2. Solvent remaining in the oil passages will dilute the oil during the initial engine starts, which can cause serious damage. Check the uniformity of wear on the main and connecting rod journals, the presence of scoring, cracks or local erosion. Check the entire crankshaft for cracks and damage.
3. Measure the diameter of the main and connecting rod journals with a micrometer and compare the result with the value given in the manual. Check the out-of-roundness of the main and connecting rod journals of the shaft by measuring their diameter at several points around the circumference. Check the taper of the journals by measuring the journal diameter in places near the counterweights and comparing the results. If a micrometer is not available, measurements can be taken in workshops for a reasonable fee.
4. If there is any damage, or if the ovality, taper and wear of the journals exceed the established limits, the shaft should be submitted to a specialized workshop for regrinding. After repairing the shaft, it is necessary to replace the main and connecting rod bearings with repair ones.
The article is copied from the website MAZbook.ru