Check Indigenous (arrows) and connecting rod (arrows) necks for signs of wear, scratches, pits and cracks.
Rub several times with a copper plate on each neck. If traces of copper remain on the neck, it is too rough, then it must be re-sanded.
Remove any burrs from the oil holes on the shaft with a scraper or file.
Check the shaft for cracks or other damage. In the workshop, use a flaw detector to check for hidden cracks.
Using a micrometer, measure the diameter of the main and connecting rod journals of the shaft, compare the results with the technical data By measuring the diameter at several points around the circumference, you can determine whether there is an ovality. By measuring the diameter at different ends of the neck, you can determine its taper.
Measure the runout of the crankshaft by placing the shaft on prisms.
Attention: The difference in the indicator readings for one complete revolution is taken as the value of the runout.
If the crankshaft journals are damaged, worn, out-of-round or taper out of tolerance, the crankshaft should be reground in a workshop. In this case, oversized bearing shells should be used
Check the seal journals at both ends of the crankshaft for signs of wear and damage. If a groove has formed on the neck from the stuffing box, the new stuffing box may leak. In some cases, the neck can be repaired by pressing a thin bushing into the groove. If repair is not possible, the crankshaft must be replaced.
Check the connecting rod and main bearings.