[Pics] Ultra 21' takes on water only when moving - I'm stumped!
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Ultra 21' takes on water only when moving - I'm stumped!

  1. #1
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    Default Ultra 21' takes on water only when moving - I'm stumped!

    Hey all. I have a 2002 Ultra 21' with a 496 Mag and Bravo One. I've been banging my head trying to figure out why it takes on water. At first I thought the rear vents were taking on water via the wake when I come off plane but I confirmed that is not the case today by temporarily blocking them off.

    I spent a lot of time idling/floating today while I looked around the engine compartment and I could not find the leak. Water level in bilge while floating seems to stay the same. It appears to only take on water when moving. Of course I was by myself today so I unfortunately wasnt able to have someone drive for me while I looked for the source. The best I could do was to abruptly close throttle and run back to see if water came pouring in from the rub rail seam, or a thru hull bolt, or something like that but nothing obvious. Leads me to believe the source is down below more. Its not a small amount of water either. It can definitely take on a good amount in a short ride.

    Bellows look OK to me. Clamped securely and no visible cracks. Not sure if this matters but the exhaust bellow is the type that clamps only on the transom end while the other end just slips over the drive when trimmed down. My exhaust is thru-hull anyway. Hull and transom are very clean with no damage or cracks either. I followed all the hoses that contain water and everything is secured and in good shape. When I got home today, I ran it on the garden hose and revved it up while in neutral to see if maybe the leak showed up at higher RPM but still no sign of it. Im so lost!

    I already removed the rear seat. Guess my next step is to remove the hatch and take it for another spin with a driver so I can spend my time in the back looking for the leak. You guys have any other possible ideas or recommendations for me?

    I took a bunch of random photos just in case it helps. Thanks!
    Last edited by mattyd272; 04-22-2019 at 04:11 PM.

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  3. #2
    rollin on the river DAVEO's Avatar
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    I would check the speed o line from the drive. There should be a connection somewhere on the inner transom bracket. Or your transom bolts make sure they are tight. If itís only when moving I would have to say the speedometer tube came disconnected.
    Alcohol free since 8/8/1993
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    Thanks for the reply. I thought about that too but I followed the speedometer tube all the way from the outdrive pick up and thru the transom. Looks secure on both ends. I’ve got help on Monday so I’m going to take it out on the water and let my help drive while I look for the source out back. Wish me luck! I’ll update Monday.

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  6. #4
    rollin on the river DAVEO's Avatar
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    Quote Originally Posted by mattyd272 View Post
    Thanks for the reply. I thought about that too but I followed the speedometer tube all the way from the outdrive pick up and thru the transom. Looks secure on both ends. Iíve got help on Monday so Iím going to take it out on the water and let my help drive while I look for the source out back. Wish me luck! Iíll update Monday.

    Awesome! Hope you find it.
    Alcohol free since 8/8/1993
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    Found it! There are two water drain actuators on this engine in order to winterize. They way they operate is you pump air into the actuator and the pressure opens the springs to allow water to drain out. When the spring ages and gets weak, the pressure of the water passing thru the system when running the engine on the lake causes the spring to open and spray water into the bilge. Solution is to replace the actuator for $250 or remove it and essentially bypass it.

  8. #6
    deckboat owner rschap1's Avatar
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    Default Congrats

    Good job with the detective work

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