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  1. J

    Water in D Cylinder

    And with antifreeze, worse than not needed.
  2. J

    Water in D Cylinder

    The valve is not connected.
  3. J

    Water in D Cylinder

    I suppose you're right. Lookin insteada guessin'll answer it.
  4. J

    Water in D Cylinder

    After sitting all summer I went to start my D today, and antifreeze blew out of the left cylinder. Last spring when I started it after cutting wood all winter it smoked white steam the first minute or so that it'd run, then as it warmed up it quit. Today it was obviously burping slimy green...
  5. J

    John Deere 520 (whats it worth)

    Now's your chance to get rid of that box seat altogether, put the battery between the frame in front of the head, and mount a good riding pan seat on a spring off an A or a G. Of course, no one would buy it that way, but your back would be happier if you intend to use it in the field. I don't...
  6. J

    Resistance in D Switch

    My D is 12 volt, and I made the mistake of putting in a 6 volt switch. Oops. The resistor in it doesn't have enough resistance to affect the field, so it puts out 17+ volts, and my batteries overcharge and die an early death. (They also undercharge at idle.) I haven't been able to find the...
  7. J

    Which Manifold (for the D)?

    Interesting. Thank you very much for showing us. That one keeps the intake completely separate. Do you notice a horse power difference between the different manifolds if all else is the same?
  8. J

    Which Manifold (for the D)?

    Interesting. Thanks. I wonder what they rated the HP for it or if they had to say the same as the all fuel model, since it wasn't tested at Nebraska. I've always thought they should have continued developing the D instead of turning out that underdeveloped R with all its problems (no center...
  9. J

    Which Manifold (for the D)?

    Reasons?
  10. J

    Which Manifold (for the D)?

    Thanks. I'll probably need heat to get the nuts loose, so more room is better. Ugh on the fuel tank and fan shaft. Double ugh.
  11. J

    Which Manifold (for the D)?

    It looks like I could almost, just about, get the manifold off and back on without pulling the front of the tractor apart. Anybody here manage to do that? Can't seem to lay my hands on my repair manual thingy, though it's about one step this side of worthless, with so many other tractors...
  12. J

    Which Manifold (for the D)?

    Sounds like good guesses. Thank you.
  13. J

    Which Manifold (for the D)?

    Awe shucks, guys. I have that parts book right on my shelf. How did I forget to look at it? Maybe cuz most of my machines are so old they don't have a parts book. Least, that's me excuse. Sheesh. Sure can see how the intake has less exhaust/heat contact on the gas design--now that you point...
  14. J

    Which Manifold (for the D)?

    I've been looking for a different manifold (still debating dual exhaust or not) for my '47 D, and I found two online that are a bit different. (Not planning on buying either of these but want to know what to get when I do.) Why the differences? Is one an aftermarket? Did Deere change the...
  15. J

    D Manifold Questions

    Yeah, I know whacha mean. The 1870s are when I wish I'd lived: steam trains, sailing ships, horses and corsets. Sigh.
  16. J

    D Manifold Questions

    Except that the early D (steel wheels) manifolds had 4 bolts and the later D (rubber tires) manifolds had 6.
  17. J

    D Manifold Questions

    Thanks. There's 90+ feet of line shaft in the shop and 30 or so old machines belted to it. The reclaimed, stale gas makes it more-or-less practical or at least affordable. I don't mean to turn this thread into a shop topic, but if it interests you, here's a video of my wife working one of the...
  18. J

    D Manifold Questions

    Hey thanks. Actually I discovered that it was compression-igniting when I noticed one day that my coil was disconnected--but it was running along fine, spark-free. I couldn't believe it at first, and it took me awhile to remove the spark and coil system altogether. Since I wrote that...
  19. J

    D Manifold Questions

    Far out. I'm gonna give this some thought and get back again. Thank you. Here's an article I wrote on this for the Gas Engine Magazine back in 2012. It's not nearly as technical as your explanation, but you might like to read it...
  20. J

    D Manifold Questions

    It sure doesn't make kerosene, and you're the first person who's come close to explaining it. The weird thing is, the mixture has a lower ignition temperature than straight kerosene does. Now why would that be? With metals, when you add an alloy the melting point becomes lower than the...
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