prop steer?
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prop steer?

  1. #1
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    Default prop steer?

    when i accelerate, be it quickly or gradual, when im getting up to speed the boat pulls (for the life of me i can remeber what side) to one side, and when im slowing down, it pulls to the opposite side. im running a volvo 290 out drive, everything seems tight as far as the steering, not much play at all in the out drive. boat is set up for power steering, but is not plumbed for it currently. im not sure where else to look.

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    Hi Jeff,, my volvo outdrive (250) does the exact same thing while accelerating. When I take off hard WOT the boat pulls way hard to the left and I have to continuoulsy "counter steer" until I slow down and ultimatley stop..

    Haven't noticed a dramatic pull opposite when I let off though,, the boat seems to continue in a straight line with no opposite steering needed.

    I'd be interested to see what others say too.
    1982 Eliminator 21' Sport
    Chevy 350
    Volvo Penta 250 Outdrive.

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    Do you have power steering? Any play in your our drive side to side?

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    Mine will pull hard to the left and I have to counter steer about a full rotation to the right and then its fine, but when i slow down I have to do the opposite.

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    No power steering in mine at all. A full rotation of the steering wheel to correct? Whoa mine isn't that bad, I would say maybe a 1/4 turn at most otherwise it would jut pull left. While under power it feels like a really bad aligned car keeping it going straight.
    1982 Eliminator 21' Sport
    Chevy 350
    Volvo Penta 250 Outdrive.

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    You guys may want to check your torque tab on the bottom of the cavitation plate on your outdrive.

    If it is adjusted too much, it will give the symptoms you describe. The prop wash will torque it to one side, but when you let off, the torque swings the other way. It is VERY sensitive to adjustment, and sometimes moves on its own. I've even had one snap off.

    Make sure it is dead straight, and give it a try. If you have to move it, mark the tab and cav plate with a pen, and only move it in 1/8" increments. Once you get it as close to neutral as you can, lock washer and Locktite the allen bolt.

    My old Volvo varied the torque-steer depending on the type of prop and/or trim levels. The torque tab helped neutralize it a little, but only power steering eventually eliminated it.
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    sooo......lets say hypothetically, this guy i knew forgot to install that torque tab you mentioned. could that cause the pulling issues ? on a side note, do they make torque tab sacrificial anodes ?

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    Quote Originally Posted by jeffz0rz View Post
    sooo......lets say hypothetically, this guy i knew forgot to install that torque tab you mentioned. could that cause the pulling issues ? on a side note, do they make torque tab sacrificial anodes ?
    Tell that guy you know that he's a loser for leaving it off! lol...

    Yes, without the torque tab, cable steering gets very funky. Not sure about the anodes? I just remember it being a hunk of aluminum with a stainless allen bolt.
    "Warming the globe...16 cylinders at a time."

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    haa,, Ok,, so I will be the first to admit the loser status... What is the torque tab? I don't remember seeing any aluminum on the bottom or side of the drive since I got the boat last year. should it be under the water line?
    1982 Eliminator 21' Sport
    Chevy 350
    Volvo Penta 250 Outdrive.

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    It's a small fin that is right above the prop and right below the cavitation plate. Should be a hole smack dab in the middle where the tab bolts up.

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    Quote Originally Posted by jeffz0rz View Post
    It's a small fin that is right above the prop and right below the cavitation plate. Should be a hole smack dab in the middle where the tab bolts up.

    I'll take a look and a picture when I get home, but the only thing I remember seeing right above the prop on my drive was the small fin thing that the exhaust comes through. Might be a totally different setup than what you have though.
    1982 Eliminator 21' Sport
    Chevy 350
    Volvo Penta 250 Outdrive.

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    Quote Originally Posted by jeffz0rz View Post
    It's a small fin that is right above the prop and right below the cavitation plate. Should be a hole smack dab in the middle where the tab bolts up.
    This is what it looked like on my old drive:



    I've seen older drives with a different kind, but basically, they all work the same. The prop wash over the fin holds the drive straighter when the prop is trying to torque it over.
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    "Warming the globe...16 cylinders at a time."

    Quote Originally Posted by Rexone View Post
    Perhaps I'm gay...

  15. #13
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    Thanks for the pic, that helps alot.. I think that is a newer or at least a different model drive than I have. If I remember correctly from the diagrams that I have seen, the exhaust goes through the cav plate on that one correct? The little fin above the prop is the torque tab being mentioned..

    Mine looks about the same only the cav plate is one solid piece, and the tab above the prop is where the exhaust would come through...

    Talk about restricting a SBC exhaust.. I have the through transom tubes already and just waiting for the elbows to come in and some time to mount them.. if nothing else it will look cool, be a lot louder, and HOPEFULLY see some performance increase.
    1982 Eliminator 21' Sport
    Chevy 350
    Volvo Penta 250 Outdrive.

  16. #14
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    What picth prop were you running?

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