Guys, This may have been said before but here goes again. There are two things that seals need the most. 1; a GREAT surface finish. 2; lubrication/or compatable surface. Most often seals want a very hard surface around 50-60Rc and just a little oil. Many people don't realize if you have a minor oil leak you need to be SURE the finish of the sealing surface isn't at fault. The most common callout is 8-16 RMS. This is almost a mirror polish. If you can feel a ridge with your fingernail your new seal is doomed. You can try to space the seal if possible to run on a different spot on the shaft.
If there is atmospheric or pumping pressure inside the housing it just makes things worse. Bill Jepson

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