What is the reason why the front wheel bump rattles?

Abnormal wheel noise: Abnormal wheel noise is likely to be caused by untimely maintenance of the vehicle, or often driving on bad roads, resulting in uneven wear of tires, and serious wear of tire bearings.

It is difficult for ordinary car owners to distinguish which are fault abnormal noises and which 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 are different; 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 impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise 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.

Damage to the plane shaft of the shock absorber or aging of the cushioning rubber of the front wheel shock absorber.

There is cushioned rubber at the place where the shock absorber is connected to the body, and the rubber products will age and harden after long-term use, and the rubber will make a gurgling sound when it is squeezed.

In this case, the problem can be solved by replacing the aging rubber on the shock absorber. In addition to this, there are two possibilities:

1. Swing arm ball head: The ball head of the lower swing arm is loose and the gap is too large, and there will be abnormal noise when the car is bumpy;

2. Aging of plastic parts: the rubber sleeve of the balance bar is loose and the gap is too large.

Damage to the plane shaft of the shock absorber or deterioration of the cushioning rubber of the front wheel shock absorber are the more common causes of the rattling of the front wheels.

There is cushioned rubber where the shock absorber is connected to the body, and the rubber products will age and harden after long-term use; When the rubber hardens and is squeezed, it makes a gurgling sound. In such a situation, the problem can be solved by simply replacing the aging rubber on the shock absorber.

Precautions for automotive shock absorbers.

The shock absorber is a vulnerable part in the process of car use, and the quality of the shock absorber will directly affect the smoothness of the car and the life of other parts.

The shock absorber will make a sound in the actual use of the fault, which is mainly due to the shock absorber and the leaf spring, frame or shaft collision, rubber pad damage or falling off, shock absorber dust cylinder deformation, insufficient oil and other reasons, should be found out the cause, to be repaired.

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During the driving of the car, the right front wheel will make a rattling sound as long as it is dialed a little, and in this case, there are generally the following aspects that are prone to problems. First, the shock absorber is damaged, it will have this kind of sound, and secondly, the chassis ball head includes the lower arm, the ball head direction machine pull rod, the ball head stabilizer rod, and the ball head will have problems. Next, consider the stabilizer bar sleeve.

Hanging rubber sleeves.

Swing arm ball joint: The lower swing arm ball head is loose and the gap is too large, and there will be abnormal noise when the car is bumpy.

Aging of plastic parts: the rubber sleeve of the balance bar is loose and the gap is too large.

Damaged shock absorbers can also cause the car to make abnormal noises when passing over uneven roads. Although the service life of the shock absorber is relatively long, it can also be regarded as a wearing part on the car; If the car environment is poor, or if you often drive violently, it is inevitable that there will be damage or oil leakage.

Precautions for the front wheels of the car.

During routine maintenance, frequent tire rotation helps to ensure uniform wear and tear of the tire, thereby extending the life of the tire. If signs of premature wear and irregular wear are found, the frequency of tire rotation can be appropriately increased, and the wheel alignment needs to be done after replacement, because the wheel alignment will keep the vehicle's suspension system and driving system in a standard state.

After the car is parked in the parking space, get out of the car to see if the front wheels of your car are still twisted to the side, it is best to let the two front wheels straighten, whether it is only for a while, or for many days, so that the front steering harness of your car is in a normal relaxed state; Otherwise, the change in beam angle will also exacerbate the irregular wear of the tire.

When the car passes through a bumpy road, the front wheels make an abnormal noise, which may be due to the following reasons:

1. The problem of the lower swing arm. Workaround: Replace.

2. The shock absorber assembly is broken. Workaround: Replace.

3. The steering ball head is broken. Check method: Kick the tire with your foot to see if there is any abnormal noise.

4. The rubber sleeve of the balance bar is broken. 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. It is cold in winter and hot in summer, and with the erosion of soil and dust, it will become harder and harder after aging.

As a result, when the vehicle passes over uneven road surfaces, the height of the left and right wheels is inconsistent, and a creaking sound will occur.

5. The problem of the engine guard, the sound caused by the friction between the engine guard plate and the chassis. It is also possible that the screws of the engine guard plate are loose.

6. The nut on the top of the shock absorber is loose. Open the bonnet, in the upper left and upper right corners, there are two hex nuts and see if they are loose.

There could be several reasons for this:

The reason for the stabilizer bar. Check whether the stabilizer bar rubber sleeve is aging, if the stabilizer bar is aging and hardening, there will be this sound.

The shock of the car is deformed, and the suspension may also be injured.

There is a problem with the shock absorber of the car and it needs to be repaired.

Extended information: Inspection of a car.

After the connection is tightened, Bel should check the height and quality of the fluid, because the fluid will gradually wear out and oxidize at high temperatures, resulting in a decrease in the liquid level and poor performance.

1. Check the liquid level height of the battery with a test tube with a diameter of 5 n 6mm, from the liquid filling port to the vertical force to contact with the filter screen, close the upper end of the test tube with your thumb, lift the tube, and measure the height of the liquid column is the liquid level height of the battery, and the standard should be 10 n 15mm.

2. Check the height of the lubricating oil level

Take out the oil dipstick when cooling the car, wipe it clean, insert it into the bottom of the oil pan, and observe that its height should be between the upper and lower reticles. When the car is hot, the engine should be turned off, and the oil should be measured after all the oil has flowed into the oil pan.

3. Check the height of the coolant level, the coolant in the water tank should be full when the car is cooled, and the height of the liquid level in the expansion tank should be between the marking lines. The liquid level height should be slightly higher than the superscript when the car is warmed.

4. Check the level of brake fluid and steering fluid

Unscrew the bolt and directly observe whether the liquid level is within the specified marking range.

5. Check the quality of the oil

Regardless of the type of oil, the following methods can be used to check it.

1) Appearance method: check the oil sample taken out, if it is relatively transparent, it indicates that the pollution is not serious; If it is foggy, there is water seeping into the oil; If it is gray, it may be contaminated with lead or other abrasives; If it is black, it is polluted by high-temperature exhaust gases.

2) Diffusion method: drop a drop of the oil sample on the filter paper, if the diffusion is very wide and there is no obvious difference between the oil droplet area and the diffusion area, it indicates that the cleanliness of the oil is good; Otherwise, the cleanliness of the oil deteriorates.

1. Check the tread of the front tire, if you find that the middle of the crown is worn rapidly, it is caused by high tire pressure. 2. Check the tread of the front tire, if you find that the shoulders of the crown are damaged too quickly, it is caused by insufficient tire pressure. 3. If you find that the outside or inside of the tire wears too fast, it means that the camber angle of the front wheel is abnormal.

4. Check the tread of the front tire, if you find that the crown of the tire is feather-like, it means that the front toe of the front tire is abnormal.

High tire pressure will increase the load per unit of ground contact area, which will accelerate the wear of the middle of the crown. In addition, the city fabric cord is subjected to excessive tensile stress, which can easily lead to early damage to the tire.

The lack of tire pressure will widen the grounding mark of the crown, and because the middle of the crown is slightly curved inward, it will cause the crown to look at the ground, causing the wear of the shoulders to accelerate, and at the same time, when driving at high speed, it will also cause the tread to crack.

If the outside of the crown is worn, the camber of the wheel is too large: If the inside of the crown is worn, the camber of the wheel is too small or there is a negative camber. At this point, a wheel aligner should be used to focus on checking the size of the wheel camber to confirm the diagnosis.

If the tip of the feathers on the crown of the left and right front wheels points to the longitudinal center of the car, it means that the toe-in is too large; If the tip of the feather is dorsally high to the longitudinal centerline of the car, it means that the front wheels of the car have a negative toe. At this time, the toe value of the front wheel should be checked and adjusted if necessary.

Check the tread of the front tire, if you find that there are polished spots on the tread of the tire, that is, bald spots, it means that the front wheel is unbalanced. When the front wheels are unbalanced, the vibration of the front wheels causes directional wear of the tires, which ultimately leads to shift wear. At this time, the wheel balancing machine should be used to focus on detecting the imbalance of the front wheel.

Photo by Pacific Automobile Network Q&A).

What happens to the abnormal noise when the front wheels of the car are bumpyWhen the car passes through the bumpy road, the front wheels have abnormal noise, which may be caused by the following reasons:1. Problems with the lower arm.

Solution: Replace. 2.

The shock absorber assembly is damaged. Solution: Replace.

3.The steering ball head is broken. Inspection Method:

Kick the tires with your feet to see if there is any abnormal noise. 4.The rubber sleeve of the balance bar is broken.

Equalizer bars are also called anti-roll bars and stabilizer bars. There are two clips on the balance bar. Inside the buckle is a rubber sleeve for the balance bar.

Cold in winter and hot in summer, coupled with the erosion of soil and dust, which liter will become harder and harder after aging. As a result, when the vehicle passes over uneven roads, the height of the left and right wheels is inconsistent, resulting in a creaking noise. 5.

Engine shroud problems, noise generated by the friction between the engine shroud and the chassis. The screws of the engine shroud may also be loose. Workaround:

Remove the engine guard. 6.The nut on the top of the shock absorber is loose.

Open the bonnet, in the upper left and upper right corners, there are two hex nuts and see if they are loose. Macro solution: tighten the hex nut to solve the problem.

Because you can't see the real car, you can't make an accurate judgment. It is recommended to go to a 4S shop or a professional auto repair shop and have a technician check it. Only by identifying the problem can we remedy it.

When the car passes through a bumpy road, there is an abnormal sound on the front wheels, which may be caused by the following reasons:1. Problems with the lower arm. Workaround: Replace.

2.The shock absorber assembly is damaged. Workaround: Replace.

3.The steering ball head is broken. Inspection method: Kick the tires with your feet to see if there is any abnormal noise.

4.The rubber sleeve of the balance bar is broken. Equalizer bars are also called anti-roll bars and stabilizer bars.

There are two clasps on the equalizer bar. Inside the buckle is a rubber sleeve for the balance bar. Cold in winter and hot in summer, coupled with soil and dust erosion, will become harder and harder as it ages.

As a result, when the vehicle passes over uneven roads, the height of the left and right wheels is inconsistent, resulting in a creaking noise.

5.Problems with the engine guards, noise from the friction between the engine guards and the chassis. It is also possible that the screws of the engine shroud are loose. Solution: Remove the engine guard.

6.The nut on the top of the shock absorber is loose. Open the engine cover, in the upper left and right corners, there are two hex nuts to see if they are loose. Solution: Tighten the hex nut to solve the problem.

Since you can't see the actual car, you can't make an accurate judgment. It is recommended to go to a 4S shop or a professional auto repair shop and ask a technician to check it. We can only remedy it if we determine what the problem is.