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Buzzing noise on 1986 3270 Motor Yacht-gctid820918

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    Buzzing noise on 1986 3270 Motor Yacht-gctid820918

    Looking for help in identifying a part. (See attachment)

    Buzzing noise starts about 20 minutes after starting the engines. We've traced the noise back to the starboard engine. The noise appears to be coming from the fly bridge.

    All gauges are normal. The part says 4099. The wires attached are purple and green. Any ideas what this could be?


    Attached files


    #2
    That, my friend, is an alarm buzzer. They are pretty generic so, depending on where and how you buy accessory parts, you might replace both on the flying bridge.

    Are you using the upper bridge ignition switches? I think the alarms only work with the active ignition switches. Lower=Lower and Upper=Upper.

    In either case, the question is why? It may be as simple as a bad sending unit.
    P/C Pete
    Edmonds Yacht Club (Commodore 1993)
    1988 3818 "GLAUBEN”
    Hino EH700 175 Onan MDKD Genset
    MMSI 367770440

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      #3
      Buzzer for sure, but why the alarm after 20 minutes? Defective sender or low oil pressure once hot?
      CapMartin, Montreal QC
      "Belle de Dalhousie"
      1986 3270 SOLD
      Volvo BB225B

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        #4
        Any idea where i can check for parts? I've only owned this boat for 4 years. Having needed any parts.

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          #5
          "ltriple" post=820918 wrote:
          Looking for help in identifying a part. (See attachment)

          Buzzing noise starts about 20 minutes after starting the engines. We've traced the noise back to the starboard engine. The noise appears to be coming from the fly bridge.

          All gauges are normal. The part says 4099. The wires attached are purple and green. Any ideas what this could be?
          Did this issue arise after an oil filter change? If you have the hinos, are you sure the element filter was not installed upside down? It happens.
          "Martini's Law"
          1986 Bayliner 3270, 110 Hino's
          Nova Scotia, Canada

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            #6
            Fisheries Supply. About $14. On their website, search 4099. I replaced 2 last year. The purple wire is power and should have 12 volts on it. The green wire comes from the oil pressure switch, oil flow and water temp overheat switches. The buzzer is working if it is making noise and not the problem. With the alarm on take the green wires off the senders, then reattach them one at a time, you can tell which sender is sending the fault signal. The senders are normally electrical open and close (or ground) to make the buzzer sound.

            Jim
            1988 3270 With 135 Hinos

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              #7
              On my 32xx I had a issue that would cause the buzzer on the fly bridge start buzzing when I was running the boat from down below. This was caused by corrosion at the engine wire harness. It's on the back of the engine, it's a large white connector. You might want to make sure it is not corroded by pulling the connectors apart and taking a look.
              1997 3788/Cummins 6BTA 5.9 M2s (Sold)
              2003 Silverton 42c/Cummins 480CEs
              2019 Cobia 240 CC
              2006 Boston Whaler 13 Sport
              1985 3270/Hino 135s (Sold)

              Vero Beach, Fl.

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