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New Counter lower unit goes in reverse when throttle is in forward

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New Counter lower unit goes in reverse when throttle is in forward

Old 10-11-2020, 01:53 PM
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Default New Counter lower unit goes in reverse when throttle is in forward

Brand new lower unit from mercury stamped counter rotating and it goes in reverse when throttle is put into forward gear.
Anything Iím missing here other than itís a standard rotation and mercury got it wrong?

Iím calling them tomorrow but just want to make sure nothing else would cause this.
Old 10-11-2020, 02:03 PM
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It that based on observed direction of shaft rotation, or the resultant prop thrust?

If the latter, then incorrect prop. Just think in’.
Old 10-11-2020, 02:08 PM
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Which engine?
Old 10-11-2020, 02:09 PM
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Originally Posted by ocnslr View Post
It that based on observed direction of shaft rotation, or the resultant prop thrust?

If the latter, then incorrect prop. Just think iní.
Installed the new lower my brother ran the boat today and said itís going in reverse when he puts the port in forward. A standard rotating prop on a counter rotating lower unit in forward gear should still make the boat go forward Iím sure. So even if that was the mistake it should still not go in reverse.

When he put it in reverse the boat went forward.

Old 10-11-2020, 02:10 PM
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Originally Posted by tangent70 View Post
Which engine?
Mercury 300xs with fleet master gear cases.
Old 10-11-2020, 02:21 PM
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Originally Posted by Pipo6007 View Post
Installed the new lower my brother ran the boat today and said itís going in reverse when he puts the port in forward. A standard rotating prop on a counter rotating lower unit in forward gear should still make the boat go forward Iím sure. So even if that was the mistake it should still not go in reverse.

When he put it in reverse the boat went forward.
are you saying a standard prop is fitted to the counter rotation gear case? I think you are.....just think about that for a minute.
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Old 10-11-2020, 02:26 PM
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Counter rotation gearcases on most Mercurys need to have the shift function reversed at the control. In other words, change from push/pull to pull/push. It’s a simple switch in the control itself.
Old 10-11-2020, 02:27 PM
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Originally Posted by noelm View Post
are you saying a standard prop is fitted to the counter rotation gear case? I think you are.....just think about that for a minute.
No not saying that. Was explaining that even if that was the problem the boat will still go forward. The starboard engine works fine. New port lower unit is doing the opposite of what it should be doing. Same props being used for 10 years.



Last edited by Pipo6007; 10-11-2020 at 02:29 PM. Reason: Adding picture
Old 10-11-2020, 02:32 PM
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Originally Posted by Tom W Clark View Post
Counter rotation gearcases on most Mercurys need to have the shift function reversed at the control. In other words, change from push/pull to pull/push. Itís a simple switch in the control itself.
These are mechanical controls. Pulled the older lower while in neutral and put the new one back in while in neutral.
Old 10-11-2020, 02:39 PM
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Originally Posted by Pipo6007 View Post
Installed the new lower my brother ran the boat today and said itís going in reverse when he puts the port in forward. A standard rotating prop on a counter rotating lower unit in forward gear should still make the boat go forward Iím sure. So even if that was the mistake it should still not go in reverse.

When he put it in reverse the boat went forward.
If you have a standard rotation prop on a counter rotating gearcase, and shift into forward, you would be experiencing the same effect as a standard rotating prop on a standard gearcase shifted into reverse. That result would be the boat moving in reverse.

Should be easy enough to confirm. Just look at the rotation on the propeller when the throttle is advanced to forward.


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Old 10-11-2020, 02:47 PM
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Originally Posted by jfbetz View Post
If you have a standard rotation prop on a counter rotating gearcase, and shift into forward, you would be experiencing the same effect as a standard rotating prop on a standard gearcase shifted into reverse. That result would be the boat moving in reverse.

Should be easy enough to confirm. Just look at the rotation on the propeller when the throttle is advanced to forward.
Picture I posted shows the props are installed correctly. Leading edges are where they should be. So itís not the case here. Just wondering if mercury simply mislabeled this counter rotating gearcase and sent me the wrong rotation.
Old 10-11-2020, 02:48 PM
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That's how it reads, but OP says he didn't say/type/mean that, so who knows?
Old 10-11-2020, 02:52 PM
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Originally Posted by noelm View Post
That's how it reads, but OP says he didn't say/type/mean that, so who knows?
Picture above of props and lower units.

Again I was just saying even ďifĒ the props were switched during install the boat ďshouldĒ still go forward. But thatís not the case so letís move on to the original question.
Old 10-11-2020, 03:14 PM
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OK, we will move on, but you are bamboozling us and yourself with your prop reasoning, but leave that behind, let's assume the controls have not been played with, the original gearcase was indeed a counter rotator (and not a bodged up standard operating backwards) then it seems the gear case is indeed labeled wrong.
Old 10-11-2020, 03:16 PM
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Just to add, I personally don't know of any way to distinguish a counter from a standard without some work pulling it to bits again.
Old 10-11-2020, 03:16 PM
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Wrong direction prop on lower. I picked up a buddies boat after service and the thing about went into the forks when I went to pull away. Swapped props.
Old 10-11-2020, 03:27 PM
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Originally Posted by noelm View Post
OK, we will move on, but you are bamboozling us and yourself with your prop reasoning, but leave that behind, let's assume the controls have not been played with, the original gearcase was indeed a counter rotator (and not a bodged up standard operating backwards) then it seems the gear case is indeed labeled wrong.
Thatís the current conclusion. Your assumptions are correct. I will have to call mercury racing tomorrow to see how they could have messed that one up.


Originally Posted by noelm View Post
Just to add, I personally don't know of any way to distinguish a counter from a standard without some work pulling it to bits again.
Yup thatís what I figured. Just sucks to be down and not able to use the boat.

Originally Posted by Wickedfisha View Post
Wrong direction prop on lower. I picked up a buddies boat after service and the thing about went into the forks when I went to pull away. Swapped props.
Canít be because the starboard works perfect. Props have not changed and have been using them for about 10 years. 1 lower was serviced and the other was purchased brand new. Old one was marked as CXL and new one is marked as CXL.
Old 10-11-2020, 03:37 PM
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Your 100% positive they put the same props back on? Iv seen a triple setup that had different gear case ratios across the spread too. Weird.
Old 10-11-2020, 05:08 PM
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Friend worked at Broward building multi-million$ yachts, with very expensive engines/transmissions. They did get one transmission assembled for the wrong rotation from what the label said. Put it in the water, it was pretty obvious. Lots of worried builders thinking they ran the controls wrong, but after checking everything possible, the transmission was wrong. Had to pull the new boat apart and take it out. Happens.
Old 10-11-2020, 06:17 PM
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I would shift the engine into forward and confirm the propeller turns counter clockwise.
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