It is never enjoyable to hear a noise from your car you don’t know where from. Then what if you discover a serpentine belt noise that stays on your BMW 4 Series? It is extremely possible that this is a minimal trouble, but before being sure, it is better to accomplish some checks. If this belt noise comes from your serpentine or driving belt, our team has written an article to support you finding and correcting it. First, we will look at the serpentine belt noises on your BMW 4 Series and then we will look at the sources of these noises.
I experience noises from serpentine belt BMW 4 Series
The best technique to check the state of your belts is to listen to your car. Immediately after you recognise noises such as squealing or bells, you should take a closer look to examine their source. The function of the serpentine belt or driving belt of your BMW 4 Series is to transfer the movement of the engine to the secondary components that it will supply with energy. Like steering, air conditioning, water pump. Its role is therefore important in the normal functionality of your car. The serpentine belt is said to be asynchronous, i.e. unlike the timing belt, it has the ability to drive distinctive engine components at variable speeds.
I hear squealing noises on my serpentine belt BMW 4 Series
This kind of squealing belt noises on BMW 4 Series, which will often be acute, can generally occur when the engine is cold, or when the acceleration increases in intensity. . This kind of noise must be heavy and it is normally quite simple to relate it with one of these belts. To examine, do not hesitate to open your bonnet, engine running cold and check the source of this noise, the serpentine or driving belt being exposed, it should not be too difficult for you to point a belt noise on your BMW 4 Series. The reason of this trouble can be related to the damper pulley, which functions as a damper to eradicate irregularities in the tension in the motor cycle and therefore in the energy transmission to the belt. This results in a loose belt that will jerk. However, you still have a chance that this phenomenon is annodine. As the serpentine belt of your BMW 4 Series is exposed, it may squeak due to excessive humidity due to weather conditions and it may end with a change in conditions. Remember to examine the state of your belt (crack, crack), if this is the case replace it, otherwise simply tighten the belt.
I hear loud serpentine or driving belt noises BMW 4 Series
Just like squealing, a driving belt noise on your BMW 4 Series that sounds like a loud grinding sound can reveal a lot about its state. It is therefore important that you look further and find the cause for this sound that can signal the end of your belt’s life. Like squealing noise, it can be identified in most cases when cold . It generally means a worn pulley whose streaks no longer allow it to be driven correctly. Other alternatives, the dynamic belt tensioner or the disengageable pulley of the alternator may be at the source of this trouble. Remember to examine first the serpentine/driving belt which in most cases is the reason of this trouble, otherwise it will be necessary to replace the tensioner or pulley.
I hear bearing noises on the serpentine belt of my BMW 4 Series
Finally, if in your case you recognize a bearing belt noise on BMW 4 Series, it is possible that it is related to a serpentine belt that is too tight . Indeed, it is possible that its size may be smaller than recommended and cause the entire system to overvoltage, resulting in this whistling noise or slight rolling noise. The risk in this case is that the bearing bearings or the Damper pulley may fail . Remember, therefore, to stretch the belt to limit the risks or to swap it if it is too short. If after checking all thoses alternatives, you still detect a belt noises, read our article about timing belt noises on BMW 4 Series which could maybe help you.
