted: Thu May 12, 2022 1:32 pm    Post subject: Reply with quote

Great question. Wonder if Osmun or Charlie Melk could help you out?
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yourbrass
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PostPosted: Thu May 12, 2022 3:01 pm    Post subject: Reply with quote

My recollection is that by the 70's, when the last Couesnons were made as "Elkhart" stencils, they had changed the guides to plastic. I think that's the way mine was.
But they also changed the top of the piston to accommodate these larger plastic guides.
Maybe some kind of 3-D printed guide? That's being done right now. I saw guides being made this way at a repair clinic in January 2020.

-Lionel
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OldSchoolEuph
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PostPosted: Fri May 13, 2022 4:11 am    Post subject: Reply with quote

Have you tried contacting PGM Couesnon? They may not have made them for a long time, but they might know who carries suitable parts.
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trpthrld
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PostPosted: Fri May 13, 2022 11:16 am    Post subject: Reply with quote

Update:

Called Osmun...no joy.

Sent an email to PGM - awaiting a reply.

Called Charlie. Very nice guy. No immediate joy BUT he said is son works for a plastics factory & now that I'd tickled his brain on this subject, he said he'd give it some thought and discuss with his son.

So there's hope yet!
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JohnHou
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PostPosted: Fri May 13, 2022 11:46 am    Post subject: Reply with quote

I'm willing to help you out if you're interested.

I do a good amount of modeling and 3D printing for work and I'm actually printing out some guides tonight that I modeled for my 60s Buescher Aristocrat that has lots of rotational play.

Assuming the Couesnon guides aren't unexpectedly complicated it shouldn't be a big deal to model and print a couple of sets with different tolerances in PLA for you to test fit.

Happy to work out details if you want to send me DM.

John
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Wondra
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PostPosted: Sat May 14, 2022 8:09 am    Post subject: Reply with quote

Tim,

Please post what you find - I'd like a set as well!

Dave
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Ed Kennedy
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PostPosted: Sat May 14, 2022 10:49 am    Post subject: Reply with quote

They can be machined out of delrin rod the same as brass or nickel. Since you are in NYC I imagine that Josh Landress could help.
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yourbrass
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PostPosted: Sun May 15, 2022 8:23 am    Post subject: Reply with quote

I'm betting the 3-D printing method is the way to go. Those guides are thin metal clips that hook into the top and side of the piston, sort of a truncated "U" shape. They look like stamped and bent metal.

If a plastic as tough as Delrin could be printed, maybe it will work. Are there plastics that could be printed flat and then bent?

Please let us know what happens, fascinating stuff.
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VetPsychWars
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PostPosted: Mon May 16, 2022 5:51 pm    Post subject: Reply with quote

JohnHou wrote:
I'm willing to help you out if you're interested.

I do a good amount of modeling and 3D printing for work and I'm actually printing out some guides tonight that I modeled for my 60s Buescher Aristocrat that has lots of rotational play.

A little off the subject, but pull your second-valve slide and rotate the valve, and then pump it up and down a few times and you'll see it realigns on its own.

My theory is that the friction is lower when the holes line up and it "seeks" that position.
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