Re: Stuck engine -- Now what???
One thing that has not been mentioned is heat.
I have used it successfully in one form or another in hundreds of stuck situations.
In this case you might begin with placing the engine in the sun or in warm room for an extended time.
The introduction of hot water to the cooling jacket could help.
If jammed rotating parts are eliminated as the cause, then stuck pistons (even one) might be your emphasis.
Good luck
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