Lower unit failures

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  • Lower unit failures

    What's are the common causes of lower unit failures outside of water intrusion? Like engines being hung to lower, operator abuse, ect.

  • #2
    Improper filling, load, wrong lubricant, bad seal.
    Engine Sales and Service
    Ph +1 954.463.1515
    Fx +1
    954.463.4904
    Toll Free: 800.622.6747

    oparker@parkeryacht.com
    www.parkeryacht.com

    Member of the MSHS Group

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    • #3
      Barking motors in rough water...

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      • #4
        A bad propeller (say out of balance) is not doing the lower unit any favors either.

        I suspect that a motor that is mounted really really high, to the point where some propeller blades may be piercing the surface of the water, would be harder on a lower unit than if the lower unit was further down in the water.

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        • #5
          Hitting things underwater, either after a storm, or because the owner was too cheap to drop $300 on a basic garmin that will tell/show you things like “submerged piles”.

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          • #6
            Improper cable adjustment.
            Shifting too slowly.
            Barefoot Boats
            contact@barefoot-boats.com
            (386)256-6977

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            • #7
              High rpm shifting from one gear to another. Most common to us is seal failure, which leads to the gear lube getting dumped out unknowingly to the owner. Another common thing is hitting stuff. Either on or off the trailer.
              Andrew Munao Jr
              Yamaha Sales/Tech Support, SIM Yamaha
              888-231-2392 | andyjr@shipyardisland.com | simyamaha.com

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              • #8
                I lost my lower st 185 hours I would like to not repeat that. I'm not sure if it was operator error or just a factory defect. I have had many boats all singles and all alpha ones and never lost a lower unit. There was proper amount of oil no water intrusion and I never hit anything.anything's

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                • #9
                  Originally posted by Adam9066 View Post
                  I lost my lower st 185 hours I would like to not repeat that. I'm not sure if it was operator error or just a factory defect. I have had many boats all singles and all alpha ones and never lost a lower unit. There was proper amount of oil no water intrusion and I never hit anything.anything's
                  When you say that, any indication why?
                  Burnt oil? Water in oil? Chips on skeg, prop?
                  Engine Sales and Service
                  Ph +1 954.463.1515
                  Fx +1
                  954.463.4904
                  Toll Free: 800.622.6747

                  oparker@parkeryacht.com
                  www.parkeryacht.com

                  Member of the MSHS Group

                  Comment


                  • #10
                    Originally posted by Parker Yacht View Post

                    When you say that, any indication why?
                    Burnt oil? Water in oil? Chips on skeg, prop?
                    No but oil, no water intrusion, oil was changed at 75 hours. No damage skag or prop. They said when drained it there was a good amount of shavings. It sounded like I broke a damn rod in the block the noise was awful.

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                    • #11
                      Stb or port?
                      Any chatter on the WWW of ETEC L/U issue's?
                      Sometimes Doo Doo happens, unfortunately, it appears to have happened on your application more often then not.
                      Engine Sales and Service
                      Ph +1 954.463.1515
                      Fx +1
                      954.463.4904
                      Toll Free: 800.622.6747

                      oparker@parkeryacht.com
                      www.parkeryacht.com

                      Member of the MSHS Group

                      Comment


                      • #12
                        There has been a few I have seen post with low hour failures. it was the starboard motor .

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                        • #13
                          Mine went bad because the idle speed was too high by 100rpm or so. It was like that for years, and I really didn't know it was a problem. Eventually things wore out and got really load shifting in and out of gear.

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