After getting off a sandbar boat will only go slow

[tu1aher1]

Hello all,

I have a 84 Hammond with a Mercruiser 140 3.0 Alpha One Gen One. I was out on the lake and got stuck on a sandbar. I raised the outdrive up and after turning the wheel back and forth going forward and reverse I finally got it out. I raised the outdrive pretty far but I was a ware of not raising it too far not to damage the u joint. My trim sender is not working but I never heard any problems when I raised it.

Anyway the boat seemed to run fine for about 5 min then I started losing power from the outdrive. I could put it in neutral and the engine would run fine so I know it has to be the outdrive. It started getting worse until I could only run it at the speed you get when you first put it in forward gear which is pretty slow. But it would have no problem at this speed forward or reverse. If I tried to give it more gas the out drive acts like it starts losing power so I quickly bring it back to the speed you get when you first put it in gear.

The engine stays nice and cool the whole time so I don't think the outdrive is full of sand or mud. Did I loose my outdrive? I am a pretty good mechanic. Would it be worth it to rebuild the outdrive? Any help on what it could be would be very much appreciated.

 

[TD_Maker]

I would bet when you hit the sandbar, you spun the prop. Check to see if the prop hub is slipping preventing it from turning faster when you advance the throttle. Or, just put on a different known good prop and see if that does the trick.