Because several belt-driven devices can make a similar noise, this one might take some time to diagnose. When that bearing goes bad, it can produce a whining/whirring or screeching noise. To route a serpentine belt, many cars use free-spinning pulleys like the one in the photo. The fix, in this case, was to replace the belt and worn-out alternator bolts to align the alternator.Ī failed bearing in one of the idler pulleys like this one is another common source of the noise.ħ. If you look closer in the photo, you can see rubber shavings in the area between the belt and the alternator. This caused the alternator pulley to be misaligned with the belt, so the belt was squealing and wearing out faster. Upon closer inspection, we found that the alternator was loose and shifted under angle. For example, in this car, in the photo, an alternator and a belt have been replaced while on a trip, a few weeks ago. Sometimes, you can visually see when one of the pulleys is not lined up. One of the symptoms of this problem is increased wear on one side of the belt. Often this problem is discovered after a newly replaced belt still squeals or wears out fast. If any of the belt-driven devices or a tensioner pulley for some reason is not lined up with the belt, the belt will squeal. A serpentine belt runs on several pulleys. This caused the belt to squeal and wear faster.Ħ. The alternator in this photo is not lined up with the belt and other pulleys. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.
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