The cause of the crankshaft ablation analysis and judgment

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The crankshaft ablation, mainly by the crankshaft neck and failed to form effective between oil film bearing, the crankshaft neck and bush directly caused by friction. When diesel engine crankshaft ablatio n occurs, will take the white smoke, a metallic noise, and even cause the crankshaft and bush lock together to turn. Therefore, we must correct analysis of the causes of the fault and judging.precision bearings
The poor quality oil
1) oil inferior quality. Choose oil quality level and viscosity level is low, or different type oil mixed use confirmed, caused by the use of oil performance can not meet requirements; Oil use in the process of mixing a large amount of dust, as well as for diesel engine oil oxidation temperature too high to work. The oxidation of oil is black, no luster, concentration increases, with two fingers twisted oil, feel there is dust in the oil, impurities, etc. If found used motor oil on the above phenomenon, must be timely replacement.
2) the oil is thinning. As part of the diesel engine fuel pump lubrication with pressure lubrication method, once the fuel and lubri cating oil seal failure. Diesel oil into lubricating oil cavity, will make diesel engine lubricating oil dilution. In addition, if there is a crack water jacket or a sand holes porosity, the cooling water into the oil also makes the oil is thinning.
Can check upper diesel engine parts (plane, valve on cylinder head, cylinder head cover shell) whether there is a steam or water. If found that use of the oil increase capacity, concentration, viscosity, and oil smell is explained in the oil mixed diesel.
2 oil inventory is not enough, the oil pressure is low
Oil inventory is not enough, the oil pressure is low, can cause diesel engine lubricating oil flow is insufficient, and cannot guarantee diesel engine crankshaft neck and formed between oil film bearing.
Can check the number of oil in the oil pan and the oil pressure gauge readings, further check the oil for jam, leakage and other anomalies in the pipeline.
3 and the crankshaft journals bearing gap i s too big or too smallbearing roller bearings
1) with the crankshaft journals for bearing gap is too big, the diesel engine oil pressure is low, can not form enough lubricant film.
2) with the crankshaft journals for bearing clearance is too small, and the crankshaft journals between bearing oil film thickness is not enough or no lubricating oil film.
When the appeared gap is too big or too small, can be used micrometer, cylinder form check shaft neck, bearings, bearing hole size, calculate its cooperate with clearance, clearance gauge can be used directly measured with clearance.