Causes of Abnormal Noise of Belt Tensioner When BMW 5 Series Starts

The abnormal sound of the tensioner belt of the vehicle may generally be caused by dryness between the tensioner and the fixed point, or a problem with the belt. The tensioner went bad and the car made a screeching metallic sound when accelerating. The function of the tensioner is to guide and tighten the timing belt or timing chain of the engine so that it is always in the best tension state.

The abnormal sound of the tensioner belt of the vehicle may generally be caused by dryness between the tensioner and the fixed point, or a problem with the belt.

The tensioner went bad and the car made a screeching metallic sound when accelerating. The function of the tensioner is to guide and tighten the timing belt or timing chain of the engine so that it is always in the best tension state. The tensioner is a part of the tensioner, which is in direct contact with the timing belt/chain, and is used to keep the belt/chain with proper tension during the transmission process, and to avoid the belt from slipping, jumping teeth or loosening and falling off. Phenomenon, can reduce sprocket, chain wear.

There is a bearing inside the tensioner. If there is abnormal noise, it indicates that the bearing of the tensioner is damaged, and the engine may have timing jumps, ignition and gas distribution timing disorder, which will affect the normal use of the car. If it is not replaced in time, it may cause engine vibration, difficulty in ignition, and in severe cases, the car may not be able to start. It may also deform the valve top, cause damage to engine components, and may even lock up, causing the belt to not drive normally and causing the car to break down.