I am getting water into my LU. The seal looks good, but I'm betting on it being bad. I need to order new seals anyway. Going to pull the entire drive and go through it. It's a 1974 stern drive and I don't know when the last time it was servicedIt probably damaged the real seals
That's one of the better reasons to pull your prop at least once annually. To apply grease to the shaft - AND - check for "debris" around shaft in the area of the seals.
A gob that big has likely been collecting for a while....
Horrible.
It's actually not unknown for local fisherman (who detest speedboats and jet skis) to deliberately plant loads of line in the water, at popular hot spots where I boat. Horrible.