Like vscummins has said, if you can remove the valve cover and roll it over by hand slowly, once both valves have closed AND then watch the timing mark on the flywheel. If that mark lines up right after both those valves have closed you are at TDC.
On a gas engine you can pull the number one spark plug and actually feel the compression stroke as air will be forced out the spark plug hole. I don't know if removing the injector on a diesel would get the same results or not. Might depend on how the prechamber is set up.
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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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