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    4788 Bomar portlights

    Does anyone have a confirmed Pompanette model number for the portlights on a 4788? One of them is leaking at the gasket and rather than mess with replacing the gasket and hoping for the best, I'm inclined to just replace the entire assembly. i called Pompanette and gave them the Bayliner part number but they were unable to find it in their database. Another post on BOC indicated that the replacement was a Bomar 2000 series. Defender has a Bomar 2000 that looks a LOT like the existing window.

    http://www.defender.com/product.jsp?...90160&id=85922

    Thanks.
    Evan
    2001 Bayliner 4788 "Fifty / Fifty II"
    League City, TX

    #2
    Don't you just love their "customer service"? Sorry I can't be of any help other than to agree with your pain.

    I hope you avoided the flooding, my youngest sons first job out of grad school was in the Planning Department at League City.
    P/C Pete
    Edmonds Yacht Club (Commodore 1993)
    1988 3818 "GLAUBEN”
    Hino EH700 175 Onan MDKD Genset
    MMSI 367770440

    Comment


      #3
      Evan,
      Did you ever confirm if this was the correct Bomar model number? We determined that the gasket is at least part of the leaking problem and want to replace the gaskets. Hopefully replacing will solve the problem!
      Steve

      also: where did you source the gasket?
      Last edited by Woodsea; 09-10-2018, 11:52 AM. Reason: added gasket question
      2000 4788 w Cummins 370's, underhulls, swim step hull extension
      12' Rendova center console with 40HP Yamaha
      MV Kia Orana
      Currently Enjoying the PNW

      Comment


        #4
        Originally posted by Woodsea View Post
        Evan,
        Did you ever confirm if this was the correct Bomar model number? We determined that the gasket is at least part of the leaking problem and want to replace the gaskets. Hopefully replacing will solve the problem!
        Steve

        also: where did you source the gasket?
        Steve - I was never able to confirm any of the information. I have also not done anything with the gasket yet. It only leaks when we're underway in rough water and taking wave hits on the starboard side which is not very often and can use a bath towel on the shelf to catch any water ingress before it soaks the mattress. I've been waiting for the weather here to cool off before attempting any gasket modifications.

        I think Defender sells Bomar gasket material by the foot.
        Evan
        2001 Bayliner 4788 "Fifty / Fifty II"
        League City, TX

        Comment


          #5
          Originally posted by Woodsea View Post
          Evan,
          We determined that the gasket is at least part of the leaking problem and want to replace the gaskets
          I believe Bayliner used the same type of portlight on the motoryachts. I've just gone through tracing the leak in ours. Found to my surprise that the acrylic lens is attached to the frame with double sided foam tape. Hard to believe, but if you remove the window from the frame, slide a scraper blade in between lens and frame and pry slowly. That's all that holds it. Mine had separated along the bottom part of the lens, and that was one source of water. I'm still getting water in between the outer frame and hull, so I'm now trying to figure out how to remove the entire thing. Hopefully the bolts simply unscrew from the inside. My only concern is that one of the bolts isn't threaded into anything and just pulls out. I'm hoping there isn't a nut on the inside that fell away.
          1988- 3288, 1994- 3288, now Soul Asset: 2001- 3788 w/330s

          Comment


            #6
            Jim,
            We had the same problem and made the same discovery! I believe there is a flaw in how the dogs tighten against the window. They should tighten against the frame however the chisel point of the dog actually tightens against the plexiglass forcing the plexiglass away from the frame. Weird. We solved that by cutting off the very end of the chisel point so the dog presses against the frame and left enough of the smaller chisel point so it still grips the frame. We also removed the crappy tape and rebedded the plexiglass in two beads of 100% marine silicone.

            It’s not leaking thru there any more for us. It’s leaking thru the top between the stationary frame and the gasket. We directed a hose at the frame to determine source. I cannot see anyway to adjust the hinges to increase pressure on the gasket. I’m hoping new gaskets which are not as compressed will solve our issue.
            Last edited by Woodsea; 09-11-2018, 09:53 AM. Reason: Damn spellcheck...changed needed to rebedded
            2000 4788 w Cummins 370's, underhulls, swim step hull extension
            12' Rendova center console with 40HP Yamaha
            MV Kia Orana
            Currently Enjoying the PNW

            Comment


              #7
              Woodsea, hope that works for you. I laid a bead of window putty along the gasket as a quick way to see if it was the gasket. That didn't work so I need to remove the entire assembly. As noted earlier I'm avoiding diving in and removing the machine screws as I'm worried they're threaded into loose nuts. Good fix on the chisel point- I'll do that as well
              1988- 3288, 1994- 3288, now Soul Asset: 2001- 3788 w/330s

              Comment


                #8
                Jim,
                We removed and reinstalled the screws with out any real problems on ours. They seem to be tapped into the exterior frame. I believe the exterior frames are bedded into the hull with some sort of adhesive caulk. The hull and window gets slammed pretty hard when it’s rough seas (3-4’ chop and worse). Possibly the hull flexes on the wave impacts and water penetrates. I don’t know. We used aluminum tape to isolate the frame to hull joint. We have not determined that this joint is or isn't leaking. I reluctant to risk damaging the portlights assembly by trying to remove and rebed. This will be our last resort. We did conclude the plexiglass to inner frame was leaking and the rebedding and chisel point mod fixed that. It looks like the only remaining leak is the gasket to frame seal. I’m hoping new gasket material fixes that! It’s been a bit of a frustrating process for sure. Please post back what you learn! Good luck!
                Steve
                2000 4788 w Cummins 370's, underhulls, swim step hull extension
                12' Rendova center console with 40HP Yamaha
                MV Kia Orana
                Currently Enjoying the PNW

                Comment

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