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Whoa! Don't try to turn it over with the starter motor or towing the tractor. You're likely to break something very expensive! You don't yet know where the engine is seized. Check the engine oil for colour. If brown (water present) the problem may be rust in the bottom end. Or it may be a seized piston or a jammed governor weight in the timing case. Don't start forcing anything. I'd suggest remove the plugs, fill the cylinders with diesel fuel, kerosene or Jet A1 with around 10% light machine oil. Let it sit for a few days - longer if possible. If the fluid in the cylinders drains down, fill with more. Then, with the spark plugs out gently try to rock the engine over with the hand starting crank. If it turns over keep cranking by hand until the engine appears to turn freely. If it turns over freely, drain all oil, fit new filter and fill with new oil, then try to start on the starter motor. If it is jammed solid, don't force it! If it doesn't turn over by hand, check your bank account to see if you can afford a full engine overhaul. A Standard engine full overhaul is cheaper than you may imagine - full engine kits, including sleeves, pistons, bearings and gaskets should be around $400. If you have the tools, a good manual and a little mechanical knowledge, the engine is simple to rebuild. There really isn't much to go wrong with the Standard engine. It is simple and one of the most robust engines the British ever built, having also been fitted to Vanguard cars, Triumph sports cars - and over 10 years installed in half a million Little Grey Fergies!
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