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1984 C36 Hatch Leaks

Discussion in 'Big Boats' started by jviss, Jul 15, 2017. Add this thread to a FAQ

  1. jviss

    jviss

    Joined Feb 5, 2004
    2,137 posts, 145 likes
    Tartan 3800
    US Westborough Westport, MA
    Greetings,

    We have 3 Bomar hatches overhead - one large on in the center, one smaller one in the head, and a matching small one opposite of it to starboard.

    They leak. The large one seemed to be leaking past the frame, so we removed it and re-bedded it with butyl tape, but it still leaks. It's a mystery to use how the water is getting in.

    Any hints?

    Thanks,

    jv
     


  2. jssailem

    jssailem

    Joined Oct 22, 2014
    3,761 posts, 855 likes
    CAL 35 Cruiser
    US Salem, Moored Port Everett WA
  3. jviss

    jviss

    Joined Feb 5, 2004
    2,137 posts, 145 likes
    Tartan 3800
    US Westborough Westport, MA
    It's a 1984 Catalina 36. Folks who know this hatch and this boat might know the answer. Pics aren't going to help.
     


  4. LeslieTroyer

    LeslieTroyer

    Joined May 20, 2016
    1,013 posts, 213 likes
    Catalina 36 MK1
    US Sammamish, WA Everett, WA
    If you think you sealed the two Bomars well by removing, cleaning and a good application of butyl. Then the water is coming in elsewhere and only exiting into the cabin at the hatches. I would look at the mast collar.

    Les
     


  5. jviss

    jviss

    Joined Feb 5, 2004
    2,137 posts, 145 likes
    Tartan 3800
    US Westborough Westport, MA
    Thanks Les. We only did the main hatch so far. I think I would see the water on the overhead if it was coming from the mast boot. The core was dry when we removed the hatch.
     


  6. LeslieTroyer

    LeslieTroyer

    Joined May 20, 2016
    1,013 posts, 213 likes
    Catalina 36 MK1
    US Sammamish, WA Everett, WA
    I would think a dry core would imply the water is coming in either the top or top gasket. Can you tell where the water is dripping from??

    Les
     


  7. LeslieTroyer

    LeslieTroyer

    Joined May 20, 2016
    1,013 posts, 213 likes
    Catalina 36 MK1
    US Sammamish, WA Everett, WA
    Also water from the mast Collar can run down in the space between liner and deck
     


  8. jviss

    jviss

    Joined Feb 5, 2004
    2,137 posts, 145 likes
    Tartan 3800
    US Westborough Westport, MA
    It really looks like it's dripping from the corner where the hatch frame and deck meet. A bit of a mystery,
     


  9. jviss

    jviss

    Joined Feb 5, 2004
    2,137 posts, 145 likes
    Tartan 3800
    US Westborough Westport, MA
    I must say that I don't understand this comment. By "the liner," do you mean the overhead? That's fiberglass, bonded to the plywood core, as far as I know.
     


  10. LeslieTroyer

    LeslieTroyer

    Joined May 20, 2016
    1,013 posts, 213 likes
    Catalina 36 MK1
    US Sammamish, WA Everett, WA
    It may not be as solid as you would think. Even if there is no water intrusion/rot / delamination.

    Les
     


  11. Guenter Retkowski

    Guenter Retkowski

    Joined Aug 21, 2015
    5 posts, 0 likes
    Catalina 34
    US MI
    Hi there - I have a C34 ( 1986) and had the same problem. Leak in the front corner right of the bowmar hatch frame. Below decks is a teak frame for a bug screen. I took the hatch out, cleaned it and used Dow corning instead of the butyl tape. The stuff is usually used for the fixed portlights, had a cartridge left over from re-doing all fixed port lights a few years back. It's black, so need to tape the deck around the hatch perimeter. Put enough of it with a caulking gun onthe underside of the frame so it squeezes out inside and on the perimeter of the hatch frame. Do not tighten it down right away. Let it cure, 24 h, then tighten it down.
    Worked for me.
    Guenter
     


  12. jviss

    jviss

    Joined Feb 5, 2004
    2,137 posts, 145 likes
    Tartan 3800
    US Westborough Westport, MA
    Thanks, Guenter. Based on how we sealed it with the butyl tape, I can't imagine how water is getting in; but perhaps we'll remove it and re-do it. We have the leak in the same place, and have the same wood-framed bug screen.
     


  13. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    19,564 posts, 394 likes
    Catalina 34
    US Maple Bay, BC, Canada
    jviss, if you are sure of your bedding, then it's not that. I re-bedded my hatch a few years ago and wrote a Mainsheet tech article about it, used butyl tape. Last year I started to get persistent drips from the forward port corner. I thought for sure I'd have to yank it out and start all over again. Being the sailor I am, I put a pot on the cabin sole to catch the drips until "I could get to it!" :) Once I did, I inspected the leak more carefully. I determined that it appeared that the leak was coming NOT from the frame, but from the glazing to the frame. A friend of mine in Chicago with a C34 took his off and had the glazing redone by an auto parts store. Instead of that I waited for a sunny day and applied Captain Tolley's Creeping Crack Cure around the leaking area.

    Problem solved.

    Good luck. Mine is a 1986 Bomar hatch, too.
     


  14. jssailem

    jssailem

    Joined Oct 22, 2014
    3,761 posts, 855 likes
    CAL 35 Cruiser
    US Salem, Moored Port Everett WA
    I know about Stu's pots on the floor... He calls them his "Water torture" tools.
     


  15. LeslieTroyer

    LeslieTroyer

    Joined May 20, 2016
    1,013 posts, 213 likes
    Catalina 36 MK1
    US Sammamish, WA Everett, WA
    and here I thought they were to piss into --
     


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