19.1. The edges of the oil holes must be rounded to avoid scratching new bearings
2. Clean the crankshaft with solvent and dry it with compressed air (if it exists). Be sure to clean the oil holes with a stiff brush (see illustration) and wash them with solvent.
19.2. Use a wire brush or a brush with stiff artificial bristles to clean the oil grooves in the crankshaft
Attention! Wear protective goggles when using compressed air.
3. Check for signs of uneven wear, scratches, corrosion on the shaft journals for the main bearings and connecting rod bearings "ulcers" and cracks.
4. Wipe each neck several times with a copper coin (see illustration). If traces of copper remain on the surface of the neck, it must be reground.
19.4. By rubbing a copper coin against each shaft journal, the condition of the journal surface can be determined (if traces of copper remain on the crankshaft, regrinding of the necks is necessary)
5. Check up, whether there are no cracks and other damages on other parts of a cranked shaft. It is necessary to carry out special sounding (Magnaflux) to detect hidden cracks. This can be done at an auto repair shop.
6. Using a micrometer, measure the diameters of the journals for the main bearings and connecting rods and compare the results with the specifications in this chapter (see illustration). By measuring the diameter at several points along the circumference of each neck, you can determine the degree of ovality of the neck. To determine the degree of taper, measurements must be taken at each end of the journal near the cranks.
19.6. Measure the diameter of each crankshaft journal at several points to check for taper and ovality
7. If the crankshaft journals are damaged or their taper, ovality, or wear exceeds the allowable limits given in section "Technical data", take the crankshaft to a car repair shop for regrinding. Keep in mind that after rebuilding the crankshaft, bearing shells of a different size will be required.
8. Check for signs of wear and damage on the journals on which the seals operate. If the seals have rubbed the grooves on the necks or there are scratches or signs of abrasion (see illustration), then after assembling the engine, new oil seals may leak. In some cases, car repair shops restore necks by pressing thin sleeves on them. If repair is not possible, a new or rebuilt crankshaft must be installed.
19.8. If the oil seals have worn the grooves in the crankshaft journals or there are scratches or abrasions on the surfaces under the oil seals, new oil seals will leak
9. Check the main bearing shells and connecting rod bearings (see section 20).