Anybody recognize this noise?

[brrian]

Listen to the video below. 3.8L V6 if it matters. In the front of the engine, there's a noise that I'd describe as 'shaking bearings in a glass jar'. It's most prominent at 0:05, 0:16, and 0:32 but can be heard throughout the video.

It comes and goes but it happens every time the engine runs. It sounds like it's the alternator but I'm not sure.

Does anybody recognize this?

 

[84 W40]

Just a guess, AC belt bouncing and hitting the alternator fan blades

 

[ELCAM]

Agree with 84 W40 tighten or remove the AC belt and I bet it stops.

 

[SS_Malibu]

It sounds like one of the pulleys to me.

 

[565bbchevy]

If the ac belt being too close is the issue I would suggest going with a longer alternator belt since you appear to be near lowest adjustment point currently, this will raise the alternator and give you more clearance

 

[brrian]

I bet you're all right about the belt hitting the fan. It's dark out now - I'll check it out tomorrow. Thanks!

 

[Built6spdMCSS]

Belt scrubbing the blades.

What's up with that hole? Should be a bolt there..

 

[69hurstolds]

Nothing a 307 V8 swap won't fix.

 

[84 W40]

Belt scrubbing the blades.

What's up with that hole? Should be a bolt there..

View attachment 216850

If you look closely the bolt is there

 

[Built6spdMCSS]

If you look closely the bolt is there

Is it a stud from the other side?