1. Wash the crankshaft with solvent and dry, clean the oil passages, clean the journals and remove burrs.
2. Check the condition of the shaft journals, the presence of cracks, potholes, burrs. Check the roughness of the necks by rubbing a copper coin on them. If traces remain, then the necks should be reground. It is recommended to perform an internal flaw detection of the crankshaft.
3. Measure the diameter of the necks in several places and determine the taper and ovality. Check the runout of the crankshaft by installing in prisms.
4. In case of noticeable damage, the crankshaft should be reground and the liners replaced with repair ones.
5. If a deep groove has formed on the necks for the oil seals from the working edge of the oil seal, there are scratches or other damage, then it is recommended to replace the crankshaft, or consult a car service.