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Power, transmission system, abnormal noise can identify

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The sounds announced by various systems during the operation of the car are collectively referred to as the sound of the car; some books are also called noise. These sounds can be divided into two categories: normal sound and abnormal sound. If you don't remove the problem in time, it is easy to form a serious mechanical problem.
The common abnormal sound of a car can be divided into several major categories: powertrain abnormal sound, transmission system abnormal sound, traveling system abnormal sound, and wind resistance abnormal sound.
The abnormality of the powertrain is mainly presented in the engine and its associated components; the abnormal sound varies with the engine speed; and the frequency is higher.
1. The engine is broken and the engine is broken. This abnormal sound is better than the same; the abnormal sound is fierce with the engine; and the sound frequency is the same as the frequency of the vibration. If this happens, don't be nervous; look for a service station to check the engine oil supply and incineration. , gas supply and engine computer; remove the problem.
2. The efficiency of the engine smooth system is reduced, resulting in excessive collision of the machine parts. Perhaps the engine is not damaged by oil change for a long time. The engine oil is not damaged due to the smoothing of the seal; the smoothness of the smooth seal may cause the oil pressure to fail; the smoothing effect of the engine will be reduced; Excessive damage to the abnormal sound. The sensation frequency of this mechanical noise is directly related to the engine speed (encourage frequency); the normal operating speed of the engine is 800-5000 r/min. The frequency of the noise is very high; the human ear can only listen. A short sound in succession or continuous time; followed by an increase in engine speed; abnormal noise is added in both volume and frequency. If your car presents the above-mentioned abnormalities; be prepared mentally; at the very least Crash engine repair to see the wear condition.
3. Belts and bearings wear abnormally. Household cars generally choose belt drive to transmit the power of the engine to generators, air conditioner compressors, power steering pumps, pumps, etc. However, due to quality problems or poor working environment, it will incur The early wear of the belt leads to slip. The same problems often occur in air bearing bearings, water pump bearings, generator bearings and other bearing parts. This abnormal sound is often sharp, high volume and cool car. The method is simple; use one The root rod (or metal rod, long handle, etc.) is placed on a certain part of the car; the sound is significantly changed when the noise is close to the abnormal sound source. This problem can be removed by replacing the excessive wear parts.
The abnormal sound of the transmission system abnormal sound transmission system often comes from the abnormal changes of the gearbox, differential, clutch and other components with the gear and clutch condition changes.
There are many transmissions and clutch parts; the reason for the sound is also complicated; in the analysis and discrimination, we should pay attention to whether it can be related to a specific situation. Some planetary gears sound significantly at a speed of about 60Km/h. Shift cable, hanging gear The fork often causes an abnormal noise to hang some specific gears. The clutch is away from the bearing wear and causes noise when cutting and clutching.
I have presented such a repairing end car; the journey to 110 Km/h is intense. After repeated test runs, it is found that the engine speed is 3000r/min with noise; but with the gear position is reduced; noise and sensation are reduced.è°¡. Disassembly and repair of the gearbox assembly; fault removal. This is a very serious problem caused by the gearbox and the engine are not properly matched; the abnormal sound and the sensation are significantly different with the change of the gear.
The clutch problem is similar to that of the gearbox; the abnormal sound changes with the clutch's separation and contact status. Only the basic principle is known; even non-professionals can make a simple discriminant of the abnormal sound of the drive train.
The abnormal sound of the traveling system is directly related to the car's traveling condition (vehicle speed, steering).
Traversing problems often occur in wheel bearings, crown cages, tie rods, steering arms, etc. Early wear of wheel bearings can cause sharp noise; and with significant features: add with speed; add abnormal frequency It has nothing to do with engine speed, transmission gear position and clutch condition. The abnormal sound of the cage and the control arm is more obvious when the vehicle is turning. If the sound source is difficult to find, it can judge the abnormal sound condition through the above characteristics. It is generally known that there is a great deal of assistance for the protection of personal interests; it can reduce the probability of being deceived by a wrong-track repair shop.
Wind noise, the speed of the vehicle reaches a fixed value, the noise is remarkable; the speed is reduced. The noise is abnormal. The abnormal sound caused by the normal wind resistance is the noise generated by the airflow around the body. It is said that the cavity consensus, the duct pipe noise, and the accessories such as the antenna, wiper, rearview mirror and spoiler are sensational. The opening of the sealing strip and the breakage of the plastic parts will cause the external curve of the body to change; the air turbulence caused by the high speed Abnormal sound.

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