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Mark 30 Help

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  • #16

    Re: Mark 30 Help

    cpizze1
    The 1956-1958 Mercury Mark 30 has long been my favorite merc of all time. I've had dozens of them; incl several 30H's.
    As far as your motor's provenence, if you bought it from Aeroliner I would give it my blessing. Their stuff is always top notch.
    I set my mains (on the bench) at 1 1/8 turns out from lightly seated and the pilots at exactly one turn out from seated. Just make sure you snug up the packing nut on the mains...I can tell in about 1/2 second it one has loosened up on mine.

    Test wheels are not too hard to find for a 30H; I would imagine Aeroliner has a few. They have tons on stuff...also check Outboard Paradise.
    Joe Poole Jr (Ferguson/Poole Marine) is not far from you; Joe is a Mercury WIZARD and extremely helpful/knowledgeable
    Another great resource for old merc's is the John's Old Mercury website- there are some very sharp guys on there and they will fall over backward to help getting an old merc singing
    Feel free to call me at 717 919 4726
    522-P
    Last edited by squirrelboydeluxe; 06-17-2018, 04:18 AM. Reason: Forgot to mention JOM



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    • cpizze1
      cpizze1 commented
      Editing a comment
      Found my test wheel. Next time I get it in the water it will really be helpful. Someone else mentioned timing as well...so I think I will try adjusting the timing too as the throttle opens.

  • #17

    Re: Mark 30 Help

    these vintage 4cly mercury's are known to stall out when put into gear when the idle mixture is too lean, this being a race motor always in gear and if you had the prop on when starting in water would react the same if too lean, easiest test is enrichen the carbs as previously mentioned by others .... nice ride

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    • cpizze1
      cpizze1 commented
      Editing a comment
      Thanks for the info. I also found my test wheel so that will help next time I have it in the water.

  • #18

    Re: Mark 30 Help

    Update!

    So I had time to take it to the lake and try a couple of things. First, the was a small air leak in the tank fitting to the fuel pump I fixed. Second, I put a smaller prop on the motor and last adjusted the high speed (slightly) on the carbs. Pulled the first time and ran great! Not the fastest thing around (heavy boat), but ran pretty good!

    Thanks "ALL" for the great advise!

    Coady

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    • #19

      Re: Mark 30 Help

      With the 1:1 gears the prop shaft center should be about 3/4 inch below the bottom. A suitable prop would be about 6 1/2" dia and about 9" pitch. The engine needs to get in the 6,500 RPM range to make good power. Looks good on the water!

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