HOW TO DIAGNOSE THE ABNORMAL SOUND OF THE CAR BELT

Rubber Brake Diaphragm is our main product, How to diagnose the abnormal sound of the car belt making different sounds? The car itself is a consumable product. It is inevitable that some problems will occur in daily frequent use. Among them, the abnormal noise of the car belt is believed to have been encountered by some car owners and friends. So what is the reason for this abnormal noise of the car belt? How to do it, let's take a look below.

　　Belt creaks

　　Generally speaking, it means that the friction coefficient of the belt surface is greatly reduced and it has been excessively worn.

　　If there is a noise when the vehicle is loaded, look at one of the drive belts, and you will find that the resistance or elastic force on the automatic belt tensioner or belt tensioner will increase abnormally.

　　Most automatic belt tensioners have a set of belt-wear length indicators somewhere between their base and the tensioner arm, along the direction of the slide. The symbol consists of a pointer and two or three markings, which indicate the working range of the belt tensioner. If the pointer is outside this range, the belt is probably stretched too long and should be replaced.

　　On a vehicle without an automatic belt tensioner, measure with a standard belt elongation gauge in the middle of the two pulleys. If there is a difference from the standard value, it is better to replace the belt.

　　Belt hissing, rattling, growling, or squeaking:

　　A continuous hissing or rattling sound that increases with increasing engine rpm usually means that the bearings of the auxiliary rotating mechanism are starved of oil.

　　With the help of a stethoscope, these noises can be further examined. Then remove the drive belt and turn the suspected faulty component by hand. If the rotation is difficult or the sound is rough and rattling, do not hesitate to replace the bearing or replace the corresponding part.

　　But it should be noted that every time you replace the parts of the auxiliary transmission accessories, you must not forget to replace the belt tensioner and the automatic tensioner.

　　If the engine speed increases, the continuous roaring sound gradually turns into a roaring sound, indicating that the corresponding bearing will soon fail.

　　The belt makes a long squeal or screeching noise:

　　Although the surface of the pulley is stained with dirt such as sand or the reverse installation of the used belt can also cause the belt to emit a long squeal or harsh noise, it is usually caused by improper assembly of the auxiliary device.

　　If the above noise occurs in a new car that has not been driven for a long time, it may be caused by the poor quality of the original factory equipment. Check for components that you think may be causing the failure. If the above noise occurs in an old car, then you should consider whether some accessories related to its auxiliary drive unit need to be completely replaced. Look carefully at accessories that may have been finely replaced to see if their mounting brackets are secure. It may also cause misalignment of the pulley.

　　As mentioned above, dirt or sand between the belt and pulley can also cause the above noise, so if the car is used in a relatively dirty environment, check whether there is dirt on the surface of all pulleys. Take the timing gear belt, which should be adjusted immediately after installation. This is why the direction of rotation of the timing gear belt is marked.

　　If the timing gear belt is removed and installed upside down due to other maintenance work, you will hear a sharp, piercing screeching sound when the belt is running. Try reversing the orientation of the belt and see if the fault goes away.

　　The belt rumbles

　　Rumble is a typical belt vibration sound, especially when the auxiliary mechanism transmission system is operating, when the engine reaches a certain speed, the noise will increase significantly. The cause of this type of failure is generally due to the transmission belt being too loose, stretched too long, or the belt tensioner and tensioner being damaged

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