2. Check the crankshaft main and connecting rod journals for wear, corrosion and cracks.
3. Wear of the connecting rod journal is characterized by metallic knocks during engine operation, especially under load, at low speeds and a decrease in oil pressure.
4. Wear of the crankshaft main journals is characterized by strong engine vibration and metallic knocking, which increases with increasing engine speed, as well as a decrease in oil pressure.
5. Check the crankshaft journals for roughness. Any noticeable roughness indicates that the crankshaft needs to be reground or replaced.
6. If the crankshaft has been reground, check for burrs around the oil holes. If there are any, remove them with a fine file or scraper and thoroughly clean the holes and passages of chips.
[The original can be read on the website: ToyotaMAN]
7. Using a micrometer, measure the diameter of the main and connecting rod journals of the crankshaft and compare the results with the technical requirements. Measure the journals at several points both along the diameter and along the length of the journal, which will allow you to identify ovality and taper, if they are present.
8. Inspect the oil seal contact surfaces at each end of the crankshaft for wear or other damage. If the journal wear from the seal is severe, the crankshaft may need to be replaced.