Need to determine just how hard the engine is to turn. With the plugs out you should be able to turn it by hand by turning the crank pulley or the fan, holding the belt tight. If so, the problem s still with the starter, battery, cables or solenoid.
If you determine the engine is indeed seized, start looking for the problem. Look at the color of the rod caps, if one is dark, pull the cap and look at the bearing. The rods should have some side to side play on the crank, easy to feel just by pushing with your fingers. Same with the main bearings, look for color differences, start pulling them and looking at the bearings. There should also be some end play in the crank, not much but a clue if it is seized or not.
Could be a seized piston, not likely since it was running, but worth checking. Remember the side to side play in the rod? Hold turning pressure against the crank, see if one of the rods gets tight and won't move side to side. If so that piston is binding.
Just a matter of searching until you find the problem. Start removing accessories like power steering pump, oil pump, anything that turns with the engine.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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