That is caused by a pulley that is tipped or turned. The pulleys you already replaced are the most common causes since they have bearings that can become sloppy. If you only replaced the pulley on the spring-loaded tensioner, but not the arm itself, that is the likely cause now. The arm becomes worn around the pivot, and that lets it sit at an angle. Also check for free movement in that arm. For the benefit of anyone else researching this topic, I have to add, . . . please do this with the engine not running. Tug on the belt and release it. Observe if the tensioner pulley moves back and forth freely. If it doesn't, it won't hold proper tension on the belt.
This is usually not caused by pulleys that have ribs on them, such as for the alternator. If one of those items is turned a little, it will usually set up a horrendous belt squeal.
Be aware too that tipped pulleys will cause the belt to walk off-center but not necessarily squeal. It's when a pulley is turned a little that the belt has to slide across it as it goes around it. That's what makes it squeal.
Take a look at this article too:
https://www.2carpros.com/articles/car-squeaking-noise
It might give you more ideas on what to look for.
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Monday, January 27th, 2020 AT 2:53 PM
