Oil leak through Prop

[Gembo]

My 1975 Evinrude 75hp leaks oil through the prop when the motor is off in the down position, I have just noticed this and haven't had it in the water yet. I did run it with a flush kit and the leak did not appear to be excessive. What causes this and how do I fix it? Also the prop nut sheared off at the front of the thrust bushing, I drilled out the shaft and tapped a 3/8" x 3/4" bolt and it holds the prop tight against the shaft with a locknut and washer. Has anybody had this experience before, and does this sound like a decent fix?

 

[kevlar3000]

Re: Oil leak through Prop

I justhad the same symptoms in my boat, the seals in the lower unit were shot, not a mechanic, so paid the 300.00 for the re-seal.... I am not sure about your 2nd question....

 

[Walter]

Re: Oil leak through Prop

I'm with Kev...I have never heard of your "fix" for the prop nut...<br /><br />As far as the seal failing...I've been told that something as simple as getting fishing line caught up in the prop can take out a shaft seal. But I think most would agree it might be most cost effective, not to mention most reliable in the long run, to have both problems cured in the "prop"-er fashion! In other words...fix it right!! Good luck!!

 

[Fouled Plug]

Re: Oil leak through Prop

Is it gear oil leaking, or just exhaust/water mix you are seeing? If it's coming from the center of the prop it may just be partially burned 2 stroke oil.<br /><br />------------------<br />I'm going to invent a TCW3/citronella oil blend and make a fortune!

 

[Gembo]

Re: Oil leak through Prop

Thanks for the replies, motor is running fine, I did find some fishing line around seal right behind prop. No apparent leak now, checked lower unit oil and it was full after running the motor for aboutt 6 hrs <br />thursday..My fix works also, saved about $400 doing it that way, the bolt should stay as good as the original.