Hello,
There is a spaced that goes behind the idler pulley as it gets mounted to the bracket.
You should be able to reuse the spacer when you took off the old pulley.
Without it the pulley will not align properly, and the bell can come off
https://www.2carpros.com/articles/how-a-serpentine-belt-works
I have attached a diagram for your reference.
Please let me know if you have any questions.
Thank you.
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Monday, November 8th, 2021 AT 9:28 AM