Case 841C stuck, need help

I bought a 1968 Case 841C from a neighbor a few months back hoping to get it going. The motor is stuck, trying to get it free, and its got me baffled. All 4 cylinders are stuck. Cylinder 2 and 3 are almost to the top of the stroke, 1 and 4 almost to the bottom, only about 15 degrees to go to be TDC/BDC. I have the heads off, oil pan, and rod caps. This motor looks to be rebuilt not too long ago. I want to save the pistons and sleeves as they are expensive for this tractor, the diesel motor is a lot cheaper. I made up a 8' long bar to go on the PTO to try to turn it over, PTO clutch is slipping when I put too much pressure on it. Starter is also out and have pried on the flywheel. I also tried using grease before I pulled the heads off and didn't have any luck. I currently have a bottle jack and a 2x3 up under pushing up on the bottom of the sleeve to get it free, but all it did was jack the tractor up. I tried heating the bottom of the sleeve to soften the orings to help get it out, but I can't see anything or get the torch up in there easily. I'm almost to the point of splitting the tractor to pull the crank and to get at em easier. im open to ideas. not wanting to bust out the pistons at $450 each, or the sleeves at $200 each.

Any ideas?

Had the same problem with mine my brother got a little rough and
destroyed my pistons and liners case want 1100 dollars each so I used
1030 diesel pistons and liners had to cut the block but it worked
anyway after all that had another engine stuck dumped plain old coke
soda on the pistons let set a few hours engine broke free and spun
over coke has a acid in it that eats rust give it a try and then
you'll never drink one again

If you ever have bad luck with breaking a piston on your 830 I do have a few good useds one for you. . my e mail is [email protected]

Mix transmission fluid and diesel fuel together 50/50 and pour it into the cylinders and keep the sleeves wet for several days
and then try to tap the pistons up and down and turn them.

I use a steel slug, 1/2" thick and a piece of 2 1/2" shaft 12" long to pound on the pistons. The slug spreads the load on the piston when hammering. 3-4 whacks on the two in the same position and 3-4 on the other two. Working back and forth it takes awhile to move anything.

I ended up splitting the tractor after noticing a rust line coming from the center main bearing. I pulled the engine apart and knocked out the sleeves, alot easier with it upside down. Number 4 piston was the easiest to unstick. A few taps with a block of wood and a plate, it was out. Number 1 took more but was fairly easy. Number 2 and 3 were the worst, destroyed a 4x4 with out moving them, the 5 ton press at work didn't budge them. Ended up getting one without the wood and hitting the plate directly. The other one moved a bit that way but got stuck again. Put in under a 20 ton press and it resisted but moved. Had to push on the rod end to get it out of the sleeve, I think I bent the rod just slightly. Some new rings and sleeve oring are on order and now a rod, and it'll be ready to go back together.