Aygo rattling/knocking

[Mogarito]

Hi guys,

lately my Aygo has started making weird knocking/scratching noises. The car has 97.000 km on the clock, i've fitted a new waterpump+belt 6.000 km ago. As far as i can tell the noise originates from the alternator/ac-area. The weirdest thing is that the sound is definitly getting louder as the engine warms up, the video i linked was recorded after a 25km crosscountry/autobahn drive. The noise is mainly audible at idle and low speeds, though i am not shure if that is actually due to the noise quieting down or wind and tire noises drowning it out. I linked a video with a recording of the noise. Do you guys have any ideas what the sound could be? Broken alternator bearing? Rod knock? Cat Rattle? 

Thanks in advance, here's the vid

https://www.youtube.com/watch?v=pJFLvN45QKA

[Billyboy81]

Sounds like the timing chain is slapping against its cover. Not saying it is but it sounds like it.

[SimonIG10]

Take the alternator belt off and see if the noise goes away. Plus you can spin the waterpump and alternator to see what the bearings are like.