I've never tried air pressure, I've even heard of people pumping the cylinders full of grease and the hydraulic pressure breaking them loose but I would not ever try that. Personally I would remove the head and soak the cylinders some more and then take a block of wood and a hammer and tap on the tops of the pistons. Then take a breaker bar and socket and put on the bolt on the crankshaft pulley and see if it moves any. If it doesn't repeat the process. Just keep working at it. I don't rock the tractors when the engine it stuck because a lot of the time the clutch will slip before it break the engine loose. Especially if the clutch is worn.
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