Good day!
My local Corvair expert rebuilt an early 4-speed transmission that we just put into my customer's Rampside. Mike has been working on Corvairs professionally since the 60s. His work is top-notch. We are battling a shift shaft seal issue. He has an inventory of them. We are now on the second from his stock that leaks. I was thinking that maybe someone would have a NOS or Made in USA replacement that they would sell me? Mike is investigating same through his channels.
Let me know what you have.

THANKS VERY MUCH!

Enjoy the Corvair!

Paul Sergeant
CORSA Central Division Director / CORSA Treasurer
Lee's Summit, MO
CORSA since 1975
Member – HACOA, Corvair Minnesota, CORSA, Little Indians, POCI

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Are you sure there's not something else wrong I've been rebuilding early 4spd transmissions for years with gasket/seal sets from Clark's. I have never had an issue with them.


Ray Johnson Villa Park IL 63 Spyder Conv. 140 EFI

Both Mike and I have gone over it carefully and the leak is definitely at the shifter shaft. We cannot find any burrs or imperfections anywhere in the vicinity. There is no oil above the shaft exit that would run down onto the shaft. We are a bit stumped. I thought if I could find a different seal maybe he got a bad batch.

Thanks!

Enjoy the Corvair!

Paul Sergeant
CORSA Central Division Director / CORSA Treasurer
Lee's Summit, MO
CORSA since 1975
Member – HACOA, Corvair Minnesota, CORSA, Little Indians, POCI

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Are you using any sealer on the outside of the seal? You should use gasacinch or permatex type 2.

How are you passing it over the shifter pin holes? I put 2 wraps of scotch tape over them.

"Run She May, Shine She Must"
Been Aircooled Since 1973
Northwest Ohio 45840

The Timken/National part number for the shift shaft seal is 472705 (Buna/nitrile rubber) or 472705V (Viton/fluoroelastomer). These come coated with the red "Redicoat" that should help seal the outside..

You guys have probably checked this already, but have you measured the diameter of the shift shaft where the seal rides vs an untouched area? Maybe there's enough wear that the lip doesn't contact well enough anymore.

Nick

Louisville, KY, US


64 Greenbrier



Edited 1 time(s). Last edit at 03/10/2023 10:25PM by TimeMachineParadox.

Good morning!
He did put Permatex around the outside of the seal before installation. Good idea of putting the tape around the hole in the shaft before installation.

I think his seals came from Clark's but cannot be sure. I have the old one here and it does look like a double lip seal.

Thanks for the input.

Enjoy the Corvair!

Paul Sergeant
CORSA Central Division Director / CORSA Treasurer
Lee's Summit, MO
CORSA since 1975
Member – HACOA, Corvair Minnesota, CORSA, Little Indians, POCI

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