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    ignition issue-gctid827977

    Having issues using the Mallory YLM624AV distributor and ballast resistor. Thanking about using the MSD marine distributor which does not require a ballast resistor. Any thoughts?

    #2
    What kind of issues are you having?
    Joel
    1987 3818 Hino 175
    "Knotty Girl"
    Prince Rupert B.C.

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      #3
      agree with canoel, what are the issues?

      I had the same dissy's on one of my boats and the only issue we had was the bushings for the centrifugal advance weights wore causing erratic running, especially idling. After replacing the bushings, the dissy's worked fine for many years.

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        #4
        Unless the bushings go bad and cause an issue, the YLM 624 AV is a good unit.

        It uses VR for the triggering system.

        The AV is for a Std LH Rotation Engine.

        Do not used any conductive material that may contact the reluctor and sensor unit simultaneously.


        Rick E. Gresham, Oregon
        2850 Bounty Sedan Flybridge model
        Twin 280 HP 5.7's w/ Closed Cooling
        Volvo Penta DuoProp Drives
        Kohler 4 CZ Gen Set

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          #5
          This is a new distributor. To answer the question of what issues, After I'm out and running, I the engine dies and will intermittently start after a brief rest but will die within about 3 minutes. I now I have fuel, because the carb will still squirt fuel. I changed out the magnetic ignition module and ballast resistor with new ones. During the test to check the voltage, there was a constant voltage of 12 volts all the way through the resistor to both sides of coil. With the ignition switch in the on position there should be 12v coming from the key switch to the bottom side of the resistor with 6-8v coming out the top to the coil. Thus the thought of going with the MDS marine distributor which does not require the ballast resistor. The sbc 5.7 is a standard rotation motor.

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            #6
            If you are not getting a voltage drop thru the resistor it is bad (shorted). You can confirm this by disconnecting it and taking an ohm reading with your VOM.

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              #7
              Resistor is bad, and maybe the coil is heating up causing the no start.
              Joel
              1987 3818 Hino 175
              "Knotty Girl"
              Prince Rupert B.C.

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                #8
                I put that exact distributor on both engines on my Chris Craft, but I did need to change the coils, as it needed to provide more power to operate properly.

                UPDATE: Just read your other threads to see what boat you have and found this: "I'm running Mallary YLM624AV with a Mallary High output coil (9-29716), using a ballast resistor." Seems you have the right coil.

                On that note, please fill out your profile so we don't have to go through your other threads to find out what boat and boating experience you have. Just click on your name, then EDIT.
                "B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
                MMSI: 367637220
                HAM: KE7TTR
                TDI tech diver
                BoD Puget Sound Anglers North Olympic Peninsula Chapter
                Kevin

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