17 Expedition XLT engine rattling noise

[Mooncaller]

Hello!
So I have an 2017 Expedition XLT and I’ve just broke the 109000 mile mark.
It started having an engine rattle.
Like when I turn it on cold there’s like a screeching sound and it kinda feels like it’s metal on metal rubbing. I live in Vegas so it’s not really that cold here.
So back to the rattle, it seems it’s coming from the front. It’s not always present, like it takes an hour or 2 of driving before it starts being audible. I guess maybe after everything is nice and hot. It only happens when I come to a stop. The car has to be in gear and foot all the way down on the brake.
Honestly I’m not sure what it could be, my mechanic was saying it might be the timing chain since this is kinda the mileage at which issues like that arise for this vehicle. The mechanic didn’t do anything to it, it was his opinion after I explained the issue to him.
The idle seems to run a bit more rough as well after like an hour or so.
Has anybody else had this kind of issue?
Thank you!

 

[2020FordRaptor]

Could it be the Cam Phasers?

 

[Timo2824]

Are you positive it's not coming from the passenger side rear head? I'm wondering if it's your vacuum pump since depressing the brake causes the noise.

 

[Mooncaller]

Could it be the Cam Phasers?

I looked up the noise that those make and it’s not that loud.
I will try to upload a little video to youtube when I get home and try to post it here.

 

[2020FordRaptor]

I looked up the noise that those make and it’s not that loud.
I will try to upload a little video to youtube when I get home and try to post it here.

Cam phasers start quite and continually get louder.

 

[tacoduck]

I thought the cam phaser rattle sounds are most apparent right at cold start. Op states the noise is most prevalent after a couple hours and a warm engine.

 

[Mooncaller]

Okay, sorry I took a second to get this ready.
Here's the link to youtube.
Might want to use headphones to hear it better.
The noise comes and goes and it only happens after the engine has been running and I stop with foot on the brake.

Engine noise

www.youtube.com

 

[Offwego]

Check to see if any of your exhaust manifold bolts are missing. Just had to replace my manifolds and bolts. Upgraded to BD diesel, thicker and they use all the bolt holes in the head. This is a very common problem with this engine. Seems like there should be a recall.

 

[Mooncaller]

Check to see if any of your exhaust manifold bolts are missing. Just had to replace my manifolds and bolts. Upgraded to BD diesel, thicker and they use all the bolt holes in the head. This is a very common problem with this engine. Seems like there should be a recall.

The only recall that I was aware was for the blower motor for the front AC and I had that done.

 

[tacoduck]

Sounds like the serpentine belt. It sounds normal to me.