fj40 engine bay noise (1 Viewer)

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Is there anything between the fan and the bottom of the shroud?
 
It would be kind of labor intensive, but you could try removing one belt at a time and running it in order to see if you can isolate the issue???
 
I've seen where a short piece of hose can be used as a sort of stethoscope where one end is placed on the suspected part while the other end is held close to your ear. Maybe that would help narrow it down.
 
while driving today, this noise started. Any ideas? sounds like a pully. here is a link to a video of it.

New video by Kyle Pruitt - https://photos.app.goo.gl/6Cs4HMPUPPAWMU1s7



i think i have this diagnosed ......maybe

- one or both of your front or rear internal ALTERNATOR roller bearings is DYING a rapid panful death there in your tech video .....

- another TECH video of the passenger side focus your camera ALL OVER all 6 sides of the alternator , then REPORT BACK so we all can discuss our thoughts on all that NipponDenso JDM jazz .....
 
Yep, could be bearing chatter. Most every component has a bearing on each end. A long screwdriver to the ear to act like a stethoscope or possibly the hose would help narrow it down. Or as mentioned remove 1 belt at a time. It's hard to tell from a video it's location. Maybe a belt is too tight and causing failure.
 
it seems like the sounds is from the smog pump, we tightened the belt and its not as loud but sounds like its "sucking" air
 

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