1. Use a whetstone, file or scraper to remove burrs from the edges of the oil holes.
2. Wash the crankshaft with solvent, then dry thoroughly using compressed air if possible. Don't forget to clean the oil holes with a stiff brush. Then also wash them with solvent.
Remember to wear protective goggles when using compressed air!
3. Check the crankshaft main and connecting rod journals for scoring, cavities, cracks and signs of uneven wear.
4. Inspect the entire surface of the shaft for cracks or other damage. To identify hidden cracks, you should resort to magnetic particle flaw detection - give the shaft to a car service workshop.
5. With a micrometer, measure the diameters of the main and connecting rod journals of the shaft. Measure the diameter of each neck at several points along the length and perimeter, which will allow you to evaluate the value of its taper and ovality, which should not go beyond the allowable ranges (see Specifications). You should also evaluate the amount of runout of the crankshaft - you will need a pair of V-shaped blocks and a plunger-type dial gauge (see illustration Measuring the amount of radial runout of the crankshaft). If you do not have the necessary equipment, contact a car service specialist for help.
6. In the event that the wear / taper / ovality of the necks exceeds the permissible value, or mechanical damage to the surfaces occurs, the crankshaft should be turned into a groove. After turning the shaft, it is necessary to select new liners for the main and / or connecting rod bearings of the appropriate repair size.
7. Check up a condition of omental necks on both pins of a cranked shaft. The presence of developed grooves, burrs or scuffs will lead to the failure of new oil seals in the very near future. In some cases, the trunnions can be restored by turning and pressing special thin-walled bushings onto them. If this kind of repair is not possible, replace the shaft.
8. Check the condition of the main and connecting rod bearing shells (see Checking the condition of the main and connecting rod bearings of the crankshaft).
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