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    4788 Muffler

    My port muffler is leaking water, suspected crack on the bottom. The stickers that were on both my mufflers have come off over the years. Does anyone have mufflers with the sticker still on them? If so, a picture of that sticker would be super helpful, it's got info such as build number that would make having a replacement built much easier. Sticker should be right on top if it's still there. Thanks for any help or advice!
    James
    2000 4788 | "Freedom"
    Gig Harbor, WA
    11' Novurania w/40hp Yamaha
    Cummins 330's and Westerbeke 8kw
    Hull Extension, Chines and Hardtop

    #2
    I would reccomend removing your muffler and if it is fibreglass, find fibreglass specialist at a local boatyard and have them repair the leak or replace the bottom. If it is made of stainless steel, do the same with a fabrication or welding shop. I believe a quality repair would be as good or better than a new muffler and considerably less costly. If you decide to have it repaired sure to have them leak test it under pressure before returning it to you.
    Stan
    2001 Bayliner 4788
    Underhulls
    Bow & Stern Thrusters
    Hydronic heater
    330 Cummins

    Comment


      #3
      James, is it wet all the time?? How much water?? It actually may not be leaking. I've just had a similar suspicion. Turns out the bilge hose had split just before the thru hull fitting. I was get dribbles when pumping from the manual bilge line and also in a side sea where the fitting was under water, it was coming in from the back wash too. Replacing the bilge hose lines is a real PITA. Try to dry out the wet area with those soaker/chamwah type cloths and see if it actually is the muffler. Worth checking first by wrapping paper towels around the hose lines at the thru hull fittings.

      Have fun. Cheers
      John H
      Brisbane QLD Aust
      "Harbor-nating"

      2000 - 4788/Cummins 370's

      Comment


        #4
        Originally posted by higgins_jr View Post
        James, is it wet all the time?? How much water?? It actually may not be leaking. I've just had a similar suspicion. Turns out the bilge hose had split just before the thru hull fitting. I was get dribbles when pumping from the manual bilge line and also in a side sea where the fitting was under water, it was coming in from the back wash too. Replacing the bilge hose lines is a real PITA. Try to dry out the wet area with those soaker/chamwah type cloths and see if it actually is the muffler. Worth checking first by wrapping paper towels around the hose lines at the thru hull fittings.

        Have fun. Cheers
        I've had a mechanic look at it while under way and he is pretty certain it's the muffler, you can see it bubbling out from under it at higher RPM's. Not a ton of water, but enough that I'd like to get it dealt with so my OCD won't keep driving me nuts!

        Stan, thanks for the advice on the repair vs. replacement. I'm having my mechanic pull the muffler this weekend so I can see what it looks like and will go from there.
        James
        2000 4788 | "Freedom"
        Gig Harbor, WA
        11' Novurania w/40hp Yamaha
        Cummins 330's and Westerbeke 8kw
        Hull Extension, Chines and Hardtop

        Comment


          #5
          Be sure it is not the drain screw that is not leaking, most mufflers have them.
          Sometimes the outlet end for the exhaust hose wears out from the inside.
          Pat says: DO-IT-RIGHT THE FIRST TIME!

          Bayliner 3870 "ALASKA33)
          Twin 350 GM power
          Located in Seward, AK
          Retired marine surveyor

          Comment


            #6
            James, I will try to attach a picture of my starboard muffler from my 2000 4788. In case it doesn't go thru (do to human error) the sticker says: Centek Industries, Inc. Part no. 1600862, Cust. no. 62136

            J Mistress,

            Comment


              #7
              Originally posted by JMistress View Post
              James, I will try to attach a picture of my starboard muffler from my 2000 4788. In case it doesn't go thru (do to human error) the sticker says: Centek Industries, Inc. Part no. 1600862, Cust. no. 62136

              J Mistress,
              This is factastic, thanks!
              James
              2000 4788 | "Freedom"
              Gig Harbor, WA
              11' Novurania w/40hp Yamaha
              Cummins 330's and Westerbeke 8kw
              Hull Extension, Chines and Hardtop

              Comment


                #8
                Boaters discount can help you find replacements. The OEM MFG was Verney vernal lift mufflers. I had similar issue and we pulled them out and re-glassed the bottoms. Had Rick Monroe do it in LaConnor.
                Guntar
                1999 3988
                Cummins 270s

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