Reply To: Top shaft seal leaking of 1967 18hp Evinrude

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October 22, 2022 at 9:15 am #268033
Evinrude 25
Participant

    I got the motor a month ago. Everything looks original and the power head looks never opened. It is idling nice but base on my reading, 18 hp has common problem with the top shaft seal so I decided to check it out and want to change the seal (not expensive part). Then I found this leakage. I know for sure that is the leak of where the recess on aluminum casting (picture). I have never done anything on it yet it got 100 psi /95 psi of compression test. So if it is a O-ring leak, I may open it up and change the top seal as well as the O-ring.