You're getting good advice about the starter and potentially missing tools. If it all checks out, though, and no one can come up with any better ideas, think about the following.There are two ways you can approach this problem. You can continue to try to figure out exactly why the engine won't turn over and fix that problem, hoping when you put everything back together there will be no other serious problems and you can go back to work. This is potentially the most efficient way to attack this problem in terms of time and money, but there are no guarantees. However, this is an engine that blew a head gasket, and then was run until it overheated. Now it is frozen up. Many people would at this point consider writing this motor off and rebuilding it or having an expert rebuild it for them. Or maybe they might look for another tractor with a good engine and swap them. This is especially true if when the tractor was overheated, it was overheated to the point where any grease or oil that might have been on the side of the engine started to bubble. This is, of course, the more expensive path, in terms of money and time. It is also the most inconvenient. But it is the most likely to ensure a tractor that operates reliably for the long term.
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