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Discussion Starter #1
A couple of days ago, I started to hear a noise from the engine bay.

I've tried to pinpoint the noise with a stethoscope. It sounds like it's coming from the passenger side valve cover. I plan to start tearing into it tomorrow morning.

I took a quick video, perhaps someone has run into this type of noise.

Any assistance would be greatly appreciated.

 

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That's the exact noise my alt was making right before it seized up.. Like the guy before me said. Remove belt and see if the sound goes away
 

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I'd bet on idler pulley or one of the accessories. Only say that because had a similar noise on my F150HD, only lasted a few days before I heard a "clunk, ting ting ting", and got home to discover I was short a blower belt idler pulley.
 
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