A year ago I bought a wrecked Jeep with only 70,000 miles on it for the motor and some parts, I got it all swapped over to my jeep knowing it was a good motor, when I went to start it it would not turn a bit! Tried every mixture of oils recommended by everyone, wait wait wait, nothing.
So I popped the head off and found this! I cleaned the cylinders out the best I even honed what I could, nothing. A customer came in and saw the motor and said it looked similar to a tractor motor and told me he had great luck with pouring warm water about 180* in them to break them loose, so I heated water on the wood stove in a metal five gallon bucket, about three gallons of water and dumped it in the jacket holes best I could till it was full.
It broke lose right away about five minutes after I dumped it.
I have a about 15,000 miles on it since then. Runs great!
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