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Mercury 115 problems

I have a 1990 mercury 115. Goes forward fine, but grinds in reverse. The prop turns, but only slowly even if you idle up.

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This could me that reverse gear is not fully engaged.Adjustment on the cables is needed.Take the cowlings off.With the motor not running,move the throttle/gear selector into forward and reverse.You will see where the cables move in the engine area.Note which way the cable moves the selector when reverse is selected.Do this next bit from inside the boat.Hook up the flusher to the motor and start it.Select reverse.When you hear the grinding,push the selector by hand in the direction of travel.It should engage the gear fully.You will see the adjustment threads on the control cables.Move to suit.Hope this helps

Posted on Aug 01, 2009

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Posted on Jan 02, 2017

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Seems like your are describing a outboard motor. If so, the Boat section of Fixya may have more experts that you need. You would want to avoid turning any screws on the carburetor body. The externals on the linkage have some adjustments like throttle stops.

The linkage on boat shift mechanisms are tempermental. They usually combine 2 functions on 1 control lever. They are synchronized that when the transmission shifts from neutral to forward and neutral to reverse the idle speed is low. This keeps the gears from grinding and takes the shock out of the shifting process.

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This also means you can over-rev the engine by having the wrong prop on the boat. There are engine rpm "stops" for the high end too, but some just rely on using the correct prop. As what you may be experiencing with a "stall" can be brought on by

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So when you shift--- snap in in gear-- do not ease it in gear, as it will wear the dog out faster.

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If it is a manual shift, you may have a connector screw loose or missing. There is a posiability the shift cam in the lower is worn, or the center rod running inside the prop shaft is worn to the point it won't catch the clutch dogd. (shift quick/ don't rattle into gear.)

Most mercurys natural state was in forward gear, as they ate their clutch dogs you could get a little more service from them by under adjusting reverse- giving forward a little more life. It was a marginal fix and could end up with your problem.

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