The solution to the noise problem of second-hand car

Body noise

It is caused by normal perennial use, mostly due to the relaxation of certain parts. At the same time, noise is related to driving speed. This is a problem of resonance.Other noises not listed above should be paid attention to and eliminated in time, such assteering systemNoise (affecting safety), noise from electrical appliances, etc.

brakeSystem noise

Brake padsIf it continues to be used after normal wear and tear,Brake shoeEasy to grindBrake disc(That is, the phenomenon of iron hitting the iron), there will be very harsh screams when braking. The solution is to replace the brake pads (the brake discs should also be replaced if they are worn.

exhaust pipenoise

It belongs to the category of normal aging. Exhaust pipes of about 10 years or 200,000 kilometers, because the bottom of the car body is often exposed to acid-base mixtures such as muddy water, etc., or there is the possibility of air leakage due to corrosion, which increases the noise at the rear of the car body. This is generally obvious. come out. The solution is to replace the whole or part of the exhaust pipe, and the noise can be eliminated immediately.

Engine and accessories noise

This is due to the normal wear and tear of the internal components of the engine due to age.If there has been an abnormal accident before, for example, the oil has leaked and the oil has not been detected in time or has leaked.antifreezeWait. The noise of the engine that has experienced this will be greater, and the magnitude of the noise will vary depending on the magnitude of the accident. The solution is to replace some or all of the engine moving parts, such as connecting rods, connecting rod bushes,pistonandPiston ring.There are also accessories such as those outside the enginebeltThe installation is incorrect or caused by long-term wear and tear.

Suspension system noise

Although this belongs to the category of normal aging, different users will have significantly different results.A large part isWheel hubBearing wear orShock absorberDue to the decrease in the damping capacity of the shock absorber fluid. There are also many examples of light leakage from shock absorber fluid. Because the damping performance of the car is achieved by the damping fluid and the spring, the loss of the damping fluid's ability will significantly increase the noise. The solution is to go to the car dealer to repair, change the wheel bearing or shock absorber, etc. (Dahe Net)