Hi The first thing you could do is ask Steve when it's apart L.O.L.
From my point of view there will be things you might see before it gets to measuring it that will decide the crank regrind anyway. when I pull an oil pan and bearing caps the first things I look for if it's knocking or got low oil pressure are,
Is there any copper backing material showing where the white metal on some types of bearing could be worn from the bearing inserts, the crank should be measured for wear then.
is there any ridge where some bearing types wear the crank either side of the oil grooves leaving a high narrow band in the middle on what should be an otherwise flat surface across each journal.
Are there any bad scratches or gouges/ white metal stuck to the crank shaft where the bearing got hot/ maybe pounded out and run rod metal to crank metal or welded stuff to the crank messing up what should be a mirror polished surface. the odd time a guy might get lucky and white metal polishes off and the cranks ok.
I've never done a Zetor motor but there are some engines you can't "roll" the rear main bearings in anyway as you can't get the cap off without splitting the tractor to undo bolts in the bell housing behind the flywheel. That might also decide whats coming apart from your findings with that to. anyhow thats what I got to say from general experience looking before getting real technical with a micrometer. Good luck with what you find in there.
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