Power, drive train sound fault can determine - bearing his knowledge

The sound of a car to work the system vibration are collectively referred to as the car noise, some books or referred to as noise. Noise and the noise can be divided into normal and abnormal noise 熞 Yu wipe 犃 sauce Qing yo F car fault is through a lot of sound, sound is a phenomenon, fault is the essence. If not timely troubleshooting easy to cause significant mechanical accident. Automobile common sound mainly can be divided into powertrain sound, drive sound, driving sound louder, wind resistance and so on several major categories. Powertrain sound fault mainly appear in the engine and its relevant parts, sound with engine speed changes, and the frequency is higher. Engine cylinder of fire. The sound is better recognition, sound engine strong jitter, frequency and sound the same as the dither frequency. If encounter this kind of situation, don't panic, find a to the nearest service station to check the engine oil, ignition, gas supply, and the engine computer, troubleshooting. Engine lubrication system work efficiency decline caused excessive friction part. Maybe don't do the oil change for a long time maintain deterioration failure caused by engine oil, or lubrication sealing fall in the oil pressure is not enough, will make the engine lubrication effect, lead to excessive friction parts damage to produce sound. This kind of mechanical vibration frequency of the sound and engine speed ( Incentive frequency) Has a direct relationship, the normal work of the engine speed at 800-5000 r/min. The frequency of the noise is very high, the human ear can only hear the sound of continuous or intermittent time is very short, with increasing engine speed, sound increase in the volume and frequency. Developed the different shape, if your car is about to prepare, at the very least, is the collapse of the abrasion of engine repair the check. Belts, bearing wear to produce sound. Family cars are usually selected in the structure belt drive transfer the power of the engine to the generator, air conditioning compressor, steering booster pump, pump parts, etc. However, due to quality problems or poor working conditions will lead to belt early wear lead to skid. The same problem occurs when the air conditioner bearings, water pump bearings, generator bearing bearing parts. This sounded often harsh voice, high volume and cool car. Judgment method is simple, with a wooden stick ( Or the metal bar, long handle screwdriver, etc. ) Arrive in, in the certain parts of the car came near the sound source sound have obvious change. This kind of failure can be ruled out by changing the excessive wear parts. Drive train sound transmission sound often comes from the gearbox, differential and clutch parts sound change with gear and clutch state present a significant change. Transmission and clutch parts more, are more complex, the causes of noise on the analysis of whether should be paid attention to when associated with a particular situation. Some planetary gear at around 60 km/h speed voice clearly. Shift guy, gear fork exception leads to certain place produce sound. Clutch release bearing wear caused by noise when cutting clutch. There have been such a car repair accident, driving to 110 km/h was strong. After repeated trial found noise engine speed of 3000 r/min, but with the gears to reduce noise and vibration is reduced, the second block and block a voice all belong to normal. Maintenance and troubleshooting of transmission assembly, dismantling. This is a very obvious fault caused by improper transmission and engine matching, sound and vibration appears along with the change of gear are obviously different. Clutch fault and gearbox fault have similar performance, the separation and combination of sound with the clutch state change. As long as familiar with the basic principle, even if the non-professionals can also be to simple drive train sound judgment. Road is a sound of sound and vehicle state ( The speed, steering) Has a direct relationship. Driving system failure tend to focus on the wheel bearing, both inside and outside the ball cage, tie rod head, control arm etc. Wheel bearing early wear will cause a sharp noise, with obvious features: with the increase of the speed and sound frequency increases; Has nothing to do with the engine speed, transmission gear, clutch state. The ball cage and sound in the vehicle steering control arm is obvious. If the sound source is difficult to find can judge the sound through the above characteristics. For repair before the in the mind had a general idea for the fault is of great help to protect its own interests, and can reduce the probability is not regular repair shop man. Wind resistance speed reaches a fixed value sound obvious noise, speed decrease the sound disappeared. Here is a normal sound caused by wind resistance. This kind of sound pressure changes caused by the flow separation around the truck and noise. Specifically including the cavity resonance, conduit pipe noise, and antenna, wipers, mirrors and vibrations cause the spoiler and other accessories. Sealing strip, broken plastic parts can cause body open external curve changes, caused by air disturbing form different driving to high speeds.