Thread: Mercury Mark 40-H

  1. #1491
    Jerry Wienandt
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    And what old four cylinders might those be?

    Might want to check your 'Where Used' book...

    I've found nice ones to be scarce. Many are cracked loose at the joint where the tube meets the plate...

  2. #1492
    BoatRacingFacts VIP Aeroliner's Avatar
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    I think from my old parts books the Mark 50 and possibly the MK 40

  3. #1493
    BoatRacingFacts VIP Aeroliner's Avatar
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    Just looked at a couple 40-H and they have them but the friction plate is a bit thinner. Slightly different part number in the data but basically the same size. Also question on the 44XS. Did you build them with new blocks and with no S/N. Have just obtained a red head with no S/N on engine.

  4. #1494
    Jerry Wienandt
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    40H is a different part # in my books.

    All my 44Xs builds had a serial number, the 90 H XXX series on the early ones and the normal B XXXXXX#'s on others. Clones, of course, had production service motor serial #'s.

    Just checked my records... I did work on one with no serial number, but it was used when I worked on it. I didn't build it from new.

    I also replaced a block that had burned down, no water is a bad thing.

    Red Head? Mine were Orange, but anyone can buy a spray can of Allis Chalmers orange. Yes, that is what I used...

    Just curious, what is the assembly match number on case and block on the 'mystery motor' ?

  5. #1495
    Team Member zul8tr's Avatar
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    Quote Originally Posted by Aeroliner View Post
    NO, they look the same but the HG-7 is much smaller. The part I need is 21960 while the KG-7/20-H is 20951.
    Thanks for asking,
    Alan
    Alan from parts page for 30H and 55H the P# is 21906 for the co pilot disk.
    “Extraordinary claims require extraordinary evidence” Carl Sagan

    Location: SW Orlando, Fl

  6. #1496
    BoatRacingFacts VIP Aeroliner's Avatar
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    Hi Jerry,
    The head is orange. The S/N is 90H406 followed by an 8 laying on its side. Did a compression check and all are 155.

    Alan

  7. #1497
    Jerry Wienandt
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    Yup, 90H406 was here... in 2004. It went to +.015" then, full rebuild. Ported to APBA legal spec, Bored, Chamferred, Honed, etc.

    Nice motor as it left here.

    No idea where it has been since the gentleman I worked with sold it.

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