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Join Date: Oct 2005
Location: In the Woods Pa
Re: 75 evinrude leaking oil
Sounds like the line got in and ground up the prop shaft seal. taking the lower unit apart can be 'interesting'. If you have never done complex outboard service you would be better with a dealer. Parts should be available, but easier for the dealer to get than you, 1975 is 35 years old.
Other seals and gaskets could also cause this, but I'm relating it to the fishing line.
Usually this is caused by a lower seal leaking and letting water into the casting. Then over the winter the water freezes and expands to crack the lower unit housing casting. but if this just happened, hot weather. But still check the lower hoousing casting closely.
As long as the lower prop housing is being taken apart, on a motor this old, I'd change all the shaft seals and the gaskets.
I'd also suggest a professional as the shaft can have shims to keep it aligned properly and if not in alignment it will vibrate and ruin the two lower prop shaft bearings.