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4.3L Mercruiser timing

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  • 4.3L Mercruiser timing

    I have a distributor and coil, but have electronic ignition. Where does the shunt clip from and to when trying to make the electronic advance go to 'base' timing? What does a 'shunt' look like, and can I make one myself?


  • #2
    Re: 4.3L Mercruiser timing

    The shunt plugs into the ignition module. You'll see there's two sockets, one is used and one is covered. It plugs into the covered one. I think the pins are too close together to make your own, and they're cheap so it's not really worth it anyway. It looks like a plug with a loop and another wire...
    Full Gallop
    1998 Larson 176 Flyer
    VP 4.3GSLK
    VP PJX PowerJet

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    • #3
      Re: 4.3L Mercruiser timing

      I think the first thing one needs to know is what distributor you have, and what year?
      The Thunderbolt IV or V doen't take a shunt at. The TB4 times like a point system, the TB5 has a method of putting into base timing, but it's not a shunt.
      Only the EST distributor requires a shunt.
      Don S.

      sigpic

      Please, no PM's (Private Messages) regarding boat/engine problems.
      That is what the forums are for.
      Only forum/moderator issues will be answered in PM's.

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      • #4
        Re: 4.3L Mercruiser timing

        It's a common looking 6 cylinder distributor like in a car. It has 2 wires coming out the front base-one white/green stripe and one white/orange stripe. On the back of the distributor is a mounted module with part # 807829-1 on it. It's about 2 1/2 " by 3 1/2 " by 1/2 " thick. It says 4.3LX/LXH Alpha on it. I believe it is an electronic advance system and the distributor has no points inside. I am not familiar with the Thunderbolt IV/V terminology. I hope this helps. Thanks.

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        • #5
          Re: 4.3L Mercruiser timing

          Could you post the engine serial number?
          Of those who receive good advice, only the wise will profit from it.

          If you need it....Get it
          If you want it....Wait
          If you have it....Flaunt it


          sigpic

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          • #6
            Re: 4.3L Mercruiser timing

            0k033551

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            • #7
              Re: 4.3L Mercruiser timing

              Of those who receive good advice, only the wise will profit from it.

              If you need it....Get it
              If you want it....Wait
              If you have it....Flaunt it


              sigpic

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              • #8
                Re: 4.3L Mercruiser timing

                Thanks for that Reel Poor. Here are a couple of tidbits from Mercruiser Tech in Stillwater, OK I found. I hope it's ok that I post their # here. 405-743-6566
                I spoke with a great guy named Brad and he shipped these items down to me lickity split. It really helped. I found the Purple/White wire at the bow/starboard of the engine just laying there waiting to be used! It had a female push plug attachment. I made a wire with a male push plug attachment/round hole connector and voila' that's all there was to it.
                Got the timing set to 8 deg/BTDC, tightened the distributor and it was still right on 8 deg/BTDC. Thanks to you all for your help.
                Attached Files

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                • #9
                  Re: 4.3L Mercruiser timing

                  Not a problem but will have to pass on the thanks to Don S for originally posting the outline.
                  Of those who receive good advice, only the wise will profit from it.

                  If you need it....Get it
                  If you want it....Wait
                  If you have it....Flaunt it


                  sigpic

                  Comment



                  • #10
                    Re: 4.3L Mercruiser timing

                    Then my thanks to Don S as well. Cheers! Happy boating all.

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                    • #11
                      Re: 4.3L Mercruiser timing

                      All well and good for the Thunderbolt V, but I have a Thunderbolt IV on a 1989 4.3 Mercruiser and I'm trying to time it right now and can't find how to put it into base timing mode. Service Manual doesn't mention it in the timing section and I read on Iboat forums that there is no purple wire on the Thunderbolt IV.

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                      • #12
                        Re: 4.3L Mercruiser timing

                        Start a new thread with your question. not a dozen posts in on someone elses 2 year old post.
                        Don S.

                        sigpic

                        Please, no PM's (Private Messages) regarding boat/engine problems.
                        That is what the forums are for.
                        Only forum/moderator issues will be answered in PM's.

                        Comment


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