Don't pull the head just yet. Let the PB Blaster soak in good, keep spraying it. If you can, give it several days to soak.
Try the hammer again, a small hammer, more shock than beating. If it will go down, it should come back up. Try 2 large screw drivers on each side of the spring, try to pry up, equal pressure on each side so not to bend the stem. The object is to get it to move, just a little, just enough to break it loose so more PB can get down the stem. You might get lucky and it will come loose and pop shut. If it does, keep tapping it with the hammer, pry down on it to free it up. Just be careful not to push down on the spring retainer. The keepers will fall out and the cap will come off. Not that big a deal to put it back on, just more hassle.
Once it is free, put the pushrod back in, adjust the lash, get it running and watch it to be sure it stays free. Also watch the rocker assembly to be sure it is oiling. Won't oil much, just drip, but all the rockers must show some sign of getting oil.
After it has run a while, shut it off and adjust the valve lash again.
There may be a reason it was stuck. Hopefully it was just condensation or rain. But a head gasket or cracked head can also get moisture in the cylinder. Time will tell. The strings tied to the rockers? Who knows, someone has been there, maybe marking them as they were adjusted? Who knows.
Since you are going to be working on, and finding more problem areas, a shop manual would be a very valuable investment. It will more that pay for itself in mistakes not made!
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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