Motor can be used for both piston engine and for electric motors. The word engine is normally used only for steam or gas or diesel powered motors, like you have in most cars or trucks. Engines have tolerances between their parts, but you don't normally speak of a motor having tolerance.
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messier"strain" and "stress" and "load"?These are good synonyms but not entirely ftting to this particular sentence.
messierA motor and a engine have a tolerance.