I have not and honestly, I would not.
I just freed up the engine in my '51 B. I mean just, 2 days ago.
This tractor was my Dad's and was parked in the basement of his barn. Inside, but humid. I tried atf and kerosene through the spark plug holes for a week plus, rocking the tractor in 3rd gear twice a day. Then I went with atf and acetone for another week, doing the same thing. Then I got smarter and pulled the head off. The exhaust valve on the #2 cylinder was wide open and #2 had surface rust on the bore. I tried atf and acetone for another several days and got, maybe, 1/4" of movement pushing the tractor in 3rd gear.
Then i got slightly smarter and cleaned out the #2 cylinder, removing all of the oily schmoo and filled it with Evapo Rust. In 24 hours, all of the exposed rust was gone. It's not acid and does not eat into good metal at all. I was able to move the piston down another 1/2", which exposed more rust. I put the Evapo Rust back in for 24 hours. No more rust.
After that, I removed the Evapo Rust and put the atf and acetone back in, let it sit overnight, then put a pipe wrench with a cheater on the PTO and firmly (but slowly) pulled clockwise. With just a little pressure, it broke free. It now rotates freely.
Personally, i wouldn't use boiling water because if it doesn't free up, you have introduced a huge source of rust. I also would never again try this without starting by removing the head. I've learned my lesson. For me, it was worth it to take it slow.
Edited by HoughMade - 06 Oct 2017 at 2:09pm
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