How do you unlock a locked up motor on my tractor?
I tried putting rust dis-solver in each cylinder. I fired it up one day and when it warmed up it stuck. It had plenty of oil, I think some one put sugar in my gastank. Tried turning the crankshaft with a wrench and it won't budge. Could a piston ring broke and got lodged, it's an old tractor, but always starts in bitter cold weather or no matter how hot it gets from long periods of work.
Update:Cylinders contained no water, only one holds oil for a long period of time. I meant penetrating oil in stead of rust dis-solver. It was running and just locked up. Water was in radiator, gasoline when I drained the tank looked brown. "maybe a Snickers bar"
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Pull the spark plugs on all cylinders and then see if it will turn over. If you have a cracked head or blown head gasket it could be letting a cylinder fill with water and then it would be locked up.
rust disolver is a acid based chemacle. try puoring some penetrating oil into the cylinders and let it sit for a few days. leave plugs out and try to crank and push out the oil. if it turns over. its good to go. re install the plugs and fire up.
or...........
the acid might have disolved a seal and the cylinders might also be full of oil or water. you need to check each one. pull all plugs and try to crank over the engine. water or oil will not compress.
id say your best bet is to just take apart the engine and examine it but i dont know how much work u wana have to do