Engine Hatch Reinforcements/Repair Ideas

Discussion in 'Classic Sea Rays' started by Dave4562, Feb 6, 2020.

  1. Dave4562

    Dave4562 Member

    Nov 10, 2019
    86 390 express cruiser
    454 Crusaders
    I have a 390 Express and the engine hatch covers feel like they give a little when you walk on them. no cracks and they look ok but you can feel it when you walk on them.
    I was thinking to reinforce the underside somehow and thought it must be a common problem.
  2. BillK2632

    BillK2632 Well-Known Member GOLD Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    Sounds like there could be some rot in the coring.
  3. duckhead69

    duckhead69 Member

    Jun 11, 2010
    michigan lake Erie
    2006 Nova
    1989 215 sundowner
    1986 300 weekender lowrance HD-5
    350 chevy inboards velvet drives
    Yes I would agree only way glass gets soft is when core is rotten. SO you can have the bad wood cut out then lay new fiberglass and blend to original surface. But for a quick fix put some 3/4 marine or regular plywood on the bottom side with kittyhair or duraglass then fiberglass over the top. Or look in junk yard for better ones
    Good luck Marty
  4. Golfman25

    Golfman25 Well-Known Member

    Sep 12, 2009
    Yeah. Sounds like rotted core. But, if a hatch cover should be relatively easy to fix. Remove the cover, flip it over. Drill some exploratory holes to confirm it's the core. Then remove the fiberglass, clean out the core and replace.
  5. Sublimetime

    Sublimetime Active Member

    Oct 22, 2007
    clifton nj
    420 da
    Because of the way the hatches are made /and opened on that particular boat , you have to lift one side -then slide the hatch on the divider aluminum strip and then remove the hatch. The sliding action causes the hatch to get a cut in it on the shoebox type lid/edge.

    Pay close attention to this area as the deeper that slit gets the easier it is for the hatch to flex, ESPECIALLY since there is no coring for the 3" border around the edges of those hatches.
  6. Dave4562

    Dave4562 Member

    Nov 10, 2019
    86 390 express cruiser
    454 Crusaders
    Thanks for the info. I looked and it seemed pretty thin to me so wasn't sure if there is a core. I thought it might just be age and thin material but I know it needs something.

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