Oil removal should be done using solvent and followed by thorough drying of the crankshaft , especially the oil holes which should be achieved using a stiff brush and solvent.Main and connecting rod bearing journals should be checked for uneven wear, scoring, pitting, and cracks, while the rest of the crankshaft should be inspected for cracks and other related damage.Take some measurements of the journals of the main and connecting rod at various points with the help of micrometer of appropriate size to detect the taper and out-of-round conditions of the journal and compare it with the standard measurements. Take measurements at different positions around the journal to find out if it is worn out-of-round, and on the two ends which are diametrically opposite to each other near the throw to ascertain if it has tapered. If the crankshaft journals are cracked, tapered, out of round or excessively worn beyond the permissible limit, get the crankshaft machined again in a reputable automotive machine shop, it is advised that reconditioned crankshafts should have inserts fitted. Look at the main and rod bearing inserts and if all of them are in perfect condition do not think of reusing the bearings until you have a go at the oil clearances.