Tuesday question! Boat edition

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    Tuesday question! Boat edition

    3.0 mercruiser dieseling. Fucked with timing a bit yesterday with no luck.
    Carb or??
    It's my uncles poontoon boat, just trying to help him out a bit.
    TIA.

    #2
    run higher octane and see if that stops it


    "For God and country, Geronimo, Geronimo, Geronimo"

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      #3
      How old is the fuel? What do the plugs like? Have you pulled plug wires to see if you have a dead cylinder or ignition issues?

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        #4
        Originally posted by Paragon View Post
        run higher octane and see if that stops it
        Premium, non ethanol

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          #5
          Originally posted by Pat McRotch View Post

          Premium, non ethanol
          Check for a dead cylinder if fuel is fresh enough.

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            #6
            Originally posted by Thefishguy77 View Post
            How old is the fuel? What do the plugs like? Have you pulled plug wires to see if you have a dead cylinder or ignition issues?
            1) Don't know, I'd have to ask him. He takes care of his shit so I assume he drained the tank after the last use of the year.

            2) i didn't pull plugs last night

            3) didn't pull plug wires either.

            Boat ran fine when parked. I'll ask him these questions when he calls me back.

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              #7
              Fucker ain't answering his phone. I'll be back with more info shortly.

              Comment


                #8
                Originally posted by Pat McRotch View Post
                Fucked with timing a bit
                .
                Randomly moving stuff or using tools to time it correctly? The OMC I just got says in the manual that it will diesel if it's timed for 93 and you run 89 or worse in it.

                .

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                  #9
                  Mercruiser distributors are different than pretty much everything out there in that era. The timing needs to be set with the engine at or under 700 rpm. You set it at 8 degrees advance and tighten her down. The distributor advances thru the little brain box tied to it with I think 4 wires. There is no advance inside the distributor. It’s all done electronically thru the little box. If you have it idling above I think 750 rpm the box has already started to advance the timing.

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                    #10
                    Fuel is from a few months ago, with stabil in it.
                    Engine has 240hrs.
                    Compression test was done when he bought it, 1yr ago. Compression was good.
                    Plug wires look good, haven't looked at the plugs.

                    Comment


                      #11
                      Originally posted by rockdog57 View Post
                      Mercruiser distributors are different than pretty much everything out there in that era. The timing needs to be set with the engine at or under 700 rpm. You set it at 8 degrees advance and tighten her down. The distributor advances thru the little brain box tied to it with I think 4 wires. There is no advance inside the distributor. It’s all done electronically thru the little box. If you have it idling above I think 750 rpm the box has already started to advance the timing.
                      That's good to know. Thanks for the input.

                      Comment


                        #12
                        By dieseling, what exactly do you mean. Around chere it means running after shutoff


                        "For God and country, Geronimo, Geronimo, Geronimo"

                        Comment


                          #13
                          Originally posted by Paragon View Post
                          By dieseling, what exactly do you mean. Around chere it means running after shutoff
                          It does around here to buddy, so yes.
                          Last edited by Pat McRotch; 06-09-2020, 08:04 PM. Reason: Fat finger

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                            #14
                            Uncle found a couple loose wires. I asked, "to what?"
                            him: fuck if I know but it's good now! throwing a timing light on it now since we fucked with the distributor..

                            He says it shuts off fine, starts fine. All is good.

                            Thanks for the input dickbags!

                            Comment


                              #15
                              Originally posted by rockdog57 View Post
                              Mercruiser distributors are different than pretty much everything out there in that era. The timing needs to be set with the engine at or under 700 rpm. You set it at 8 degrees advance and tighten her down. The distributor advances thru the little brain box tied to it with I think 4 wires. There is no advance inside the distributor. It’s all done electronically thru the little box. If you have it idling above I think 750 rpm the box has already started to advance the timing.
                              I put an HEI on my Merc 4.3, 1/3 of the cost and got rid of that hassle.

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