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If you really have a '38 UTS and it has two cylinderheads, you've either read the serial number wrong, or its got the wrong engine in it, because MM didn't make a split-block U engine until about 1948. If it's a '38 it will have a grille screen that reminds you of a '32 Ford. If your heads have different size plugs, check the casting number. Chances are one starts 'GE' and the other starts '10A' So far, I've fixed 2 U engines and a G engine. two of them were stuck. I've heard of soaking engines in Marvel Mystery Oil, Olive Oil, Diesel Fuel, Penetrating Oil-so I guess PB Blaster counts. To get mine unstuck, I've never been able just to soak one free. I drove 2 engines apart with an oak post I turned to fit the bore and a sledge. The last time, I just put the block of wood on the piston and put my 8-ton jack on top. Then I put a loop of my heaviest log chain around the oil pan and across the top of the ram on the jack and used the jack to force the piston down. If you try any of this, DO THIS AT YOUR OWN RISK! As far as an "in tractor" overhaul Its kind of relative: you can't get the big end of the rods to go up the 4-1/4" bore, so you have to take the blocks off anyway. The way I'll do it next time is drop the oil pan, take the heads and blocks off, then determine if I'm going to take the crankcase off/out of the tractor.
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