Does anyone know what this noise could be?

[blue62]

Originally Posted by Homeoboxter

To me it sounds quite like this:
https://www.youtube.com/watch?v=YK2ihM9-JaQ&t=4s

But seriously, you don`t even need to pull the belt, you can just loosen it up by releasing the tensioner roller for a couple seconds while idling using a breaker bar. Everything that the belt drives will stop and that will narrow down the potential causes, as Blue suggested.

Great video
I think it hits some of the sounds