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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, 07:48 PM
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Originally Posted by Wickedfisha View Post
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.
Yes I put the standard lower back on myself and works perfect. Forward throttle and boat goes forward. Reverse throttle and boat goes in reverse. The new counter rotating was shipped from mercury warehouse in Atlanta with no prop but completely assembled with lower unit oil and all. I picked it up put my same counter prop that was on the old one.

Originally Posted by 30West View Post
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.
I donít doubt that happened. People make mistakes. Just making sure I wasnít missing something here.

Originally Posted by tangent70 View Post
I would shift the engine into forward and confirm the propeller turns counter clockwise.
Was this done?
Not but my brother sent me a video of him putting the throttle in reverse and the boat was heading forward into our marina. This has never happened before so Iím guessing Mercury made the mistake since there hasnít been any other valid explanation. Iím calling them tomorrow morning to see what the next step is.
Old 10-11-2020, 08:05 PM
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You replace a standard rotation unit with a counter rotation unit ? ??
Old 10-11-2020, 08:11 PM
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Originally Posted by prowlersfish View Post
You replace a standard rotation unit with a counter rotation unit ? ??
nope.
Old 10-11-2020, 08:21 PM
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Originally Posted by Pipo6007 View Post
nope.
Originally Posted by Pipo6007 View Post
Yes I put the standard lower back on myself and works perfect. .
Ok you said you put the standard one back on so I assumed you put a standard unit back on .
Old 10-11-2020, 08:26 PM
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Originally Posted by prowlersfish View Post
Ok you said you put the standard one back on so I assumed you put a standard unit back on .
I have twin engines. Standard is on the right (starboard) Counter is on the left (port).
Old 10-11-2020, 08:29 PM
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Originally Posted by prowlersfish View Post
Ok you said you put the standard one back on so I assumed you put a standard unit back on .
The rest of the paragraph explains what’s happening to the port. The standard engine is working fine.
Old 10-11-2020, 08:33 PM
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I'm out, so confused with terminology and explanations about right hand props still going forward on counter rotation boxes.
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Old 10-11-2020, 09:01 PM
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Originally Posted by noelm View Post
I'm out, so confused with terminology and explanations about right hand props still going forward on counter rotation boxes.
Okay, I have three or four engines and two are standard and one or two are counter. All of them spin one way or another. Trying to figure out which way they are spinning with reversing the props and shifting in different directions. Got it???

As basic as I can explain is the port motor (counter rotation) when engaged into forward gear makes the boat go in reverse.
Old 10-11-2020, 09:24 PM
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Originally Posted by Pipo6007 View Post
Okay, I have three or four engines and two are standard and one or two are counter. All of them spin one way or another. Trying to figure out which way they are spinning with reversing the props and shifting in different directions. Got it???

As basic as I can explain is the port motor (counter rotation) when engaged into forward gear makes the boat go in reverse.
if it goes backwards when you put it in forward gear and frontwards when you put it in reverse with a lefthanded prop then itís a right handed standard rotation lower
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Old 10-11-2020, 11:07 PM
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Tom gave you the answer. Flip the linkage in the controller. There should be directions in the manual of how to do that.
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Old 10-12-2020, 01:28 AM
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I have seen a maiden launch of a nice 30 ' boat with a pair of standard and counter O/B's pinned on the transom that went forward when the previously happy owner "reversed " from the Travellift well. But in that case it was a new installation , the lower units were correct for their sides but the mechanical control cables were pooched incorrectly to one engine. The cables were reconnected correctly before long and all was well.

But... your is not a new launch and the still-in-place motor in question should not have had any controls disconnected unless something was requested in that department . Your pic shows the correct prop if it was taken with the new L/U.
So in the likely event those Merc 300s' Fleet Master gear cases will not accept full power in both F & R , then yes , it sure sounds like the new L/U is labeled or built wrong and you need to swap it back out with a correct counter -rotation unit. I think most O/B will not take high thrust in R without severe damage, but can't hurt to check with your engine mfgr about that model. I think some Suzuki models may be rare exceptions as they reportedly can be configured either rotation with a switch or some-such non-mechanical easy change on the engine.

I expect Merc would mention 'full-reversing " re those l/u's if they could handle that , but they don't . So I wouldn't mess with the cables if they are still as they were previously. That could make things worse .
https://www.mercuryracing.com/outboa...-applications/
Your brother isn't by any chance a prankster , is he?

Old 10-12-2020, 06:41 AM
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I'm thinking the shifter gear shaft on the lower unit was not in the proper position when you installed the lower unit so when you put it in forward the lower unit selector shaft is putting it in reverse, this happened to me one time when I dropped the lower unit to change the water pump impeller, the gear selector shaft got moved so when I reinstalled the lower unit and shifted into forward the prop spun in reverse.
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Old 10-12-2020, 07:03 AM
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Has he tried dropping the lower and making sure it didn't get bumped into gear when it was going back together? I know that Mercury recommends being in forward gear when reassembling, but I've done it in neutral plenty without issue. On the 90 I had last the shift shaft stayed up in the leg and coupled at the lower. Worth a try at least. Did he take the controls apart replacing a cable or anything or just the lower replacement?
Old 10-12-2020, 07:13 AM
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Is it possible your old unit was not reversed, they flipped the controls instead?
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Old 10-12-2020, 07:28 AM
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Drop the lower unit, turn the input shaft by hand and check the rotation of the prop and gear shift selector shaft position, visually confirm the proper operation of gearshift control and that it matches the gearshift selector shaft and prop rotation, seems to me a pretty easy way to find out were the problem is.
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Old 10-12-2020, 09:12 AM
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This would not be the first lower unit that Mercury built as a "standard" rotation but stamped as a "counter". If nothing else about your setup has changed and all you did was swap the lower units, then an improperly labeled lower unit is your cause.
Old 10-12-2020, 12:32 PM
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I spoke to mercury over the phone and they said to remove the lower unit and manually put it into forward gear. Then turn the main shaft clockwise. If the prop spins clockwise then they mislabeled the lower unit. Have the dealer ship it back to exchange it.
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Old 10-12-2020, 01:37 PM
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Originally Posted by Pipo6007 View Post
I spoke to mercury over the phone and they said to remove the lower unit and manually put it into forward gear. Then turn the main shaft clockwise. If the prop spins clockwise then they mislabeled the lower unit. Have the dealer ship it back to exchange it.
Will they pay the dealer to remove & return the wrong one and install the new one?
Old 10-12-2020, 04:17 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.
This - I installed a new counter LU last year and the shift pattern on the newer LU's has been reversed. You need to reverse the shift pattern at your control box
Old 10-12-2020, 05:48 PM
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Originally Posted by rdiesel01 View Post
This - I installed a new counter LU last year and the shift pattern on the newer LU's has been reversed. You need to reverse the shift pattern at your control box
That sounds interesting. Is this something new? Was it an outboard? This new lower unit says it was built in December of 2019. Are yours mechanical controls?

I can call mercury tomorrow to see what they say about that.

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