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I worry about the compressed air method, because once the air breaks the rings loose, you could shoot the pistons to the bottom of the bore with considerable speed. You can easily break things like that. Here's something I've been thinking of doing on my Case VAIW with a stuck motor. Rig an adapter for your grease gun to the sparkplug holes. Remove the rocker shaft and be sure the valves on the selected cylinder are closed. Remove all the spark plugs. Start pumping grease into one of the cylinders, then move to the next and then the next. You may even want to see about working a bunch of grease into the cylinders before hooking up the adapter. You want to get as much air out of the cylinders as possible before hooking up the adapter. Go slowly. Work a little on one cylinder, and then a little on the next. Remember that you will have a bunch of hydraulic advantage with a grease gun. If you do not go very slowly, you can bend things. Regardless, this method has the advantage of more control. The hydraulic pump idea will not be as nearly controllable as the grease-gun idea. Both of those methods have the advantage of the fact that fluids are not compressible. So, once you let off, everything should stop. With the air method, once you let off, things will keep moving until the air has decompressed.
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