The appearance of extraneous sounds in the chassis of the car is always a signal that the mechanical system is not working properly. It is becoming particularly disturbing. grazing, since it often indicates critical wear of the nodes responsible for the transmission of torque. Unlike a thud, which may indicate backlashes in Silentblocks, it is the grinding sound that is most often associated with the friction of metal against metal without proper lubrication or with the destruction of transmission components.
Ignoring this symptom can lead to a complete wheel lock in motion, creating an emergency situation on the road. The driver must clearly understand the difference between the sounds that occur when turning the steering wheel in the parking lot and the noise that appears in movement under load. The nature of the sound, its frequency and dependence on the angle of rotation of the wheels help to accurately determine the faulty node, whether it is an external one. Ε RUS, mortar bearing or braking system components.
In this article, we will discuss in detail the main causes of grinding when turning to the right, since the direction of movement plays a key role in the diagnosis. You will learn why the right turn loads the left drive and vice versa, how to distinguish the grenade from the bearing and what measures to take immediately to avoid expensive repairs.
Diagnosis of malfunctions of SRUS: why crunch is on the right
The most likely cause of the appearance of a characteristic crunch or grinding when turning to the right is a malfunction of the left outer hinge of equal angular speeds (SRUS). Many drivers mistakenly believe that the sound on the right comes from the right part, but the physics of the suspension dictates different rules. When turning the wheels to the right, the left wheel is hung out and it has the maximum load on the transmission of torque, because of which the worn-out left wheel is used. slug-out It's starting to make sounds.
The design of the hinge assumes the presence of a separator and balls that move along the grooves. When protective duster It breaks, the lubricant leaks out, and dirt and water get inside. Abrasive particles destroy working surfaces, forming a production. As a result, when working at an angle, the balls begin to slip and hit the edge of the grooves, creating the same ringing grind.
β οΈ Attention: Operation of the car with a crispy SRUS is permissible only in emergency mode to the nearest service. Further driving can lead to a jamming of the hinge and a break of the semi-axis, which will make movement impossible.
For the initial check, you can turn the steering wheel to the right and slowly move from place. If there is a distinct crackling or grinding that stops when the steering wheel is straightened, the diagnosis is almost certainly confirmed. It is also worth visually inspecting the anthers for cracks or lubrication traces around them.
Stage bearings: how to distinguish noise from crunch
The second most common cause of extraneous sounds is wear of the hub bearing. Unlike the SRUS, which crunches when loaded and turned, hub-bearer It usually hums or howls, and that sound builds up with increasing speed. However, in the initial stages of destruction or with a strong backlash, it can emit metal grinding, especially if the separator or rollers themselves have collapsed.
When turning right, the load on the right side of the car increases, and if the right bearing is defective, the sound may increase. But there is also the opposite situation: when the body rolls to the other side, the damaged element can make sounds due to a change in the geometry of the adjoining parts. It is important to listen to whether the tone of the sound changes when the steering wheel is swaying from side to side on the go.
Diagnosis can be carried out by domkratsya car and swaying the wheel in vertical and horizontal planes. The presence of a backlash is a sure sign that hub It needs a replacement. It is also worth spinning the wheel with your hand: a serviceable bearing rotates silently, while a damaged one will emit a crunch or rolling.
Use a long mounting shovel or stethoscope to listen to the hub on the engine running. Apply the tool to the swivel fist next to the bearing β it is easier to localize the noise source, eliminating the sounds of the engine.
Brake system: wear of pads and discs
If the grinding is heard not only when driving, but also when lightly touching the brake pedal during a turn, the problem may lie in the brake mechanisms. Critical wear and tear brake-pad This causes the metal base to press against the disc, causing a piercing grind. When turning to the right due to inertia and body roll, the load on the external wheels changes, which can provoke contact of worn parts.
Another reason is the hit of a stone between the brake disc and the protective shield (shield). With a straight movement, the stone may not touch the surface, but when you turn the caliper or disc shifts, and the grinding begins. This often happens after driving on gravel roads or after washing under pressure.
It is necessary to remove the wheel and conduct a visual inspection of the brake disc. The presence of deep furrows or bullies indicates that the pads are completely erased. In this case, replacement is required not only for consumables, but also for the disks themselves, since their geometry has already been broken.
βοΈ Brake system diagnostics
Steering and suspension
Less often, the cause of grinding is malfunctions in the very steering-rail Or thrust tips. If you can hear grinding when turning the steering wheel on the spot or in motion, it is worth checking the anthers of the rack and the presence of lubrication. Dry gears or the ingress of sand into the rack mechanism can give a metallic sound when moving the toothed pair.
It is also worth paying attention to the ball supports. Although their wear is more often manifested by knocking, in some suspension designs, with a strong backlash and shifting the center of gravity (when turning), friction of metal parts can occur. This is especially true for cars with a mileage, where the resource is running-piece It's coming to an end.
Stabilizer pulls are another element that can make sounds. If the hinge is "broken", when the body is rolled in a turn, it can click or grind. You can check them by shaking the stabilizer rack with your hand when the car is raised - the backlash will be felt immediately.
β οΈ Attention: Do not confuse the grinding of the steering rack with the work of the GUR pump. If the sound is more like a howl and only appears when the steering wheel is rotating, check the fluid level in the tank of the power.
Comparative table of symptoms
To systematize the knowledge gained and quickly identify the malfunction, use the following table. It will help to compare the nature of the sound and the conditions of its occurrence with the likely breakdown.
| Malfunction | Nature of sound | When it comes to | Additional sign |
|---|---|---|---|
| Outside SRUSS | Ring crunch, crackling. | Turning and accelerating | Semi-axis vibration |
| Stack bearing | The sound that turns into a scroll | Constantly, increasing at speed. | Hub heating |
| Brake pads | Metal squeal, grinding | When you apply the brake | Black dust on the discs |
| The stones are in the brakes | A sharp, intermittent gnash | Constantly, regardless of braking | Passes after washing or cleaning |
Accurate diagnosis is impossible without lifting the car and checking the nodes for backlash. Sound is only a primary indicator that requires visual confirmation.
Elimination methods and repair costs
Elimination of the grinding depends directly on the identified cause. If the problem is Ε RUCEMost often, the entire drive assembly or the hinge itself (garnet) with the replacement of the anther and lubricant are changed. The cost of work varies depending on the model of the car, but you can not delay the repair, since the break of the drive on the go is a loss of control.
Replacing a hub bearing requires the use of a press or a special mandrel, since pressing "on the knee" is unacceptable. It is also important to replace the hub or nut itself if they are disposable structural elements. After replacement, there is a break-down.
In the case of brakes, replacing pads and discs is a standard procedure. However, if the grinding is caused by deformation of the protective shield, it can be gently bent away. The main thing is not to leave the system unattended, since a damaged disk can burst under load.
Can I drive with a crispy SRUS?
Theoretically, the car will drive until the hinge jams or collapses completely. However, it is impossible to predict the moment of failure. It can happen in 100 km or 1000 km. The risk of remaining on the sidelines or in the flow is very high, so delaying with replacement is life-threatening.
Prevention and maintenance advice
To avoid the reappearance of the grinding and prolong the life of the transmission nodes, it is necessary to regularly inspect the state of the anthers of the SRUS. The slightest crack on rubber It should be a reason to replace, as repair will cost less than replacing the entire drive or hub.
It is also important to avoid sharp starts with wheels turned out, especially on front-wheel drive cars. This puts extreme stress on the hinges. Car washing should be carried out carefully: you should not direct a powerful stream of water under high pressure directly to the anthers and brake mechanisms, so as not to wash the lubricant.
Regular maintenance of the chassis, including checking the backlashes and lubrication condition, will allow to identify the problem at an early stage. Remember that a grinding is a βcry for helpβ of your car, ignoring which leads to serious financial losses.
When buying new anthers, choose products made of thermoplastic rubber, not from ordinary. They last 2-3 times longer and better tolerate temperature changes and aggressive environment.
Why does it only hold when you turn right and not left?
This is due to the distribution of the load. When turning to the right, the left wheel (external) experiences the maximum compression and torsion load. If the left outer SRUS is faulty, it will crunch at this point. When turning to the left, the load is shifted to the right side, and the left hinge works in a more gentle mode.
Is it dangerous to drive if you hear the grinding in the brakes?
Yes, it's extremely dangerous. Metal grinding means that braking efficiency has dropped to almost zero on this wheel. In addition, the disc may overheat and deform or burst, which will lead to a jamming of the wheel.
Can it be because of the low level of oil in the box?
By itself, the low level of oil in the manual transmission or automatic transmission rarely causes grinding when turning. However, if the oil does not flow to the differential or bearings of the shafts, they may begin to break down, which will eventually give metal noise. But the primary symptom will usually be a hum or howl.
How long can you travel with a crisp grenade?
The timing is unpredictable. Some SRUS live with a crunch for months, others fall apart after a couple of days of active driving. It depends on the degree of production and quality of the metal. You should not risk it - a break in the semi-axis often occurs at the time of a sharp acceleration.