Jon. here's work-around to avoid modifying the seal. A 3 7/8" Speedy-Sleeve on the crankshaft hub will increase its diameter around .010" and help the seal do its job. It will also restore the surface with super smooth stainless steel for the best sealing.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!