Thanks for all your help so far. The engine has freed up and turns over now. In the process of getting the hand crank nut off the crankshaft, the engine rolled backwards a bit, and now I can spin it over. With the timing cover off, I see no problems that might have bound it up. Nothing in the gears, nothing out of place. I'm fighting my temptation to just put it all back together. What other things shoud I check before I re-assemble? Should I pull the oil pan to be sure nothing is wrong? Should I pull the engine out of the transmission?
When the engine had first locked up, it had just started to fire after a bit of cranking. Could the pistons be too tight in the sleeves, and when a cylinder or two fired and got warm, did the pistons expand too much and lock up? Or is that not likely? When it was stuck, it was REALLY stuck. I stood on the hand crank and bounced, trying to get it loose (bent my crank, too!).
Any more ideas of things to check before re-assembly will be very much appreciated, John. And thanks again for your help so far!
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