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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Discussion and discrimination of crankshaft ablation (1) Analysis and Discrimination of the Causes of Crankshaft Ablation (1)
Crankshaft ablation; mainly due to the failure of the crankshaft journal and the bearing bush to form a useful smooth oil film; the crankshaft journal directly conflicts with the bearing bush. When the diesel engine attacks the crankshaft ablation; it will emit white smoke; announce metal impact abnormal sound Sound; even the crankshaft and the bearing shell are locked together and cannot be changed. Therefore, it is necessary to correctly analyze and discriminate the cause of the occurrence of the fault. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1The quality of the oil is poor 1) The quality of the oil is low. The quality grade and viscosity grade of the selected oil are lower; or the different trademark oils are used for blending; the performance of the oil is not up to the demand, and a lot of dust is mixed in the oil application process. And because the working temperature of the diesel engine is too high, the oil is oxidized and transformed. The oil of the oxidized cerium is black and dull; the concentration is increased; the oil is rubbed with two fingers; the oil is found to have dust, impurities, etc. If the oil used is found to have the above appearance It is necessary to replace it in time.
2) The oil is thinned. Because some diesel engine fuel injection pumps are smooth and smooth, the pressure is smooth; once the fuel injection pump and the smooth oil passage seal are ineffective, the diesel oil enters the smooth oil chamber; the diesel engine will be diluted with the smooth oil. In addition, if the water jacket has cracks or Bottom hole; making cooling water into the oil will also make the oil thin.
You can check whether the upper part of the diesel engine (plane on the cylinder head, valve structure, cylinder head cover) can have water vapor or water droplets. If it is found that the oil capacity is added in the application, the concentration is decreased; the viscosity is decreased; and the oil smell is clarified. Diesel oil is mixed in the oil.
2 The oil inventory is not good, the oil pressure is low, the oil inventory is not good, and the oil pressure is low; it will constitute a lack of smooth oil flow of the diesel engine; thus, it can not ensure a smooth oil film between the crankshaft journal and the bearing bush of the diesel engine.
You can check the oil quantity in the oil sump and the reading of the oil pressure gauge; further check the oil pipeline for abnormal appearance such as blockage and leakage.
3 The crankshaft journal and the bearing bush are too large or too small. 1) The crankshaft journal and the bearing bush are too large; the diesel engine oil pressure is low; it cannot be configured to satisfy the smooth oil film.
2) The crankshaft journal and the bearing bush are too close.
When the gap is too large or too small; the cylinder, bearing hole, bearing bush scale can be viewed with a micrometer and a cylinder table; the cooperation gap can be calculated; and the cooperative gap can also be directly measured by the feeler gauge.
4 crankshaft or cylinder size deviation 1) crankshaft radial runout error is large; make the journal and bearing bush gap is small or no gap; smooth oil film thickness is not good or no smooth oil film.
2) The coaxiality of the main bearing bore of the cylinder is too poor; the gap between the main journal and the bearing shell is too small or void; the thickness of the smooth oil film is not good or there is no smooth oil film.
3) The straightness of the cylinder and the main bearing hole is too poor; the gap between the journal pin and the main journal is too small or void; the thickness of the smooth oil film is not good or there is no smooth oil film.
In the case that the diesel engine is not used for a long time after the new machine or overhaul; it will often constitute the above-mentioned appearance. It is concluded that several scales of the excess position can be shaken by hand to crank the diesel engine crankshaft (rotational force); then the diesel engine mains are unloaded by cylinder. Bearing cap and connecting rod bearing cap; re-transform the crankshaft. According to its rotating crankshaft torque, æµ é’œ æµ é’œ 淳咛 淳咛 范 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( (
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Analysis and Discrimination of the Causes of Crankshaft Ablation (1)
Source: China Bearing Network Time: 2014-09-20