Engine locking up??

I rolled through it just going back and forth with a ratchet checking to see how far it was turning - not with the starter. I wasn't really trying to go through the obstruction, just listening for the noise of the clunk to get a location. I agree with you, I wouldn't try to force it!

Believe it or not it's very easy to do major damage even with a short ratchet. Back in the mid 80's I worked as a maintenance man at a trailer mfg and they had a little Toyota pickup for running parts. The timing chain jumped and I got the job fixing it even though I knew nothing about Jap technology. Told the boss he should buy me a serv manual cause it had several things to line up and I'd only be guessing on how it went together but he was too cheap. He bought the chain/gears/guides and I put it together the best I knew how. Thought I'd be safe and just roll it over with a ratchet and when I did I felt 4 bumps that felt like compression. WRONG! With a 3/8 ratchet and very little effort I bent all 4 intake valves. I hope you didn't damage anything and sorry about the novel, just pointing out it's never a good idea to force anything. Even if you think the force your applying isn't much. I wish you the best in finding the problem easy