The crankshaft bearing sound judgment method and processing steps

The crankshaft bearing sound judgment method and processing steps - 2018 11 - 02 a, 1, preliminary confirmation fault judgment method: observe the oil pressure, engine oil pressure drop is more obvious. In the oil filling mouth examine listens, sudden changes in speed, the thrum of the low 'boring, boring, compared to the crankshaft bearing ring. 2, using the method to confirm break fault: single cylinder is broken fire, noise, no change, and the adjacent two cylinder break fire, the noise will be significantly weakened. Three specific diagnosis, engine under different rotational speed. , engine in a medium speed and acceleration or deceleration, accelerated significantly larger, main bearing loose kuang ring; B, the vibration of high speed when the body has a larger engine, vehicle load grade, cab and a sense of vibration, the oil pressure drops apparently, for the bearing clearance is too large or alloy, should be timely repair; C, engine working temperature is normal, when the speed by low speed increases, a 'boring, boring has rhythm and the sound of heavy, the higher the temperature, engine noise, the more obvious, to high-speed noise into the mixed and disorderly, may be the crankshaft bending. Second, the main damage to parts and processing method 1, according to the component failure probability from big to small in turn as follows: the crankshaft main bearing ( Big watts) , the crankshaft thrust slice, the crankshaft. 2, the best way to deal with: overhauling the engine cylinder block and crankshaft main bearing replacement ( Big watts) , the crankshaft thrust piece; If the crankshaft bending correction or replacement of the crankshaft should circumstances. （ BMW automobile maintenance)