SOURCE: altenator belt breaking
Is this a single serpentine belt system or a V belt with 2 or more belts running the accessories? There is an alignment issue, another bad accessorie or bad bearing (quite possibley the new alt) or as mentioned a bad idler ( if a serpentine belt setup)
SOURCE: Changing Serpentine Belt on '01 Impala LS (3.8L)
Can u turn the nut in the opposite direction that u have been trying? U need a lot of leverage to get enough tension off to remove the belt. If u have enough room, add a pipe to the end of your wrench, u will need a lot of room to move the tensioner enough. U might have better luck buying the wrench made for that purpose at a parts store. I think I paid about 25 a couple years ago, I couldn't fit a regular socket and wrench on the tensioner, it was a very tight space.
SOURCE: tension pully is loose making the belt rattle
It sounds like you have a broken serpentine belt tensioner. The tensioner should always be tight, it is spring loaded and you would have had to release the tension on it to have put the new belt on.Depending on what engine that is in yours, this could be an easy fix or a hard fix. The tensioner on a 2.2L is made into a large plate bracket that is attached to the front on the engine and several other items have to come off to replace it.The tensioner on the 3.1L v6 is smaller and has one bolt that holds it on.Either one is available at the local auto parts store.
Hope this helps
SOURCE: how do I release the belt tension pully to replace serpentine belt
You can run down to your local auto parts store and buy a serp belt tool. Or you can take a 3/8 drive ratchet, locate the 3/8 square hole in your tensioner and put the ratchet in the hole. For more leverage I put a deep socket over the ratchet handle and put a long 3/8 extention in the deep socket. This will provide ample leverage and will save buying more tools you do not need. Simply move the tensioner to the direction that takes pressure off of the belt.
SOURCE: Serpentine belts keeps shredding
would help if i knew what car it was ,main cause of this problem is one of the plastic wheel/tensioner is faulty if you look carefully then you will that it should have a guide like a train wheel with a falnge on either side and one or both of these flanges have broken away so the without the guide the belt runs on the edge of the wheel and it shreds .not the first time i have seen this
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