how do you remove the drive belt pully & is there a bearing to the shaft that holds the drive belt pully?
the bearing on your tensioner is out of whack. check the alignment of your idler arm.
What IS 'drive belt pulley?" Bob is correct the tensioner is not keeping it tight, did you change it and put the wrong belt back on? Credit where credit is due, tenspeed learnt me count the grooves in one of the belt driven devices, then count the grooves on belt. Now,,, a serpentine runs on some thing on the back, or flat side
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