In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

McCormick Deering WD6

Discussion in 'Chainsaws and Power Equipment' started by J. Dirt, Jan 2, 2017.

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  1. J. Dirt

    J. Dirt

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    By the way I found out the walnut shells cracking were actually walnut shells, just not in the pump! :yes: Under the fan, in the exhaust and about anywhere else you could think to find one.
     
    J. Dirt, Sep 10, 2017
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  2. MasterMech

    MasterMech The Mechanical Moderator

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    I still remember how to get one of those started. Throttle has to be pushed all the way forwards and then the engine gets started much like a gas tractor. Once it starts to show a little temp on the gauge, pull the throttle back until the engine starts to sputter. Give her just a tad more fuel, grab the big lever to switch 'er over and pull like it owes you money! She'll sputter and carry on for for a second and you're off! And always shut 'er down on gas too.
     
    MasterMech, Sep 10, 2017
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  3. cwn877

    cwn877

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    IMG_20160518_164703008-2672x2004.jpg
    J. Dirt here is a really nice salvage yard about an hour from me. He has a bunch of tractors and decent prices.
     
    cwn877, Sep 10, 2017
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  4. J. Dirt

    J. Dirt

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    Sounds like they way I remember firing up my uncles MD. I'll have to get a video up when I get her running!!
     
    J. Dirt, Sep 10, 2017
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  5. J. Dirt

    J. Dirt

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    :salute::handshake:
     
    J. Dirt, Sep 10, 2017
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  6. brenndatomu

    brenndatomu

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    No kidding?! I would have never guessed that...hows that work? I would think it would pre-ignite like crazy being hot already...
     
    brenndatomu, Sep 10, 2017
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  7. cwn877

    cwn877

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    The old tractors where all like that. Most used kerosene or distillate fuel. You had to start them on gas and run for a bit to warm up then switch to the other fuel and just the opposite when shutting them down. Most where hand cranked to get started and if you didn't switch to gas before shutting down hopefully you had another tractor, truck, or neighbor to pull you. Must of why those tractors needed heat to start is that the kerosene and distillate fuel had to vaporize in the warm manifold to burn. Now the gas to diesel engines worked on the same principal but the fuel is atomized in the injector. The motors also closed part of the combustion chamber to raise compression for the diesel to run. Because diesel burns slower and most diesel engines run on a lean mixture they don't build much heat. This is before glow plugs, block and intake heaters so the gas was used to build he to start the detonation process for the diesel. If you had warm weather and a fairly new tractor they would restart on diesel but that wasn't the norm. The older engines were also lower compression and less fuel pressure than more modern diesels.
     
    cwn877, Sep 10, 2017
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  8. MasterMech

    MasterMech The Mechanical Moderator

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    When you switch these engines between the two fuels, they run different valvetrains and ignition/fuel systems.

    https://www.dieselworldmag.com/tractor-talk-1941-farmall-md-diesel-first-of-the-breed/
     
    MasterMech, Sep 10, 2017
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  9. J. Dirt

    J. Dirt

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    J. Dirt, Sep 11, 2017
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  10. brenndatomu

    brenndatomu

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    Well I'll be dipped...those old timers were clever old buzzards!
    So I still don't get why it had to be shut down on gas...why not just cut the diesel and shut 'er off?
    The only "start on gas" tractor I'm familiar with is the neighbors old 720 JD with a pony motor...think he has an 820 too
     
    brenndatomu, Sep 11, 2017
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  11. cwn877

    cwn877

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    You could just shut the diesel off and let it die but switching to gas made restarting faster and easier. Not as big a deal with electric start.
     
    cwn877, Sep 11, 2017
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  12. MasterMech

    MasterMech The Mechanical Moderator

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    I was sternly warned never to shut-it down on diesel and I never grew old/bold enough to try it.
     
    MasterMech, Sep 11, 2017
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  13. J. Dirt

    J. Dirt

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    Snapped a pic this morning quick. You can see the two regular valves then the little cap my finger is pointing to has the starting valve under it which drops compression as well as opens the combustion chamber to were the spark plug is. It's operated off of a cam shaft that links to the handle up at the seat. The handle also opens butterfly's in the intake manifold to allow carb mixture to flow into the cylinder as well as un-grounding the magneto. IMG_1613.JPG
    This is just a shot inside the tapper cover IMG_1614.JPG
     
    J. Dirt, Sep 11, 2017
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  14. brenndatomu

    brenndatomu

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    Interesting machine!
     
    brenndatomu, Sep 11, 2017
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  15. MasterMech

    MasterMech The Mechanical Moderator

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    Run one and you'll be hooked. Reading this threads brings back memories of how that engine barks when switching it over to diesel. Sounds just like a regular gas M when it's warming up but has a unique and distinct sound once you switch it over.

    J. Dirt, that first successful yank on that lever is going to be real satisfying!! Can't wait, hope you do a video!
     
    MasterMech, Sep 11, 2017
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  16. Eric VW

    Eric VW Moderator

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    X2!
    That would be neat to see and hear!:yes:
     
    Eric VW, Sep 11, 2017
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  17. J. Dirt

    J. Dirt

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    Got the camera on charge already!
     
    J. Dirt, Sep 11, 2017
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