What is the reason for the car squeaking?

Pacific Auto Network should first check whether putting some plastic products when the car is driving will cause * * * vibration, or check whether the knob of the outer door lock of the right front and rear doors is loose, which will also cause * * * vibration when the car is driving. Because sometimes it is such a small problem that we are not easy to detect. If everything is checked and there is no problem, please go to 4S and ask someone to check the right front and rear shock absorption, chassis screws, whether there are screws loose on the door panel, and whether the inner door panel is buckled and damaged.

Reasons for abnormal sound of belt: Abnormal sound of belt generally means that the friction coefficient of belt surface is greatly reduced and has been excessively worn. If there is noise when the vehicle is loaded, you may wish to observe a group of transmission belts, and you will find that the resistance or elasticity on the automatic belt tensioner or belt tensioner will increase abnormally.

Most automatic belt tensioners have a set of belt wear length indicators somewhere in the sliding direction between the bottom and the tensioner arm. This sign consists of a pointer and two or three marks, indicating the working range of the belt tensioner. If the pointer exceeds this range, the belt may be stretched too long and should be replaced. On vehicles without automatic belt tensioner, measure between two pulleys with a standard belt elongation measuring ruler. If it is different from the standard value, it is best to replace the belt.

The reason why belts squeak: What belts do cars have? The generator belt is the most important belt on the vehicle, which connects the generator, air conditioning compressor, booster pump, idler pulley, tensioner and crankshaft pulley. Its power source is crankshaft pulley, which provides power through the rotation of crankshaft, and then drives other components to run together. When tiny cracks appear on the contact surface between the belt and pulley, it needs to be replaced. If it is broken, the generator will be unable to generate electricity, the booster pump will fail and the direction will not move. This is a very dangerous situation.

The timing belt connects the cam and camshaft. The crankshaft is connected with the piston, and the piston moves up and down when the crankshaft rotates; The cam is connected with the throttle and controls the opening and closing of the throttle. The piston and throttle need to work together. When the piston sucks in air, the throttle valve opens. When exhausting, the throttle valve is closed.

If the timing belt breaks, it will cause problems in the cooperation between the piston and the throttle valve, or even cause the piston to break the throttle valve and damage the piston, then the engine will be overhauled. Therefore, it is best to replace the timing belt regularly according to the service life in the maintenance manual.

At present, the synchronous belts of many cars should be chained. The advantage is long service life, and it won't break after entering. According to the national standard, the generator belt and belt accessories need to be replaced after the general vehicle travels 60,000 kilometers or two years, which is by no means until it is worn out, because once the belt breaks, it will directly affect the driving safety.