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  1. #1
    New Member
    Join Date
    Oct 2010
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    12
    Tractor
    Farmall M

    Default Farmall M Engine Knocking

    Hey everyone. I have a Farmall M with a loud knocking noise coming from the number 1 cylinder. Tractor will hardly move,misses and knocks loudly and is definately down on power. If the number one cylinder wire is unplugged the tractor runs without knocking albeit down a cylinder. There is also some oil blow by coming out of the air filter. Anyone have any suggestions? Thanks....

  2. #2
    Elite Member
    Join Date
    Sep 2010
    Posts
    4,085
    Location
    ONTARIO
    Tractor
    MASSEY, CASE , FARMALL

    Default Re: Farmall M Engine Knocking

    It sound like you have a sparkplug wire hooked up wrong which is causing big ignition advance in that cylinder. If it was a bearing or a wrist pin they wouldn't stop knocking when the plug was disconnected. It might be two of the 4 cylinder plugs are on the cylinder but only one is firing early enough to effect the engines sound and performance. Any other info on how this occurred. After changing plugs, working on distributor, ect.

  3. #3
    New Member
    Join Date
    Oct 2010
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    12
    Tractor
    Farmall M

    Default Re: Farmall M Engine Knocking

    My dad had the distributor cap off but that is it.

  4. #4
    Elite Member
    Join Date
    Sep 2010
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    4,085
    Location
    ONTARIO
    Tractor
    MASSEY, CASE , FARMALL

    Default Re: Farmall M Engine Knocking

    When it was off were the plug wires removed. If so there is a slight chance that one plug was put on the wrong plug at the distributor. I don't know the firing order but you might be able to take one plug out at a time and check to see if it is firing around top dead center on each cylinder. If two are out of time try switching them around and see if it makes a difference. Before you go pulling plug wires, label the order of which one goes were.

  5. #5
    New Member
    Join Date
    Oct 2010
    Posts
    12
    Tractor
    Farmall M

    Default Re: Farmall M Engine Knocking

    No the wires were not removed.

  6. #6
    Member Kiwi Farmall's Avatar
    Join Date
    Mar 2011
    Posts
    48
    Location
    Mossburn ,New Zealand
    Tractor
    1941 Mccormick Deering Farmall A and 1947 Mccormick Deering W4

    Default Re: Farmall M Engine Knocking

    Go back to the basics and check the timing of the distributor ,check the cap has number one lead inline with the rotor when at TDC on cylinder number 1.Check plug gaps .It will something simple like that,as these are a basic system.Firng order will be 1-3-4-2 but I am not sure of the rotation.

  7. #7
    New Member
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    Oct 2010
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    12
    Tractor
    Farmall M

    Default Re: Farmall M Engine Knocking

    Thanks I will give it a shot tomorrow.

  8. #8
    New Member
    Join Date
    Oct 2010
    Posts
    12
    Tractor
    Farmall M

    Default Re: Farmall M Engine Knocking

    Checked it out today. Started up no problem but was still knocking. We unplugged the number one wire and it went away. Plugged it back in and the knocking noise was still gone. It did come back after a few minutes. Going to change plugs, wires, cap,rotor, condenser and points tomorrow.......

  9. #9
    Veteran Member
    Join Date
    Jan 2009
    Posts
    2,114
    Location
    Carroll, Ohio
    Tractor
    Massey 180 Diesel

    Default Re: Farmall M Engine Knocking

    I'd suggest copper core wires.

  10. #10
    Super Member
    Join Date
    Apr 2000
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    6,181
    Location
    central New York
    Tractor
    all makes and models

    Default Re: Farmall M Engine Knocking

    Seen this before, yes number one has something wrong! To miss match plug wires or disconnect them will get rid of the noise because there is no load.

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