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37G, the pistons come out the front of the block after removing the ridge from the front of the cylinders & the nuts from the rods on the rear [inside the crankcase]. Start by removing the ring ridge at the front of the cylinders with either a ridge reamer or CAREFULLY grind it out with a stone & dremel [I prefer the ridge reamer if you can find one to fit].. Then remove the crankcase cover & use a center punch & mark the rods caps to the rods [& rods for original side] I usually put a single punch mark on the top of the L/H rod & cap & 2 marks on the top of the R/H rod & cap.. Once the rods are marked, remove the caps [keep the shims in proper order & tagged for location]... Then bump the pistons out of the front of the bores.. ~If the ridge is big & you can't easily remove it just pull the block with the pistons in it, then pull the pistons out the rear. ~On measuring the cylinder wear? Seeing as you are asking it sounds like haven't done it before... In that case your best bet is to take the pistons & cylinder block to a local machine shop to have them evaluated & measured.. There are other factors like ring side clearance [very important], & bore taper, & bore out-of-round... You will need precision inside & outside mics & feeler gages to measure the bore wear & ring side clearance.. Most machine shops have a bore gage that they can sweep around the cylinder bore & get a very accurate measurement of the bore.. There is also some visual traits you need to look for.. While at the machine shop,, if the block is good & bore wear is within limits you can have them hone it for you [probably cheaper than buying a good cylinder hone].. If this is your first Deere engine you really need an expert machinist look at those parts for you.. ~On the aluminum pistons,, they will raise the compression so the engine sound will be slightly different. ~On the crankcase cleaning?... Once the block & rods are out of the way you can use a garden sprayer with kerosene in it & use old rags, a gasket scraper, stiff parts cleaning brushes, & lots [did I say LOTS] of elbow grease & you can get that crankcase cleaned out.. ~You have lots of other concerns like bearing clearance, out-of-round wear on the crank journals, main bearing wear, oil pump condition, governor gear & bearing wear, fan gear & bearing wear, crankshaft wear where the clutch pulley rides, piston pin hole wear, cylinder head cracks, valve wear & valve stem wear.. & that doesn't even include what could be wrong with the transmission or transmission bearings.. When you get your manual you will be better prepared to tackle the insides of that engine but should probably still get an expert machinist's input on the engine pistons & cylinder bore.. [email protected]
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