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Slipping out of gear

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  • Slipping out of gear

    I have a 1969 starcraft with 120hp mercruiser I/O. While I was running up the lake the boat felt like it would come out of gear, and would rev up without going anywhere. I could go slow up the lake at about 2000-2500rpm with no problem. After fishing and running on and off slow all day, the boat operated just fine on the way back to the ramp. Any tips on what this may be?


  • #2
    Re: Slipping out of gear

    At first thought I would say a prop spinning on the hub, but the fact that later in the day it performed normaly leaves that in question. Did you physicly feel it come out of gear? I would think that at higher rpm if your drive came out of gear there would be a very noticable "clunk". If that's the case a simple cable adjustment could correct it.
    Hope for the best, but plan for the worst. It can only get better from there.

    In the world of boating water needs to know it's place.

    Comment



    • #3
      Re: Slipping out of gear

      I do not hear any clunk when this happens. When it does I will be cruising and just hear the boat start to spin, and see the rpm jump up. I can physically feel the boat slow down, and then sometimes you can feel it engage and the boat will take off again. It is strange that it stops after the day out and runs great on the way back. This is my first boat and I don't know much about them, so any help would be appreciated. Thanks.

      Comment



      • #4
        Re: Slipping out of gear

        sounds like a slipping hub

        try a new prop, good idea to have a spare
        Sometimes when people try to save a penny, they end up spending a dollar

        It is best to fully understand how to properly operate, inspect, troubleshoot and repair your equipment

        Comment



        • #5
          Re: Slipping out of gear

          No clunk, happens intermittently, above certain RPM: I suspect prop cavitation, especially if you have a solid prop hub. Try a different prop.
          Terry
          87, 4WINNS H 190
          470/Alpha I

          Comment



          • #6
            Re: Slipping out of gear

            My thought also, cavitation.

            When it happens and the boat slows, let it drop off plane, then increase throttle. Does it continue to slip, or does it bite until you're fully planed, and then slip again?

            Does turning left or right make the slipping worse?

            Is your cavitation plate of the outdrive lined up with the bottom of the boat?

            Comment



            • #7
              Re: Slipping out of gear

              lower you trim a little
              When will people learn that impellers require regular
              replacement and are not drive it till it pukes items?

              1984 Regal Medallion 195
              3.8 V-6 with the dreaded
              OMC Stringer Drive.
              2003 Avalanche w/Hypertech

              If it ain't fixable - don't break it!

              Comment



              • #8
                Re: Slipping out of gear

                I agree. Could very well be cavitation.
                Hope for the best, but plan for the worst. It can only get better from there.

                In the world of boating water needs to know it's place.

                Comment



                • #9
                  Re: Slipping out of gear

                  I am having the same problem on a 2003 5HP Mercury 2-Stroke.
                  I know its a small motor which should make pin pointing the problem easier however I'm still struggling. It doesn't seem at all that its slipping in the water. It definitely seems to be slipping somewhere internally. Usually when there is a good deal of torque on the prop or at high rpms it will slip and if I back of the throttle I can feel it kick back into gear. So if at full throttle with the prop engaged i do 15 it drops to 2 or 3 when it slips. I thought i may have been hitting bottom so i checked the depth and it was wayyyyy to deep. I tried spinning the prop with the motor off but in gear and it turns the motor. What baffles me is the fact that whatever this part is that is slipping hasn't blown apart yet. And that it goes back to normal when i back off.

                  This is a link to a better copy of the gear housing components
                  http://www.**********/parts/search/Me...nts/parts.html

                  Comment



                  • #10
                    Re: Slipping out of gear

                    Just had this same problem yesterday 9/25. 115 HP Evinrude, 250HRs, Started to get-on plane, when half way out-of-the whole, the gear slipped and engine RPM excellerated very high, but no torque on the prop. Runs and spins prop at low RPM and hobbled back to the dock. Any troubleshooting ideas to check this problem out?

                    Comment



                    • #11
                      Re: Slipping out of gear

                      Originally posted by Reel Easy View Post
                      Just had this same problem yesterday 9/25. 115 HP Evinrude, 250HRs, Started to get-on plane, when half way out-of-the whole, the gear slipped and engine RPM excellerated very high, but no torque on the prop. Runs and spins prop at low RPM and hobbled back to the dock. Any troubleshooting ideas to check this problem out?
                      yeah, start a new thread in the outboard forum
                      Sometimes when people try to save a penny, they end up spending a dollar

                      It is best to fully understand how to properly operate, inspect, troubleshoot and repair your equipment

                      Comment

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