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I've heard of a car engine with a broken crankshaft, but that is a rare occurrence.

What happens if you turn the motor by hand?
(Might be best to remove spark lead and spark plug.)
First, turn the flywheel side and hold the PTO end.
Does the PTO end turn with the flywheel side or not?
Observe if the piston moves up and down.

Then turn the PTO side and hold the flywheel end.
Does the Flywheel turn with the PTO?
Observe if the piston moves up and down.

Out of interest, what is the condition of the oil?

Kind Regards
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