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Thread: Seacock prob

  1. #1
    Join Date
    Feb 2010
    Posts
    1,423

    Default Seacock prob

    Toilet outlet through hull seacock only turns half the distance I remember it doing last year. In closed position I cannot pump out. In apparently partially open I can for number ones, and I'm too scared to risk it with 2s. Any clues as to what might be going on without diving or lifting the boat.

  2. #2
    Join Date
    Sep 2006
    Location
    Oslo, Norway
    Posts
    1,361

    Default Re: Seacock prob

    Quote Originally Posted by PabloPicasso View Post
    Toilet outlet through hull seacock only turns half the distance I remember it doing last year. In closed position I cannot pump out. In apparently partially open I can for number ones, and I'm too scared to risk it with 2s. Any clues as to what might be going on without diving or lifting the boat.
    What type of seacock? Half is what, how many degrees?
    you could take the hose off to check

  3. #3
    Join Date
    Jan 2008
    Posts
    225

    Default Re: Seacock prob

    Gate valve or ball valve?

    Google those terms for pictures of both.

  4. #4
    Join Date
    Jun 2005
    Location
    Solent, UK
    Posts
    4,095

    Default Re: Seacock prob

    It depends on the design of seacock. My Blakes Seacocks are reliable but I did have a wee problem the year I fitted the handle 180 degrees out. Could yours be 90 degrees off perhaps? If this were the case, you'd not be able to open it at all, however far you turned it.

    If you have a Ball cock, it's possible you have an obstruction.

    Either way, to solve the problem you need to haul out, even if its only for a tide, so you can examine it and solve the problem for good and all.
    Grow old disgracefully, it's more fun

  5. #5
    Join Date
    Feb 2010
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    1,423

    Default Re: Seacock prob

    It's a ball valve, not blakes type.

    I could understand an obstruction stopping it closing, but not stopping it open?
    Last edited by PabloPicasso; 17-05-18 at 20:14.

  6. #6
    Join Date
    Jan 2008
    Posts
    225

    Default Re: Seacock prob

    Quote Originally Posted by Topcat47 View Post
    Either way, to solve the problem you need to haul out, even if its only for a tide, so you can examine it and solve the problem for good and all.
    Or get/make something like this...

    http://www.seabung.com/

    Cheaper than a lift out, or make your own.

  7. #7
    Join Date
    Sep 2006
    Location
    Oslo, Norway
    Posts
    1,361

    Default Re: Seacock prob

    Quote Originally Posted by PabloPicasso View Post
    It's a ball valve, not blakes type.

    I could understand an obstruction stopping it closing, but not stopping it open?
    how many degrees can you move the handle?

  8. #8
    Join Date
    Apr 2009
    Posts
    4,775

    Default Re: Seacock prob

    Quote Originally Posted by PabloPicasso View Post
    It's a ball valve, not blakes type.

    I could understand an obstruction stopping it closing, but not stopping it open?
    It should turn 90 degrees. Quite probably it is calcium build up that is restricting it turning. Of course the risk with brute force is that the skin fitting is partly de-zinc'd and can't take it.

    I replaced one a couple of years ago yet with a bit of brute force after replacement I got it working ok. Turned out to be bronze too, so would've lasted a while longer if I hadn't replaced it. I took the handle off and used an adjustable spanner to turn it.

  9. #9
    Join Date
    Feb 2010
    Posts
    1,423

    Default Re: Seacock prob

    Quote Originally Posted by lpdsn View Post
    It should turn 90 degrees. Quite probably it is calcium build up that is restricting it turning. Of course the risk with brute force is that the skin fitting is partly de-zinc'd and can't take it.

    I replaced one a couple of years ago yet with a bit of brute force after replacement I got it working ok. Turned out to be bronze too, so would've lasted a while longer if I hadn't replaced it. I took the handle off and used an adjustable spanner to turn it.

    Yes, it should turn 90 degrees but is likely only making 45. I took off the handle and tried a spanner. But it turns and stops at. definite point. I was reluctant to use force as the boat is afloat, and did not want to risk breaking any part.

  10. #10
    Join Date
    Apr 2009
    Posts
    4,775

    Default Re: Seacock prob

    Quote Originally Posted by PabloPicasso View Post
    I was reluctant to use force as the boat is afloat, and did not want to risk breaking any part.
    I know the feeling.

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