<VV> Viton crank seals

[BBRT]

I have read but can't recall where, that Viton is NOT good for dynamic 
sealing. My experience confrms this re bell housing seals. I will not use 
them in the future for either end of crankshaft.

Chuck S
BBRT
Fredericksburg, VA
----- Original Message ----- 
From: "kevin nash" >>
>>
>> Over at the Corvair Forum, members have had problems with the Viton main
>> crankshaft seals, while one major Corvair shop has used Viton crank seals 
>> for
>>  years and never had a problem or failure.
>>
>> What are your experiences with these seals?
>>
>> Regards,
>> Bob Helt
>>
> Bob-I've used both Polyacrilate seals and Viton seals on both the 
> bellhousing and balancer end- both types of materials leaked on the 
> bellhousing end, neitherleaked on the balancer end. I've used the same 
> crank and crank gear for the various seals, as the seal surface has always 
> looked "perfect" to me. I had absolutelyno bellhousing leaks before I'd 
> rebuilt the engine, but after rebuilding, it leaks, and the seal material 
> choice hasnt made any difference at all! Probably, in my case,the 
> difference between it leaking and not leaking was that when I did the 
> re-build, I polished the seal surface, and did not get the surface finish 
> correct. Next timeI get in there to deal with that seal I'm going to put a 
> oil slinger on the crank shoulder (as is shown in some early corvair shop 
> manuals), plus a seal sleeve.There should not be anymore reasons for that 
> seal to leak, no matter what seal I use!Kevin Nash63 Spyder, daily driver
> _______________________________________________