Reasons causing abnormal sound of car engine In today's society, the overall performance of automobiles has been continuously improved, and car engines have also achieved unprecedented development. Whether it is in the design, manufacturing, process or performance, control has a considerable improvement, but its basic principles have not changed. Although there have been significant improvements in engine performance and manufacturing, this does not mean that the engine will not have problems. For example, engine noise is a common problem. This is not the case. There was an Anhui customer called in the past two days that the engine that he had bought back every time he started was a little abnormal. The sound was very loud. He wanted to consult us about what was the reason. Because this issue involves professional aspects, I went to the after-sales service department to consult the next. The colleagues in the after-sales service department told me some of the reasons why the engine would be abnormal. Below, I will sort out the reasons why the engine may cause abnormal noise. First, the presence of common abnormal sound depends on the state of engine speed. 1 Abnormal noise exists only during idle or low speed operation. 2 The sound is disturbed at a certain speed, and a brief sound is sent out in succession at the time of rapid deceleration. 3 Abnormal noise occurs when the engine is suddenly accelerating, and the sound remains when high speed operation is maintained. Second, the engine noise and its load has a clear relationship 1 a cylinder off the fire, abnormal noise or no relief. The causes are: piston knocking; connecting rod bearing loose; piston ring leak; piston pin broken. 2 If a certain cylinder breaks the fire, the sound will increase, or it will not sound, and a sound will appear instead. Caused by: piston sleeve copper sleeve loose; piston skirt taper is too large; piston pin spurt out; connecting rod bearing cover fixing bolt loose or even the connecting rod bearing alloy burning melt off the net; flywheel fixing bolt loose even. (3) The abnormal noise of the two adjacent cylinders is relieved or disappeared. The causes are: Crankshaft bearings are loose. Third, the relationship between abnormal sound and temperature 1 The low temperature sounds, and the sound reduces or even disappears after the temperature rises. 2 After the temperature rises, there is a sound, and after the temperature decreases, the sound reduces or disappears. Fourth, engine abnormal noise often has a clear relationship with the engine's working cycle In general, the sizzle caused by a gap that is not related to the work cycle is mostly an engine accessory failure; if it is a continuous metal friction sound emitted by a work piece that has nothing to do with the work cycle, it may be considered that some of the rotating parts are faulty. Fifth, the relationship between abnormal sound and engine parts When the engine abnormal sound, it will inevitably produce a certain degree of vibration, according to the characteristics and location of vibration can help diagnose the cause of abnormal sound.
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