Analysis of several situations of abnormal noise in the car site?

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Loose chassis generally occurs in older cars, when the car is driving in bad road conditions, the steering wheel will feel unstable, the bottom of the car will also come out of the abnormal sound, usually the old driver can feel the overall a little loose, when encountering such a situation, it means that the chassis may be loose, and the reasons for this situation are divided into several, only by understanding the reasons, can we better prevent this problem from happening.

The first reason is the aging of rubber parts, we all know that the elasticity of rubber is particularly good, which can buffer the friction between parts and reduce noise at the same time. However, this kind of thing has a lifespan, and it will age after a long time, and the elasticity is not as good as before, so the buffering capacity will decrease, resulting in abnormal noise in each part, so it is necessary to check these rubber parts regularly and replace them in time.

The second possibility is the reason for the shock absorber, the main role of this part is to inhibit **, when the car is driving in the dustpan section, it will have an impact with the road surface, and the shock absorber can well ensure the smoothness of the car, if the shock absorber is damaged, there will be a scoop phenomenon, so that the chassis is loose, so usually check the shock absorber, if there is a leakage to repair in time.

The third is the clearance of the parts, that is to say, the ball head may be loose, this part is like the joint of the human body, if the ball head is loose, there will be a large gap between the lever and other connected parts, if the gap is too large, when crossing some dustpan roads, the screws between the subframe and the suspension will be loose, then the chassis will become loose, so usually check these two parts. Thank you.

Abnormal noise includes abnormal engine noise, clutch abnormal noise, transmission abnormal noise, final reduction system abnormal noise, brake abnormal noise, steering abnormal noise and body abnormal noise. The abnormal noise of the car is an abnormal phenomenon and is a manifestation of the car failure or a precursor to the failure. If there is an abnormal noise in the car, it must be that a certain part is working abnormally or damaged, so once there is an abnormal noise, the owners must check.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. Models equipped with turbocharged engines distinguish between sound and natural suction; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that due to their lack of understanding of mechanical knowledge, they mistake reasonable abnormal noise as a vehicle failure.

Therefore, learn to distinguish the abnormal noise of the car and avoid wasting time and energy.

Second, the identification method of car noise:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the sound of the impact bridge of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the noise of gear meshing are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of 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 screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.

Check to see if there is a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

The automobile chassis is composed of four parts: the transmission system, the driving system, the steering system and the brake system. The function of the bottom Hu is to support and install the automobile engine and its various rough parts and assemblies, form the overall shape of the car, and accept the power of the engine, so that the car can move and ensure normal driving.

In general, the causes of abnormal chassis noise are roughly as follows:

1. Interference between parts.

Possible cause: The two parts affect each other due to impact or the installation of other equipment.

2. Loose bolts or nuts.

Possible reasons: a. Driving on the road with poor road conditions for a long time, the bolts are naturally loosened;

b. Improper disassembly and installation of bolts damage;

c. The tightening torque is not enough or the bolt specification is wrong.

Solution: Tighten or replace the bolts and nuts.

3. The universal joint of the transmission shaft is faulty.

Possible causes: Dust cover cracked or oil leakage caused by failure to repair in time.

Solution: Replace the new transmission shaft universal joint.

4. Abnormal noise caused by damage to each ball joint, suspension and connecting bracket.

Possible causes: After long-term use, the ball joint is loose or the rubber liner is aging and crackingSolution: Replace the ball head or support pad with a new one.

5. Abnormal noise of braking system.

Possible causes: a. Loose brake pads, brake calipers or brackets;

b. Brake pad or brake disc failure;

Solution: Check whether the braking system is loose and whether the brake pads and brake discs are abnormally worn.

6. Abnormal noise of hub bearing.

It occurs at a certain speed, with a "buzzing" sound, and increases with the increase of vehicle speed.

Possible causes: Most of them are caused by ablation of hub bearings.

Solution: Replace the wheel bearings with new ones. (It is recommended to replace both sides at the same time) 7. Abnormal tire noise.

Possible causes: a. Problems with the tires themselves.

b. Abnormal tire wear.

Solution: Check whether the tire is abnormally worn, if there is, check whether the chassis is loose and improperly assembled, etc., if not, it is a problem with the tire itself.

8. Abnormal noise of the transmission.

Possible causes: Worn internal gears or low oil.

Solution: First check whether the transmission lubricating oil is sufficient, if there is no external failure, you can only unpack and check.

9. Clutch abnormal noise.

Generally, there will be an abnormal sound after pressing the clutch pedal.

Possible causes: Separation bearings are caused by less oil wear.

Solution: Replace the release bearing with a new one.

10. The chassis makes abnormal noise when passing the speed bump.

This is the most commonly encountered, and it involves a lot of scope, generally interference between parts, loose bolts and nuts and damage to shock absorbers without oil.

Hope my answer is helpful to you, thanks

We all know that the chassis is composed of four systems: the drive train, the driving system, the steering system and the brake system. It is an important part of the whole vehicle, with many parts and a wide distribution. So we have a lot of trouble judging it.

Causes of abnormal chassis noiseIn general, the causes of abnormal chassis noise are roughly as follows

We all know that the chassis is composed of four systems: the drive train, the driving system, the steering system and the brake system. It is an important part of the whole vehicle, with many parts and a wide distribution.

So we have a lot of trouble judging it.

The cause of the abnormal sound of the chassis.

In general, the causes of abnormal chassis noise are roughly as follows:

1. Interference between parts.

Possible cause: The two parts affect each other due to impact or the installation of other equipment.

2. Loose bolts or nuts.

Possible reasons: a. Driving on the road with poor road conditions for a long time, the bolts are naturally loosened;

b. Improper disassembly and installation of bolts damage;

c. The tightening torque is not enough or the bolt specification is wrong.

Solution: Tighten or replace the bolts and nuts.

First of all, it is necessary to find the cause of the abnormal noise of the car chassis

1. There is a fault in the tire, and the car tire is a very important part of the car, which is in direct contact with the ground and plays a role in carrying the weight of the car and ensuring comfort. The service life of tires is generally linked to the degree of wear, but there are some special circumstances, such as tire studs, tire bulges, etc., which will shorten the life of tires. At the same time, loose tire screws or insufficient air pressure are also one of the causes of abnormal noise;

2. The brake system is also a non-negligible part of the car, under normal circumstances, you can first judge the vacuum booster pump connected to the brake pedal to see whether it has air leakage and oil leakage, and the simplest judgment is to feel whether the strength of the brake pedal is the same as before. In addition, the brake pads are also prone to abnormal noise, and the sound is very harsh. Pay more attention to the brake system and replace the brake pads in time to avoid brake failure;

3. The wheel bearing "buzzes", and the bearing that some friends have just replaced will be broken in less than half a year, and the sound volume is proportional to the speed of the car. This kind of problem is generally related to four-wheel alignment or overload, if the wheel bearing is abnormal, if it is not in time, it will lead to the scrapping of the bearing (assembly), and even make the brake pads wear abnormally, which will affect the brake and driving system;

4. The driving half shaft "rattles", and the connectors of the car are prone to fatigue wear and impact in long-term work, and over time they will lose their original characteristics and make abnormal noises, and their sound sources are mostly "gurgle". Although the squeak of the half shaft has no direct impact on safety, it is also a safety hazard, and it is really annoying in the long run. The owner can drive the vehicle to a flat road, and then gradually increase the throttle, and carefully feel the shaking caused by the platform, and listen to whether the sound is abnormal, if the frequency of abnormal noise is very fast, most of it is a half-shaft problem.

The main reason for the abnormal noise in the chassis of the car is that the pressure bearing on the shock absorber is damaged, resulting in abnormal noise.

There are many problems of abnormal noise in the automobile chassis, and it is best to test the car in person to know that it is the best problem. Generally, it is the abnormal sound caused by the loosening of the ball head and the aging of the bushing.

This should not need to be solved by yourself, and it must not be solved, it must be tested by the 4S store, and the cause can only be treated symptomatically.

Finding the location of the abnormal noise is the premise of solving the problem. Just mention a chassis abnormal noise, no one can know how to solve it.

There is a creaking sound on the chassis of the car, and there are the following possibilities: 1. There is a problem with the rubber sleeve of the balance bar. The phenomenon is:

When the car passes over uneven roads, the chassis will rattle. The balance bar is also called the anti-roll bar and the stabilizer bar, and there are two buckles on the balance bar, and the buckle is the rubber sleeve of the balance bar. Cold in winter and hot in summer, coupled with the erosion of soil and dust, it will become harder and harder after aging.