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Water leak in Bildge

I have a litre an hour water leak .Hours have been spent trying to find it ..It doesnt appear to  be on the engine anywhere .hoses clamps drains all dry..AND  it only leaks when the boat is moving .......We have had the engine in drive and used mirrors ect. to no avail .We even tied paper towel under the engine and rear area .........dry.............The water is cold and clear .....Would a shift bellows do this ????.. Any help would appreciated , before i lay in the engine compartment while the boat is moving at a good speed ..Tell me it cant be the seal on the transom yoke  ,????? please

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    rinker312rinker312 Member Posts: 255 ✭✭

    Daze. What boat we dealing with here? What drive?  Have you checked all thru hull fittings?  Does your boat have fresh water system?  If so have you checked all fresh water fittings etc...  Certainly could be shift bellows but you would think that it would leak all the time then unless it is a very fine cut and only let's water in when you turn the wheel or something. That may be something to try. Start engine and while in neutral turn the wheel back and forth to see if that triggers the leak. Something else to try might be to get some paper towels near the bottom of the transom area to see if they get wet at least that will narrow down the search a little. Not sure what you mean by seal on transom yoke. You mean the gimbal ring seal?  If so you should be able to see this by laying on top of the engine and look where the steering arm goes through the transom. Shove some paper towels in there and see if there is moisture in there.  That was my problem a couple years ago. 

    Let us know on the above and we will go from there. Good luck. 

    2004 Rinker 312, 5.0 Merc's, Bravo III, Lake Wheeler, AL

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    frenchshipfrenchship Member Posts: 1,079 ✭✭✭

    Welcome,

    Daze. What boat we dealing with here? What drive? 

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    MarkBMarkB Member Posts: 3,969 ✭✭✭✭✭

    do you have a raw water pump? My friends fitting was loose and it leaked while underway only because it had a special pick up to get water while on motion. 

    Boat Name: King Kong

    "Boat + Water = Fun"

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    mvnmvn Member, Moderator Posts: 744 mod

    Check the speedo pitot tube behind the engine on the transom shield.   The plastic fitting breaks easily allowing water into the bilge only when underway. 

    Mark

    Good,  fast,  cheap.... pick two. 
    2019 MTX20 Extreme

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    Lifes GoodLifes Good Member Posts: 465 ✭✭✭

    Only water during running not sitting. Hummmm...

    Bellows really only leak when sitting.  On plane the are out of the water.

    Engines dry but water in bilge....

    So my logic takes me to a forward compartment as the boat planes water moves south....

    Check freshwater system for leaks.

    Check shower sump for leaks.  Like a lose top.

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    kneedeepkneedeep Member Posts: 103 ✭✭✭

    There was a recent thread about bravo 3 steering pins leaking.  I have water in my bilge & suspect this is the cause.  I'm bringing my boat to a merc dealer for winter storage & will find out for sure.  If your leak is through the steering pin, you will be able to see it.  The other thread has pictures posted that will show you where to look.  

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    kneedeepkneedeep Member Posts: 103 ✭✭✭

    I'm not sure if running or not running matters for the steering pin leak??

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    dazeoff03dazeoff03 Member Posts: 3

    thanx..........still working on the problem .......could it be in the exhaust somewhere at the rear area ...?
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    rmrstlmormrstlmo Member Posts: 225 ✭✭✭

    I just found out one of my bravo III's is leaking where the steering arm goes through the transom.  It only leaks when the boat is sitting.  Good luck.

    Ray

    2006 390

    Previous 2000 340

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    pepmysterpepmyster Member Posts: 308 ✭✭✭

    Looks like that is also going on in mine.........

    All I've wanted was to just have fun.

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    rinker312rinker312 Member Posts: 255 ✭✭

    Highly recommend the JR marine fix to you guys. I'm on my second year with it and no problems or water at all. 

    2004 Rinker 312, 5.0 Merc's, Bravo III, Lake Wheeler, AL

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    gearshiftgearshift Member Posts: 13 ✭✭

    Yes, I agree with the above. The Stainless steel steering pin from JR Marine is not only superior to the Mercruiser pin, it is much less expensive. They even have a 30 minute video on how to perform the job. (if that's your problem)

    I installed a mercruiser pin 10 years ago in my 1992 Rinker 260. It lasted 10 years, but started leaking again. I went with the JR Marine to save some money and put in a quality pin.

     

    www.jrmarine.com

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    TikiHut2TikiHut2 Member Posts: 1,431 ✭✭✭✭✭
    The bushing gets tired and starts to wallow, causing the leak. Not a fun job.
    2004 FV270, 300hp 5.7 350mag MPI Merc 305hrs, 2:20 Bravo3 OD w.22p props, 12v Lenco tabs, Kohler 5kw genset, A/C, etc.etc...
    Regular weekender, Trailer stored indoors, M/V TikiHut, Sarasota, Fl
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    PartsManPartsMan Member Posts: 246 ✭✭✭
    The mercruiser steering pin rusts and corrodes ruining the seal. The stainless steel pin from JR Maine will not rust.
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    rinker312rinker312 Member Posts: 255 ✭✭
    If I recall, there are two bushings that the pin slides into a small one at the top and a bigger one in the middle.  Both being a major PIA to remove, I think I ended up having to drill one out. Then there is a seal that kind of sits somewhat flush with the exterior of the transom assembly where the pin goes in.  I was very surprised what a small flimsy seal this is.  Since this is a major component of keeping your boat afloat, I would have expected something a little beefier.  the nice part is, that after the JR marine kit is installed, if you ever have to replace that seal again, it should be pretty easy to do.  I have a parts list that I ordered for doing this job.  If anyone is interested I can see if I can post it somehow.  Let me know. 

    2004 Rinker 312, 5.0 Merc's, Bravo III, Lake Wheeler, AL

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    frenchshipfrenchship Member Posts: 1,079 ✭✭✭
    Rinker 312.
    Can you pls send me the list as I am going to order two. Only one is leaking so far but might as well do both of them.
    thanks.
    Paul
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    rinker312rinker312 Member Posts: 255 ✭✭
    Here are my notes, now you may not need all the parts on this list, as I did some other stuff, but this will put you in the ball park.  Hope it helps

    2004 Rinker 312, 5.0 Merc's, Bravo III, Lake Wheeler, AL

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    frenchshipfrenchship Member Posts: 1,079 ✭✭✭
    Thanks for the Infos 
    Paul 
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    rinker312rinker312 Member Posts: 255 ✭✭
    I did the work myself and yes I watched the video.  It was a little scary drilling little tiny holes in the transom and then cutting them out, but it all turned out well.  I didn't need any of the special tools that JR marine said you would need, I was able to get in with regular wrenches.  If you have any questions on the process I will be happy to help. 

    2004 Rinker 312, 5.0 Merc's, Bravo III, Lake Wheeler, AL

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    rinker312rinker312 Member Posts: 255 ✭✭
    Well, the marina should do what ever you tell them to do, but if they don't want to do it, I would find someone else who will.  First off it will be cheaper, second, If you pull the engines and do it the old way, you are just setting yourself up to have to do it all again in a few years.  If you do the JR marine fix, next time you have the problem, it is really a pretty easy fix.  I used what I always have for seating a seal, the proper size socket that is the same diameter as the seal.  I have a metric impact set and I believe one of those sockets worked just right. 

    2004 Rinker 312, 5.0 Merc's, Bravo III, Lake Wheeler, AL

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    rmrstlmormrstlmo Member Posts: 225 ✭✭✭
    My marina guy told me last week that the JR Marine kit was the way to go.  He has done them both ways (JR Marine and Merc kit).  He said removing the engines was the last resort.  He'll be doing mine in the next week or two.

    Ray

    2006 390

    Previous 2000 340

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    Black_DiamondBlack_Diamond Member Posts: 5,439 ✭✭✭✭✭
    RY: you can pull that B2 pretty easy with a friend, you might need a 3rd friend to help install, mainly to get the splines to line up.  A piece of wood on a floor jack with someone(s) to hold it while you get in position works too.  Do it with the prop off to save the weight and other issues.

    Past owner of a 2003 342FV
    PC BYC, Holland, MI
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    rinker312rinker312 Member Posts: 255 ✭✭
    Agree with diamond. I've often done my bravo iiis with a jack on my own. But one friend makes a huge difference.   

    2004 Rinker 312, 5.0 Merc's, Bravo III, Lake Wheeler, AL

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    Dream_InnDream_Inn Member, Moderator Posts: 7,594 mod
    RY, I'll send my son down to you! :smiley: I know of two boats in my marina that had this done just this year, pulling the motors. (actually one is a member on here - Eagle's Nest)

    Dream 'Inn III -- 2008 400 Express

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