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Corvair Center Forum :
Corvair Center Phorum - presented by CORSA
![]() Corvair Center Valve Seals Posted by:
MonzaDave
() Date: March 16, 2023 11:22AM I posted this on Corvair Owners Group, but it will probably be deleted as "vendor bashing" and probably here too. But . . . I ordered Teflon valve seals from Clark's. They wouldn't fit. Valve stems measured 0.341, inner diameter of seals measured 0.305. Clark's tech guy told me that the Teflon seals fit hard. I know. But Teflon doesn't stretch 0.036 -- I have a broken seal to prove it. He said I could return the unbroken ones. Viton seals on order from John Sweet. Go with Viton -- from Clark's or wherever. Dave Keillor Rochester, MN Re: Valve Seals Posted by:
REM654DPG
() Date: March 16, 2023 12:16PM Sounds like you got some 5/16 stem seals instead of the 11/32. Clarks is good with their return policy but maybe they don't know these seals are the wrong ones. I prefer the vitons myself but I'm sure you know not to use them on the exhaust side. Regan Metcalf Shelton, WA Re: Valve Seals Posted by:
MonzaDave
() Date: March 16, 2023 01:18PM REM654DPG Wrote: ------------------------------------------------------- > Sounds like you got some 5/16 stem seals instead of the 11/32. Clarks is good with their return policy but maybe they don't know these seals are the wrong ones. > > I prefer the vitons myself but I'm sure you know not to use them on the exhaust side. Yes,intake only. Their tech guy said I could return them for credit and order Viton. I told him I no longer had a full set -- i'd broken at least one. He said they'd refund for the five good ones. I had expected they would want to check their stock and just send me a set of Viton. Nope, he essentially told be to push harder. I gave him all the measurements including the 0.046 interference. And the fact that this is a 25K engine that's never been touched -- I bought the car new. I feel I got blown off -- quite possibly to Clark's detriment (bad parts). Dave Keillor Rochester, MN Re: Valve Seals Posted by:
wittsend
() Date: March 16, 2023 01:36PM Been there..., done that. ![]() Edited 1 time(s). Last edit at 03/16/2023 01:36PM by wittsend. Attachments: Re: Valve Seals Posted by:
MonzaDave
() Date: March 16, 2023 02:28PM wittsend Wrote: ------------------------------------------------------- > Been there..., done that. ![]() I almost certainly received seals for 5/6" stems, not 11/16". I talked to Barb at Clark's and she will check their stock and left me know. Their "tech-guy" was worthless and fell well short of what I would have expected. I gave him all my measurements -- and the fact that this is a 25K, never been touched engine. Dave Keillor Rochester, MN Re: Valve Seals Posted by:
jbyenko77
() Date: March 16, 2023 02:51PM I had the same problem 5/16 Teflon seals from Clark’s instead of 11/32 Jeff ballard Camarillo ca Re: Valve Seals Posted by:
Frank DuVal
() Date: March 16, 2023 03:20PM I had the same problem. In 1988? ![]() I went with Vitons ever since! I still have some of the Teflon seals in the small parts drawer (pack rat). Frank DuVal Fredericksburg, VA Re: Valve Seals Posted by:
MonzaDave
() Date: March 16, 2023 04:47PM Clark's measure some of the seals in stock, and found them to be 0.310-0.315 (mine was 0.305). This seems a bit small for a 11/32 stem given the elasticity of Teflon. I tried mine on a piece of 5/16" drill stock (no burrs) that miked 0.311. It was a tight fit, but I could push it on with some effort. My conclusion is that either I got 5/16" seals or their vendor has a tolerance problem. No more Teflon seals for me. Dave Keillor Rochester, MN Re: Valve Seals Posted by:
jjohnsonjo
() Date: March 16, 2023 05:27PM No seals at all for me. Horizontal valves don't have oil running down on them. Turbo heads get Vairy HOT, guides need all the help they cab get. My 2 cents J.O. 65 Corsa Turbo Vert 79 Honda XL 500S 69 Honda CL 160 D 2010 BMW F 650 GS 2003 Bounder 36D 2023 KIA K5 GT/GT1 turbo-AKA ZIPPY II (wife,s car) 69 Newport Holiday Sailboat Baja 150 dune buggy cart Coleman HS 500 UTV 2016 KIA Sorento SXL Turbo Bethlehem,Pa ![]() ![]() Re: Valve Seals Posted by:
v8vair
() Date: March 16, 2023 09:29PM I use seals on intake and exhaust, it ain’t the 60s, modern seals let the oil in and keep the exhaust from forcing the oil out. They actually keep the exhaust guides lubed and during overlap on a performance engine keep oil out of the chamber. ![]() 1964 Bill Thomas Monza Replica Racer 1964 Spyder Street Car 1998 Honda Prelude Dirt track car 1967 Crown V8 under construction Mike Levine Cumming Georgia North of Atlanta Re: Valve Seals Posted by:
zarfnober
() Date: March 17, 2023 06:37AM v8vair Wrote: ------------------------------------------------------- > I use seals on intake and exhaust, it ain’t the 60s, modern seals let the oil in and keep the exhaust from forcing the oil out. They actually keep the exhaust guides lubed and during overlap on a performance engine keep oil out of the chamber. ![]() Hey mike, you using seals on intake and exhaust on your Spyder? I’m hoping to get an engine together soon, I know there are both schools of thought on valve seals, just wondering others experience with seals on both, thanks. Rocco 65 EFI Turbo Corsa YS113 Barboursville, Va Re: Valve Seals Posted by:
vairmech
() Date: March 17, 2023 07:37AM I will ot ever again use the teflon valve stem seals! Although with the teflon the install procedure is the key. You CANNOT just push them on or the top will break off just like Dave experienced. When I discovered the Viton lip seals for the valve many years ago I never looked back. Ken Hand Handy Car Care 248 613 8586 Vairmech@aol.com Re: Valve Seals Posted by:
JimBrandberg
() Date: March 17, 2023 07:47AM I too have teflon seals in my drawer that caused much angst before going on to something else. I don't know where they came from, I've got a lot of stuff from other people's collections. I've probably had them for 20 years and should just go ahead and throw them out already. I'm getting better at that sort of thing, bah humbug. Jim Brandberg Isanti, MN CorvairRepair.com ![]() Re: Valve Seals Posted by:
jasvair
() Date: March 17, 2023 08:26PM Like the people say use my Viton intake valve stem seals. I will have a one week sale on them for $10 a set of 6 and $4.50 shipping. I do take Paypal at js189@zoominternet.net. John Sweet John's Corvair Parts Re: Valve Seals Posted by:
MonzaDave
() Date: March 18, 2023 09:01AM jasvair Wrote: ------------------------------------------------------- > Like the people say use my Viton intake valve stem seals. I will have a one week sale on them for $10 a set of 6 and $4.50 shipping. I do take Paypal at js189@zoominternet.net. > > John Sweet > John's Corvair Parts I already ordered mine through your ebay store. In the future, is there a way to order direct so you can avoid the e-bay charges, or would you prefer using ebay? Dave Keillor Rochester, MN Re: Valve Seals Posted by:
v8vair
() Date: March 18, 2023 09:26AM [www.autoblueprint.com] 1964 Bill Thomas Monza Replica Racer 1964 Spyder Street Car 1998 Honda Prelude Dirt track car 1967 Crown V8 under construction Mike Levine Cumming Georgia North of Atlanta Re: Valve Seals Posted by:
joelsplace
() Date: March 19, 2023 10:37AM Basic article. I wish it described how seals leak the proper amount of oil. It loses some credibility by claiming different seals materials are identified by color. I wish that was true. Joel Northlake, TX 5 Ultravans, 145 Corvairs and counting... ![]() Sorry, only registered users may post in this forum. |