The sound of good vehicle should not cause discomfort. Any unpleasant noises indicate that some node or unit function incorrectly. React to signs must be immediately, otherwise the principle enters into force "one breakdown entails another".

What does the sound say

Various extraneous sounds and noises in the car are alarm signal and are a reason to pay attention to the technical condition of the vehicle. The knock is the backlash that appeared in some node. Often it appears from the natural wear of this node. The noise is formed from rubbing elements. Noise and knocks are very similar. In addition, they are often summarized. For example, there is a backlash in the steering tips or bearings of the front hubs and the ball supports are faulty. How to determine exactly, from which node this knock and noise take place?

We determine the place of noise or knock

To set the place of noise or knock, you first need to know from which side this noise / knock is: rear or front, right or left. If you have already identified an approximate place of noise, it will be much easier to find it. Observations will also help: under what conditions the sound occurs and with which it is synchronized.

Rear suspension

Rear brake drums and pads.After clicking on the brake pedal, noise is heard or the body vibration appears? This is a fairly frequent malfunction, which is characteristic of raw weather. As a rule, this is due to a thin layer of corrosion or dirt on the brake pads or the inner surface of the drums. In this case, try to drive 100 meters on a slightly elongated handbrake - due to friction, the corrosion layer will disappear.

Rear axle thrust.During braking and starting from a place on rear-wheel drive cars, a knock is not rarely heard as a result of wear of the sleeves. Either after the rapid pressing on the gas pedal, the back of the car pulls to the side. At the same time, the direction of the vehicle movement has to be corrected. In this case, it is necessary to replace faulty traction.

Noise from gearbox

Noise in the area of \u200b\u200bthe box with a h-engine operating engine, most likely comes from the bearing of the primary gearbox, intermediate or gear. This is a sign that the PPC needs to be dismantled and sorting out. This needs to be done within a month, otherwise the car simply will be in the middle of the road and the evacuator will be required.

And if the grinding or noise occurs while clicking on the clutch pedal, and end when you let it go, this is a sign of "death" of the release bearing. It should be replaced for 2-3 weeks, otherwise it will crush and it will be impossible to switch the transmissions. Another specific sound is whistling - speaks of the bearing dug from its foundation. In this case, you can ride, but the sound will be annoyed. For six months, it is necessary to call for a hundred.

Front car suspension

Half If the buzz increases with increasing speed, then they are faulty. The semi-axes do not break, but it has a weak place - bearing. Within 3 weeks, it is necessary to redate it or to replace it with the half-axis.

Sls.If the shoes (grenades) are faulty, clicks will clearly, click. Especially if at idle turns to twist the wheel from the side to the side. In this case, urgent replacement is required.

Ball supports.In case of malfunction, they creak or knock when driving on an uneven road and bumps. It is necessary to replace them as quickly as possible, otherwise the car will stand in the middle of the road, while the wheel will be unnaturally turned out.

Hub bearings.The front hub bearings can publish both a knock and noise. The noise occurs as a result of wear of the bearing rollers and the treadmill of separators, and the knock - from a strong backlash in bearings. It is not difficult to diagnose yourself. To do this, you need to raise the left side of the car and sharply rotate the wheel. If there is a buzz, similar to the noise of a bowl of metal, which rolls on a metal sheet, it is necessary to replace the bearing. Next, lie with your left hand for the upper inner section of the wheel, and with the right hand - for the lower external. Now you need to shake the wheel "on the break." If it is even slightly "dangling", refer to the specialists to eliminate the backup in the hub bearing, otherwise its service life is twice.

Steering.It should be started with a gearbox, which sometimes knocks as a result of the wear of the main pair and creaks during the rotation of the steering wheel in various sides. As a rule, the problem is solved by lubricating and adjusting the steering shaft. And the steering tips and thrust are knocking like ball supports, and the knock is manifested only on an uneven road. It is necessary to urgently change them.

Shock absorbers.As a rule, they do not annoy the "sounds", however, if the sounds are still present, they are well heard on the uneven road: they are sorry and knock. Their disease is wear of pillows, rubber bushings, leakage of oil. You need to shake the car (click on the trunk and wings) and listen, whether there are knocks. If the body continues to sway even after the exposure you stop, then the bushings and pillows are worn. It is dangerous on such shock absorbers, because during a sharp pressing on the brake paths the braking path is doubled. In addition, the cause of the breakdown can be leaking oils from the shock absorber, which is noticeably naked eye (you will see the housing and implications on the body). Such a shock absorber needs to be replaced.

Springs.The unpleasant sounds of rubbing metal elements are quite often emitting springs. The reason is in the wrong installation - to resolve the problem, you should contact the masters that were installed.

Brakes.The brake pads are sometimes rewinding under the conditions of influence on the pedal, right up to the crossed. If the pads are likely, they just have not been laughed, and the noise will disappear after 1-2 thousand kilometers in itself. However, there is a risk that they are curves, that is, defective. Therefore, if the sound did not disappear after a while, and the car changes the trajectory when braking (it is right or left), the pads should be replaced. On cars, expensive in service, they cost quite expensive, so the problem can be solved differently: remove the brake disc and diligence on the machine, and the brake pads are treated with a sharpening circle.

Faults in the motor compartment

Generator belt.The breakdown can be determined by shrill visa after the engine is launched or with a sharp increase in revolutions. To stop it, you need to pull the belt. If it did not help either the sound returned after a certain time, change it to the new one.

Water pump.If a thin whistle and / or rokot is heard on the XX from the front of the motor compartment, then the pump is defective. In this case, you need to replace it.

Ignition.A ringing metal knock when overclocking the vehicle indicates detonation (that is, the fuel mixture explosion in the combustion chamber). Most likely, the ignition is too early, you poured low-quality fuel or a large amount of Nagara appeared in the combustion chamber. In addition, the cause of detonation can be overheating of the motor or old candles. The above sound is published by the pistons of the motor, which take over the blows from the bundle of a combustible mixture. Long-term movement with such a sound entails the destruction of the engine.

Timing.Timing noise against the background of the overall functioning of the motor liste very well. If the chain is weakly stretched, it makes a shocking-clapping sound, amplifying with an increase in the rotor of the motor and disappearing when resetting the gas. But if the timing belt is installed on the car, not a chain, there will be no alarming sounds before opening. It must be simply changed every 60-100 thousand km, depending on the manufacturer's recommendations.

Bearings, pistons and valves.There are several ways to check the quality of overhaul, without disassembled the motor. To do this, just listen to the engine. Thus, the native crankshaft bearings with a malfunction make a deaf metallic sound with a sharp press on the gas pedal on the XX. The frequency of the knock rises with increasing the rotation frequency of the crankshaft. A sharper sound with uneven intervals is caused by an excessive axial clearance clearance. Even more sharp noises are published by connecting rod bearings. When only one of the sheek is faulty, the location of the knock can be determined, turning off the spark plugs in turn. The muffled knock make piston curves. A knock of graduation or intake valves, which is heard with uniform intervals - most likely, the signal that the valve adjustment is needed, or the wear of the valve mechanism is increased, or is broken one of the components of this mechanism. If the knock is enhanced when the motor is gaining momentum, most likely, the cause in increased valve gaps.

Car exhaust system

If the exhaust system is faulty, the sound is unrealistic to confuse with any other: first the muffler roars, then the sound of a pistol shot, which, if you ignore it, will turn into a machine line. In this case, the sooner you refer to the specialists to eliminate the Reserve, the cheaper it will be repaired.

By the way, during the diagnostics of the muffler, attention should be paid to the liquid output from the exhaust pipe. When it drips some water and the liquid is not fat (to the touch), it's just condensate. If it is fat or has a "chemical" smell and color (oils, gasoline), it is necessary to turn to the service station - it may indicate both the fine-dimensional (for example, the oil-challenges of valve caps are guilty) and on a serious breakdown when the rings in the cylinders Water falls into the crankcase, after which it mixes with butter. As a result, the role of motor oil in the lubrication system performs a water-oil mixture, which is not able to properly perform a lubricatory function. Such a problem requires immediate elimination, otherwise the engine awaits expensive overhaul.