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  1. Banned
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    #21
    Quote Originally Posted by vatreefarmer View Post
    In theory, it's possible that the prop could actually spin in reverse direction. If that were to occur, the engine would actually produce gas. On a long tow (in excess of 60 miles) the gasoline produced would be considered to be untaxed and in excess of what is legally allowed for self consumption. I'm sure others will be along who can speak more intelligently on the issue than I can, but I think both Federal and state fuel tax laws are in play.

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    #22
    When I putting it on the trailer ieave it in gear. That was the boat doesn't slip back. Walk to the front and clip it. Go back to the console and then it off leaving it in gear.

  3. Maybe one day........ TRCM's Avatar
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    #23
    Quote Originally Posted by rude150 View Post
    What if the prop does spin, while going down the road?
    You do have gear case oil in the lower unit, correct?

    Yes, but there would be no cooling for it, and the concern is it overheating.
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    #24
    Interesting...
    I have never seen a prop turning on a boat on the road. Well, except the one on a hitch receptacle cover I saw...
    Never thought about it as an issue. Both my main and kicker are tipped pretty good down the road. Neutral for me.

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    #25
    Neutral with a prop cover on always.

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    #26
    Quote Originally Posted by TRCM View Post
    Yes, but there would be no cooling for it, and the concern is it overheating.
    Nah, gears not engaged, just the prop shaft is turning. A little wear on the prop shaft bearings is all. Still I pull it in gear.

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    #27
    Neutral for me, and I use a SM Mercury. If it spins, it spins. Its in Neutral, wont hurt anything. Not like its gonna spin like a pinwheel or something.

  8. Maybe one day........ TRCM's Avatar
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    #28
    Quote Originally Posted by gehol View Post
    Nah, gears not engaged, just the prop shaft is turning. A little wear on the prop shaft bearings is all. Still I pull it in gear.

    Ha HA...agree or not, that was the reason I was told when I asked many years ago after seeing it in the owners manual.

    If the gears were engaged, it would turn the motor...that is NOT the concern as that is basically impossible.

    But the spinning shaft/bearings in the lower unit is, as it has no cooling if it isn't in the water. Remember, normally, the whole lower unit is submerged and running thru cooling water. Spinning in the air going down the road, no cooling water.
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  9. Member Macsimus's Avatar
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    #29
    Quote Originally Posted by vatreefarmer View Post
    In theory, it's possible that the prop could actually spin in reverse direction. If that were to occur, the engine would actually produce gas. On a long tow (in excess of 60 miles) the gasoline produced would be considered to be untaxed and in excess of what is legally allowed for self consumption. I'm sure others will be along who can speak more intelligently on the issue than I can, but I think both Federal and state fuel tax laws are in play.
    There was a time that I didn't fish but I cannot remember it.


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    #30
    So do you guys leave it in gear too when you jump up front and hop on the trolling motor?

    I don't see why this is a debate, as at the end of the day it doesn't really matter.

  11. Maybe one day........ TRCM's Avatar
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    #31
    Quote Originally Posted by artcarney_agr View Post
    So do you guys leave it in gear too when you jump up front and hop on the trolling motor?

    I don't see why this is a debate, as at the end of the day it doesn't really matter.

    Cuz someone said to do it (mercury) and none of us do...........

    And no, I don't put it in gear when trolling either, but if it spins then, it at least has water around it.
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  12. RIP Evinrude 1907-2020 JR19's Avatar
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    #32
    Over the years I have followed hundreds of boats being towed down the road. There was only two occasions I ever saw a prop spinning and on both occasions it was on a pontoon. In both those instances the motor was not trimmed up. It was hanging straight down so the prop had a unobstructed path and caught the full force of wind while being pulled down the road. Even then the prop was barely spinning at all. In fact it was more like it was barely turning...mabey 3-5 rpm. If you want to put your motor in gear then by all means do it but I see no need for it.

    As Art said the same thing happens when you jump on the trolling motor fishing...I have been on the back deck multiple times and had the person on the front kick the trolling motor on high to move to another spot. I have seen the prop spin when doing this and it's not a problem so my thought is why should it be a problem when towing?

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    #33
    Quote Originally Posted by TRCM View Post
    Cuz someone said to do it (mercury) and none of us do...........

    And no, I don't put it in gear when trolling either, but if it spins then, it at least has water around it.
    Think about it. There is no pressure on anything when it is free wheeling. You only need cooling when the gear set is under load. It is the load generating heat. The tiny amount of friction on the prop shaft bearings while submerged in oil is a non issue.
    Always while trolling to help prevent discarded line from wrapping the shaft.

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    #34
    How much cooling water does your truck differential have? It's a pretty similar gear set, using virtually the same oil.


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    #35
    Y'all are forgetting the main thing and why I think Mercury said put it in gear!
    If prop turns.....most don't but some do.........your turning a dry impeller!
    Turning a dry impeller is not good!

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    #36
    Quote Originally Posted by 5keepers2 View Post
    Y'all are forgetting the main thing and why I think Mercury said put it in gear!
    If prop turns.....most don't but some do.........your turning a dry impeller!
    Turning a dry impeller is not good!
    Are you sure about that? I thought it only turned when the big engine was on spinning the driveshaft and water pump - I can sit in neutral with the motor running and the impeller is turning with the water pump, but the prop sure isn't spinning.

    The prop is connected to the prop shaft........not the driveshaft.

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    #37
    Quote Originally Posted by artcarney_agr View Post
    Are you sure about that? I thought it only turned when the big engine was on spinning the driveshaft and water pump - I can sit in neutral with the motor running and the impeller is turning with the water pump, but the prop sure isn't spinning.

    The prop is connected to the prop shaft........not the driveshaft.
    Correct if the prop spinning could turn the impeller then if you turned your prop by hand when in neutral you would feel the resistance of the dry impeller in its housing.

  18. Maybe one day........ TRCM's Avatar
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    #38
    Quote Originally Posted by gehol View Post
    Think about it. There is no pressure on anything when it is free wheeling. You only need cooling when the gear set is under load. It is the load generating heat. The tiny amount of friction on the prop shaft bearings while submerged in oil is a non issue.
    Always while trolling to help prevent discarded line from wrapping the shaft.

    Dude...don't kill the messenger...I'm just relaying the info I was provided when I asked.

    Everyone who says it is no different spinning in the air vs water keeps forgetting the water is cooler.



    BTW, there is pressure on it, otherwise, it would not spin. It is moving thru the air, and the air is putting pressure on the blades, which is what makes it spin....granted, the load is much much less than when under power, but it is still a load none the less. There has to be pressure on it or it will not move/spin, and that includes the internal gears/bearings, not just the prop.


    Take a truck axle and put it under a trailer....pull it down the road....there will be no pressure on the pinion and ring gear, just on the wheel bearings out at the wheels, but the center section will still get hot.


    Quote Originally Posted by bassboy1 View Post
    How much cooling water does your truck differential have? It's a pretty similar gear set, using virtually the same oil.
    A truck axle is designed to be run with no cooling other than the air going past it (well, most axles are air cooled only), that is why it is made of steel or cast iron, not aluminum.

    Your lower unit is aluminum, and will heat up and expand much faster.
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    #39
    Quote Originally Posted by TRCM View Post
    .

    Your lower unit is aluminum, and will heat up and expand much faster.
    The reverse is true. Aluminum will dissipate heat (to the air, etc) much more efficiently than iron, so it will run cooler. Hence why heat sinks on computers are often aluminum.

    In reality, the amount of heat is immeasurable, and will probably be more affected by what color the gearcase is painted than anything else


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    #40
    Quote Originally Posted by TRCM View Post
    Dude...don't kill the messenger...I'm just relaying the info I was provided when I asked.

    Everyone who says it is no different spinning in the air vs water keeps forgetting the water is cooler.



    BTW, there is pressure on it, otherwise, it would not spin. It is moving thru the air, and the air is putting pressure on the blades, which is what makes it spin....granted, the load is much much less than when under power, but it is still a load none the less. There has to be pressure on it or it will not move/spin, and that includes the internal gears/bearings, not just the prop.


    Take a truck axle and put it under a trailer....pull it down the road....there will be no pressure on the pinion and ring gear, just on the wheel bearings out at the wheels, but the center section will still get hot.




    A truck axle is designed to be run with no cooling other than the air going past it (well, most axles are air cooled only), that is why it is made of steel or cast iron, not aluminum.

    Your lower unit is aluminum, and will heat up and expand much faster.
    Good grief. Under a trailer the gear set is engaged. Ring gear is turning the pinion. Even at that there will be very little heat in that scenario. On the prop it is not the load on the prop, which is miniscule, I am talking about. On a lower unit in neutral the gears don't even touch each other. There is nothing to generate heat other than the minute amount of friction in the shaft bearings while submerged in oil. Perhaps if you got a schematic of a lower unit and looked at it, it might help. You know what, never mind, just continue in your lack of understanding. It just not that important.

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