1941 Farmall H: Seized Engine Update/Advice

After taking some advice from forum members here, I set out to unsieze my tractor. Cylinders 1,2 and 3 looked ok, but all got an ATF bath. Cylinder 4 however had quite a surprise.
Upon removing the spark plug I saw that there was some gunk in there, so I proceeded to shoot some compressed air through the plug hole. What came out had the most vile scent I?ve ever come across.
Quite a bit of brown sludgy liquid came pouring out. I can only surmise that a mouse must have crawled in through an open valve and either died and liquified, or just used cylinder number 4 as his personal toilet.

From what I could see with a borescope camera, there seems to be no nest or any other foreign matter.
Hopefully she comes unstuck!

Anyone else ever see anything like this?
 
I have a D-17 A/C that was not locked up but 3 out of the 4 cylinders had what appeared to be mouse nest in them. Took a good bit of ATF and spinning it over to clear them out. In your case I would wick out that cylinder then mix about 25% Heet with ATF shake it up good and then fill the cylinder with that mix. Also pour as much ATF down the exhaust as you can till it starts to leak out some place. If a mouse go in likely it would be the exhaust valve it got in from
 
I think that you will end up pulling the head, I really doubt ATF will fix a cylinder that had liquid sitting in it.
 
Sounds like there was liquid water still in the cylinder. That needs to come out first, or the ATF will just float on top, not get down in the ring area.

If there is still water in it, keep blowing it out, or tape a small hose to the shop vac to get it out.
 

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