Ed Anderson wrote:

 Thanks Charles,
     Will ask Kathy to get me the part number.  Yes, your drive has one more
fitting than mine. As I was talking my PSRU off the bell housing, I noticed
in this cooler weather that the 20-50 weight oil does seem very thick and
looks like it could shoulder its way past the seal lips.  I had not flown my
aircraft since October and perhaps sitting that long without running
hardened the seal.

  In any case, I removed old seal, turns out I must have not pounded it into
the hole all the way on my last replacement as about 1/8" of the metal cup
of the seal was protruding out from the bell housing hole.  This could have
contributed to the leak by causeing the lips of the seal to ride too high up
the shoulder of the drive.

   Also, I moved the oil returning fitting on my oil pan down about 8" which
now places it slight below the bottom of the PSRU drain. So hopefully this
will help.  If I still blow oil past the seal, it will go to the scavenger
pump.

  Again, Charlies, thanks for all the info on your PSRU and on the
machinst..  By the way what make and weight of oil do you use in your
engine??

Ed

 
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