2. Check the main and connecting rod journals for uneven wear, scratches, corrosion, and cracks.
3. Run a copper coin across each neck several times. If copper remains on the neck, then it is too rough (see illustration).
4. Remove burrs from the crankshaft oil holes using a file or scraper.
5. Using a micrometer, measure the diameter of the crankshaft main and connecting rod journals, and compare the results with specifications. Carefully check that the diameter of each neck is within the allowable limits for the corresponding size group. If any measured diameter does not fit the indicated group, re-measure (see illustration).
6. By measuring the diameter at several points around each neck, you can determine the ovality of the neck. And by measuring the diameter at the edges of the neck, near the counterweights, you can determine the taper of the neck.
7. If the crankshaft journals are damaged, tapered, oval, or wear exceeds the Specifications values, the crankshaft must be reground to the next size and an appropriate repair set of liners must be purchased. Skoda manufactures three different repair groups for main and connecting rod bearings and thrust washers. For these questions, contact your Skoda dealer or an engine overhaul specialist with the appropriate equipment.
8. Check the oil seal locations at each end of the crankshaft for damage and signs of wear. If the oil seal has a deep groove in the crankshaft journal, consult a specialist to determine the possibility of recovery, or replace the crankshaft with a new one.
9. Using a micrometer, measure the thickness of the crankshaft thrust washer, and compare the measurements with the data in Specifications (see illustration). If any of the thrust washers are worn, replace both washers. Please note that after regrinding the crankshaft, one of the thrust washers will be thicker than the other. The thicker washer is always installed inward (those. next to the crankshaft counterweight).