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Take out a spark plug (glow plug if a diesel) place you finger over the hole and manually turn the engine over (there is usually a pully on the end of the crankshaft. Use a good wrench to turn the bolt holding the pully on).
If you feel pressure on your finger then the piston is working.
Generally if it starts and does not make loud banging sounds then the pistons/con rods/big end shells/big ends are ok. If it does not produce lots of bluish smoke when it is at working temperature it is likely the piston rings are ok.
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