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4.3 Mercruiser Thunderbolt IV base timing

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  • 4.3 Mercruiser Thunderbolt IV base timing

    Most of us know the Thunderbolt V has a purple wire that needs to be grounded to set the timing in order to stop the auto advance. But what about the Thunderbolt IV on a 4.3 Mercruiser? I'm trying to time it right now and can't find how to put it into base timing mode. The Mercruiser Service Manual doesn't mention it in the timing section and I know there is no purple wire to ground on the Thunderbolt IV.

  • #2
    Re: 4.3 Mercruiser Thunderbolt IV base timing

    The Thunderbolt IV system does not get put into base timing mode.
    Don S.


    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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    • #3
      Re: 4.3 Mercruiser Thunderbolt IV base timing

      Ayuh,.... The T-Bolt IV is simply attach the timing light, point,+ set....

      Comment


      • #4
        Re: 4.3 Mercruiser Thunderbolt IV base timing

        Duh... I just spent 2 days lookin for the damn thing! I should have just visited iboats first. My manual covers several years but doesn't specify the Thunderbolt IV doesn't have the wire.

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        • #5
          Re: 4.3 Mercruiser Thunderbolt IV base timing

          Once again, Thank you all very much!

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          • #6
            Re: 4.3 Mercruiser Thunderbolt IV base timing

            My manual covers several years but doesn't specify the Thunderbolt IV doesn't have the wire.
            That is because when the TBolt IV system was used, there was no such thing as TBolt V and putting things into base timing. So why would they specifically say not to put in base timing mode ???????
            Don S.


            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


            • #7
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              Re: 4.3 Mercruiser Thunderbolt IV base timing

              Originally posted by Don S View Post
              Quote:
              My manual covers several years but doesn't specify the Thunderbolt IV doesn't have the wire.
              __________________________________________________ ______________________
              That is because when the TBolt IV system was used, there was no such thing as TBolt V and putting things into base timing. So why would they specifically say not to put in base timing mode ???????
              Ayuh,...

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