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Outdrive in shallow water

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  • Outdrive in shallow water

    Morning Gang,

    My question is if it's okay to use trailer up instead of trim button when in shallow water? Not like until the prop is out of the water... It just seems like the trim button itself doesn't raise drive significantly enough... I would also be going very slow...
    1999 Alpha 1 gen II drive...

    Thanks in advance!


    Bear
    " Jackson Lee II " 2003 Key West 1720 CC, 2003 Yamaha 115 TRLB

    Lund S-14 Resto http://forums.iboats.com/forum/boat-...1971-lund-14-s


  • #2
    Re: Outdrive in shallow water

    My older Mercruiser the drive had three buttons to control the stern drive. The lower button lowered it, the middle button raised the drive to a position that was the highest recommended - for normal operation (i.e. throttle above idle). To raise the drive above this level both top buttons had to be pushed, raising the drive and prop to the water surface. The marine technican advised be to only operate the drive in this position if the throttle was in IDLE position.

    On occasion I have operated my current VP SX drive in the full-up (trailering) position without any problem. Sure helps getting off sand bars and through shallows (skinny water) near shore. I am sure it places additional stresses on the universal joints, but I have not had any difficulties in 30+ years of boating.

    Just keep off the throttle and you will probably be OK.

    Enjoy the summer
    erie_guy
    Port Clinton, OH

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    • #3
      Re: Outdrive in shallow water

      I would worry mainly about the water pressure. Would help if you have a water pressure gauge. The higher the stern drive is the closer to the surface the prop and the water intake is and more likely you'll get cavatation in the water, thus lowering water pressure.

      Bill

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      • #4
        Re: Outdrive in shallow water

        Mercruiser officially recommends that you avoid running the outdrive (even in neutral) in full trailer position, and suggests that if you need to do it for shallow water, never go above 1200 rpm.


        As long as you dont do it often, it wont accelerate the wear on the joints much beyond normal.

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        • #5
          Re: Outdrive in shallow water

          Thanks gang for all the replies!

          This would just be on occasion very low rpm, in shallow spots... Worried about hitting skeg and prop is all!

          Thanks again for the helpful information!


          Bear
          " Jackson Lee II " 2003 Key West 1720 CC, 2003 Yamaha 115 TRLB

          Lund S-14 Resto http://forums.iboats.com/forum/boat-...1971-lund-14-s

          Comment



          • #6
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            Re: Outdrive in shallow water

            Originally posted by Splat View Post
            I would worry mainly about the water pressure. Would help if you have a water pressure gauge. The higher the stern drive is the closer to the surface the prop and the water intake is and more likely you'll get cavatation in the water, thus lowering water pressure.

            Bill
            at low engine speed/load that wont matter.

            OK at low speed don't exceed idle speed though...

            The U-Joints don't like the high angle

            Every time you double the angle(turning too) on the drive you half the life. Its exponential.
            88 Larson Citation DC 175
            165HP 3.7L I4 (470) alpha 1

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