The Dongfeng Yufeng generator suddenly cuts off the power and restarts. Check for abnormal noise. 1. Learn to distinguish abnormal noises from reasonable noises.
The problem of abnormal car noises. is intended for ordinary car owners. It's hard to tell which noises are faulty and which are legitimate. If you go to a repair shop to check for an abnormal noise, only about 20% of cars actually have a problem. There is obviously a difference between the noise of a model equipped with a turbocharged engine and the noise of a naturally aspirated engine; models equipped with a crankcase may also produce noise due to friction, some car owners may be affected by theirs; noise after contacting different cars. Lack of understanding of mechanical knowledge, confusing reasonable abnormal noises with a vehicle breakdown. ApSo take care to identify abnormal car noises to avoid wasting time and energy.
2. How to identify car noise:
In actual work, due to the limitations of working conditions, it is difficult to use special instruments to measure car noise. the “click-click” sound of a small hammer hitting the cement floor.
1. Correctly distinguish between normal and abnormal sounds.
When the car is running, the vibrations of various mechanisms will make sounds of different kinds, but the sound does not mean that the car is defective. In order to avoid unnecessary disassembly, you must first distinguish what is normal. abnormal sounds and sounds. Engine and exhaust noises from various system components, gear noise, etc. are all normal sounds. Abnormal noises (abnormal noises) can be divided into light noises, normal noises and malignant noises based ontion of their impact on the performance of the car. Slight noises, such as the flashing sound of high-voltage electrical leakage, the slight rolling noise of bearings, etc., are generally small in volume, the degree of wear of the parts is not large, and it does not There is no significant change for a long time. Such defects can still keep the car without repair normal driving.
3. When diagnosing abnormal car noises, attention should be paid to creating good auscultation conditions and trying to eliminate interference from other noises so as not to affect the accuracy of judgment.
It is best to consciously amplify or reduce the sound, that is, use a screwdriver or other metal rod as a stethoscope to contact the sound part to amplify the sound , or use a single cylinder to cut off the fire to reduce the sound, to meet the diagnostic needs. THEThe auscultation site must remain quiet to minimize human interference.
3. Below we list some common abnormal car noises that are easy to eliminate along with simple methods of identification and elimination.
1. There are abnormal noises in the body
Explanation of symptoms: When you drive and step on the accelerator or when braking, there are always abnormal noises in some parts of the body. .The sound is not loud and does not affect normal operation, but there is always a little worry that something is wrong.
Problem analysis: This problem usually occurs because the rigidity of the body is insufficient, causing the vehicle to deform while driving, the door and frame to rub or shake, or desoldering to certain places causes friction between the steel plates. , etc. .
Some cars also havelouder wind noise. To some extent this has to do with the shape of the car. In some cars, body parts are not properly secured and may be the cause. abnormal noise. Generally, tighten the screws. This can be resolved.
Solution:
First check whether there are any loose objects in the trunk or on the rear seats that are easy to roll and make noise, and remove the noise caused by certain elements that are not correctly fixed.