I'd go back to the basics....an engine needs three things to run 1) Spark, 2) compression, and 3) fuel. I'd pull the plugs and run a compression check on all cylinders making sure that they are all within 10% of each other. It's a safe bet that you have good compression since the tractor runs on diesel (but it's still worth a check as there could be a problem with the gas side of the valving). Next, I'd check each spark plug by grounding on the side of the engine and making sure that all fire hot while turning the engine. If you get good compression and good spark, then you can turn your attention to the fuel side.
Remember, part of the switch-over mechanism are two butterfly valves that close the air off from the carburetor. I know that when I pulled my intake manifold off my MD, I had to make sure that the switch made this valve function properly when I re-installed.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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