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37G, with all you are doing on that "B" you really could use a service manual as there are many interconnected operations that are involved with all you are doing to that "B".. ~OK, now on to your main bearing problems.. To answer your basic question: The crankshaft can stay in the tractor if all you are doing is replacing the main bearings.. Both side main bearing housings unbolt from the tractor case [after the inside oil lines are removed]. The flywheel & flywheel side oil slinger & slinger housing also need to come off.. On the clutch side.. The clutch pulley & related clutch parts & 1st reduction cover need to be removed.. That will give you access to the R/H main bearing housing.. Mark the clutch driver to crankshaft BEFORE removing.. ~Depending on how much crankshaft wear you have, how out-of-round the crank journals are worn, & how much wear on the actual bearings you might just have to remove a few main bearing shims to decrease the bearing clearance to the crankshaft [both side main bearings are adjustable].. If the crankshaft is excessively worn or rusted up you might have to remove the crankshaft & that involves pulling both main bearing housings, oil pump, connecting rods off the crankshaft [mark the rod caps to rod so they go back together the same way].. You should also mark the crank to cam gear position as the factory marks are very difficult to see when reassembling.. There's more but the above are the basics.. ~On the carb?... They aren't too hard to rebuild but there are quite a few things that need doing.. Basically you will need to pull all the brass passage plugs, run wires or long drill bits through the main passages [only the main passages & not the small transfer passages], check the throttle plate for wear & proper centering, check the throttle shaft bushings for wear, pull the load nozzle & clean the side air emulsion holes, clean the bowl vent passage, clean the idle holes with a small wire, file or machine the end gasket surfaces flat, replace the fuel needle & seat, set the float level.. If you haven't been into a DLTX carb before it can be kind of intimidating but isn't all that complicated once you understand what the parts are & what they do.. The other alternative is to send the carb out for a rebuild.. If you want to tackle that carb yourself give me a E-Mail & give me the carb DLTX number & I will send you a carb cleaning picture showing the passages that need attention... [email protected]
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