As a result, the belt can come loose and knock against other components, causing a slapping-like noise. ![]() When pulleys wear out, they often struggle to maintain tension on the belt. Speaking of warning noises, another common sign of a bad timing belt pulley is a knocking or slapping sound coming from your machine. ![]() A squeal, on the other hand, is a chirp that gets louder and increases in volume along with engine speed. Noises that indicate your drive belt may be misaligned As the speed of the serpentine belt or drive belt increases, it will probably become nearly inaudible. What does a misaligned serpentine belt sound like? Symptoms of a bad tensioner pulley include difficulty starting the car, loud grinding or screeching noises, a loose engine belt, and a lack of power when trying to speed up the vehicle. What happens if my tensioner pulley goes bad? This happens over the years due to friction, leading to cracks in the belt. You’ll also hear the chirping noise if the pulley grooves are damaged. If any tensioner pulley begins to wear out with time, it’ll create more of a chirping noise. How do I know if my belt tensioner is bad?Ĭommon signs include grinding or squeaking noises coming from the belt, unusual belt wear, and belt-driven accessories like the alternator failing. It’s also common for a worn out pulley or idler tension pulley to cause a clicking sound as the belt spins. In most cases, this type of clicking sound is caused by a belt that is slightly frayed and hitting a shield or other mechanical component. If they are ok, proceed to dig deeper to troubleshoot the timing belt tensioner.24 Can CV joint cause knocking? Why is my serpentine belt making a knocking noise? Also, if they are failing, they generally do not cause stumbling or hard starting. So if you have doubts about where the noise is coming from, take steps to rule them out first. They are both relatively easy to inspect, and simple and inexpensive to replace. Both of these can also make the same noises as a timing belt tensioner. Keep in mind that the serpentine belt also has a tensioner, and also sometimes and idler pulley. When the engine is idling, listen for the following noises from the timing cover area: For example, the pulley may not be rotating freely. Or you may hear timing belt tensioner noise. When the timing belt isn’t tight enough, it starts making noise. Even if you manage to start the engine, expect the engine to misfire or run rough. This leads to hard starting It may take a while for the engine to fire up properly. When there are timing belt tensioner issues, the valve timing is slightly off. Lack of perfect timing leads to acceleration issues. Look for the following signs of timing belt tensioner failure: Acceleration Issues The crankshaft and camshaft will come out of perfect time for a moment or two. Instead, when the throttle is abruptly opened the tensioner can’t keep the right tension on the timing belt. One thing to keep in mind is that when the tensioner begins to fail, the timing belt, which has teeth, doesn’t actually slip. There are several different ways to detect timing belt tensioner failure simply by driving the vehicle. If the timing belt tensioner is leaking, it will lose the tension it needs to keep the timing belt tight. It uses hydraulic oil to maintain the tension. Hydraulic oil leak: A hydraulic timing belt tensioner assembly works like a small shock absorber.It may cause the timing belt to slip off. Dirt and dust build-up on the timing belt tensioner pulley: When this happens, the pulley will fail to support the timing belt.As a result, the entire tensioner becomes too weak. Over time, the spring stretches out and loses its tension. Wear and tear: On a new mechanical timing belt tensioner system, the timing belt tensioner spring is wound tightly by two tension rods. ![]() The most common causes of timing belt tensioner failure include: So if any suspicion arises that the timing belt tensioner has failed, it’s important to check the tensioner and replace it if necessary. As a result, the timing belt becomes loose and the valve timing can be thrown off. When a timing belt tensioner fails, it loses tension. Usually, the tensioner is replaced along with the timing belt. Some timing belt tensioners last a long time.
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