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I have a 1987 mercury 9.9 outboard drive problems

I have a 1987 mercury 9.9 outboard on a 12' boat. As I was towing my not-so-good sailor/daughter's sailboat to shore with it, I increased throttle speed a bit and the engine revved high with no power to the propeller. Got it to shore OK after that at lower speed. Next time I used it the engine started & ran fine, reverse worked fine but at above 1/3 throttle I get high revs but no power to the prop again. Below one third throttle the prop can push the boat. The lower housing grease seems fine (except for some red spots in it and the prop did not seem loose when I pulled on it by hand.Have not put a wrench to the prop yet. Thanks

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The inside of the prop has a rubber between the prop itself and the inside splines to act as a shock absorber,say if you were to hit a rock. that rubber had spun out and the splines are turning inside the prop. the prop is screwed. seen it 100 times before.

Posted on Apr 23, 2009

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We were on the way to the lake when we lost a tire on the boat trailer got that fixed and got on the water the boat seemed to run fine when suddenly we felt a **** like we hit something now the engine wont stay running but engine will run out of water in neutral

Posted on Jul 03, 2011

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Kevin,
Here you go. This is for the 90-115-140 hp models 1980 (ser# 5594657) and up years.

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