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Leak around the transom

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  • Leak around the transom

    I have a leak coming in around the bottom of the transom it just trickles in. I replaced the drive bellow last year and the shift cable looked good. I may have not got the drive bellow sealed correctly, but if it was the drive bellow wouldnt it leak in around the drive shaft? It comes in at the bottom of the transom plate. Any suggestions?

  • #2
    Re: Leak around the transom

    Is this a Mercruiser? The bad news? Chances are good your transom is rotten and leaking.

    Could also be the lower bolts - which are an aluminum alloy - are corroded out and leaking. But if they are, then your transom itself is probably shot too.

    It could also be the exhaust pipe - where it connects with the transom plate.... but either way, the engine has to come out to fix.

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    • #3
      Re: Leak around the transom

      Thats what happened to my baylinner. When I pulled her apart rotten at the lower section. I hape its you exhaust gasket or a lose bolt.

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      • #4
        Re: Leak around the transom

        Ayuh,... 9 times outa 10, it's a Rotten transom....

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        • #5
          Re: Leak around the transom

          thanks for the info

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          • #6
            Re: Leak around the transom

            Yes it is a mercruiser, is there anyway to tell if the transom is rotten or if the exhaust pipe is bad with out taking the motor out? I just dont want to put alot of money in it but if its something some what easy to fix I would do it.

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            • #7
              Re: Leak around the transom

              Take a mirror and poke it around by the suspect area where it's leaking and see if you can find it,,, while the boat is in the water. If a mirror is too hard to see that far down, try poking a digital camera down there and snap a bunch of pics.

              As for the leak, I don't think you have an easy fix there... bellows, transom seal/rotted transom, exhaust seal. None of these are easy fixes. About the only "easy fix" would be if the tilt-trim hose manifold is leaking, but that would be on the bottom of my list of suspect areas.
              2001 Crestliner SuperHawk 1800, Mercruiser 140HP
              2007 Tracker 1436 jon boat, 7.5HP Force

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              • #8
                Re: Leak around the transom

                I put mine nose up and filled the bilge with water. Did not come even close to the drive shaft. It leaked on the outside at lower transom. Took it apart and it was rotten.

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                • #9
                  Re: Leak around the transom

                  It very well could be the transom because this fall when i noticed it leaking it was trickling in between the inner plate and the transom. I figured if it was the drive bellow leaking then it would come in around the drive shaft. Just the joys of owning a boat...lol

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                  • #10
                    Re: Leak around the transom

                    I had a very small trickle leak that I was barely able to see....it leaked from the very bottom of the transom plate.......YET, it is simply the Upper Swivel Shaft seal that's leaking, as it's wet in the area where the steering lever goes through the transom....the water just happens to run down (I don't know exactly how), and appears to leak from transom plate.

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                    • #11
                      Re: Leak around the transom

                      I have a 1990 17' sunbird and i had the same probem when i bought the boat. I took to several shops and they said the transom was great. Thank god. I went ahead and opted to seal around the drive with a sealer called Thermo Plastic by a company called Nuflex instead of pulling the motor and drive. Has worked excellent for over a year.

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                      • #12
                        Re: Leak around the transom

                        I went ahead and opted to seal around the drive with a sealer called Thermo Plastic by a company called Nuflex instead of pulling the motor and drive.
                        That is a bandaid stuck on a bullet wound. Fixes nothing, but may of stopped the bleeding for a short time.
                        The only way to fix the problem is to pull the transom shield and put in a new seal.
                        It's also very possible the exhaust Y has corroded through where the seal ring goes, or a tab has corroded and broken off. Either way the engine has to come out to actually locate the problem.
                        I have pulled many engines, put the drive back on. Plugged the exhaust Y, strapped the boat to the trailer and backed them down in the water and crawled into the engine compartment where the engine was and actually looked for and found the leaks.
                        Don S.


                        Please, no PM's (Private Messages) regarding boat/engine problems.
                        That is what the forums are for.
                        Only forum/moderator issues will be answered in PM's.

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                        • #13
                          Re: Leak around the transom

                          Ok I have got some good things to look at as soon as the weather gets a little better. More than likely I can rule out the drive boot and the shift cable boot leaking right?

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                          • #14
                            Re: Leak around the transom

                            Raise front of boat. Water the bilge, and look in the back. Dont go over the lower access of the drive shaft. I have found several leaks this way. and I dont have to haul to lake.

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                            • #15
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                              Re: Leak around the transom

                              Originally posted by Brentathon View Post
                              I had a very small trickle leak that I was barely able to see....it leaked from the very bottom of the transom plate.......YET, it is simply the Upper Swivel Shaft seal that's leaking, as it's wet in the area where the steering lever goes through the transom....the water just happens to run down (I don't know exactly how), and appears to leak from transom plate.
                              +1. This was my leak. Well, one of my leaks.
                              If it ain't broke, it will be after I do this...

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