Checking the technical condition of the crankshaft

Wash the crankshaft with solvent and dry thoroughly. Be sure to clean the oil passages with a stiff brush and flush with a strong stream of solvent. Remove solvent residues by blowing out the channels with compressed air. Solvent remaining in the oil passages will dilute the oil during the first engine starts, which can cause serious damage. Check the wear of the main and connecting rod journals for even wear, scoring, cracks or local erosion. Check the entire crankshaft for cracks and damage.



Using a micrometer, measure the diameters of the main and connecting rod journals, compare the result with the values \u200b\u200bgiven in the technical data. Check the ovality of the main and connecting rod journals by measuring their diameter at several points along the circumference. Check the taper of the necks, for which measure the diameter of the neck in places near the counterweights (pic. 3.45); compare the results with the values given in the technical data. If a micrometer is not available, then measurements can be taken in workshops for a reasonable fee.

In the presence of damage, as well as if the ovality, taper and wear of the necks exceed the established maximum permissible values, the shaft should be handed over for regrinding to a specialized workshop. After repairing the shaft, it is necessary to replace the main and connecting rod bearings with repair ones.