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The wear of the crankshaft can be measured using a micrometer. The wear of the crankshaft short journal is mainly to check the roundness error, and for the long journal, the roundness and cylindricity error must be checked. The specific measurement method is as follows: two sections are taken for each journal, and two points are taken for each section. Half of the difference between the largest diameter and the smallest diameter of the same section is the roundness error; half of the difference between the largest diameter and the smallest diameter in the two sections is the cylindricity error. Under normal working conditions, the amount of wear of the crankshaft is extremely small, generally not exceeding 0.01 mm, and the cylindricity is below 0.0025 mm.
Common forms of damage to the crankshaft include journal wear, cracks, burns, bends or breaks. We can analyze the working condition of the engine and the cause of the damage from the crankshaft wear state. For example, the crankshaft wear amount is too large, and the bearing bush even leaks the ground color. This situation is generally caused by poor lubrication, low oil pressure, and oil not meeting the requirements of use; the cylindricity of the crankshaft is too large, indicating that the engine is working at a large load for a long time. Crankshaft burns, blue, and locks must be caused by poor lubrication. The most common is the lack of oil.
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