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New Merc 140 Distributor with different dwell and point gap specs??

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  • New Merc 140 Distributor with different dwell and point gap specs??

    Ok, first post so bear with me.

    Merc 140 (S/N 2522192) out of a 1972 Glasspar. Replace original distributor with a Mallory YL673AV which also cross references with part number 19514-1 and 18-5315.

    Per manual, gap and dwell is .022 and 31-34* respectively for original setup.

    Upon research I find the following specs from a Service Bulletin to use with 19514-1:

    MCM 120, 140, 2.5L, 3.0L (S/N 0C856558 and Below) With Prestolite Distributor (which makes Accel, Mallory electronics)
    Distributor Part Number: 19514 1 (This is the replacement distributor for the Delco which is NLA).
    Distributor Advance: 28°
    Initial Timing: 8° BDTC
    Total Advance: 36° @ 2100 RPM
    Point Gap and Dwell: .016 in. (0.4 mm), 39° - 45°

    URL for this info is: http://www.boatfix.com/merc/bullet/95/95_11.PDF


    I compared the Mallory vs. the Delco and the cam surface (where points ride against) is markedly bigger. Is that why the new specs are in place.

    Just trying to understand before I get this thing on the water.

    Thanks for your help.

    bigherm


  • #2
    Re: New Merc 140 Distributor with different dwell and point gap specs??

    Ok, got some views but no advice. Mybe I will simplify the question:

    For those who have purchased a Mallory (Sierra, etc) distributor for their Merc 140 to replace the original, what gap and dwell settings did you use?

    bigherm

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    • #3
      Re: New Merc 140 Distributor with different dwell and point gap specs??

      Merc used 2 different distributors Delco and Prestolite. How they compare to the Mallory I can't say but here are the specs on each of mercs distributors.

      Click image for larger version

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      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



      • #4
        Re: New Merc 140 Distributor with different dwell and point gap specs??

        Ok, thanks. Mallory is a brand of Prestolite, so those specs should jive. Thanks for posting both specs side by side, sure makes it easier to compare.

        bigherm

        Comment



        • #5
          Re: New Merc 140 Distributor with different dwell and point gap specs??

          Mallory is a brand of Prestolite
          No, Mallory may have made a copy of a Prestolite distributor, but they are two different companies.
          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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