Maybe its just the angle of the camera, but it looks like the PS pump pulley is out of alignment with the idler pulley. That could cause a belt to chirp. Its visible at 0.04 of the video

 

I’ll take a good thorough look at it. Would over tightening the belt cause it? What would cause that pulley to misalign? I did put a couple drops of Hoppe’s in that bearing when I recently cleaned it. There was a lot of grease grime around it on the backside. I’m wondering if I compromised it?

 

Loosen the belt and rock the pulley's, basically the same test as for a ball joint. If the bearings are loose, the pulley will rock a hair. You can also turn them by hand and feel for a "gritty" feeling or a roughness that would indicate the bearing is bad.
Overtightening the belt could (in theory) bend the pulleys shaft, but man, you'd have to really crank it to do that. I can't say I've ever heard of it happening myself.
Holding a straight edge across the pulley while turning it will show if the pulley itself is bent.
I didnt notice anything in the video that would make me think it was a bent pulley, none were wobbling or spinning funny, just the angle the belt was coming off that idler showing the two pulleys arent in the same plane.

 

The idler misaligned from possible bearing failure, is likely cause of the belt looking like it does.

 

I'm going with the idler bearing

----JEEPFELLER

 

UPDATE:
Turned out to be a pulley bearing. Checked the pulley alignment; good. Checked the belt tension; way too tight. Removed belt and started it; no squeal. Spun each bearing individually and the one by PS pump was toast.

Also, is it normal for that PS pulley to be so tight to rotate?

I also spun the alternator and it felt too rough. It’s a 10si that’s been rebuild to 94A internals. So I will swap out tomorrow with my 12si that’s been rebuilt to 140A and move forward. I have never installed the 12si; been on the shelf, but looking forward to it. It’s set-up to charge my system at idle. The 10si doesn’t. You need higher fwy rpm’s to get a good decent charge … one of the reasons I trickle charge it regularly.

 

Glad its resolved!! WTG

 

 

Looks like I was the winner!

----JEEPFELLER

 

No it was me............I am the winner!

 

I have the same dam noise, and I replaced both of my pulleys. Maybe I have my belt too tight.

 

Remove the belt and spin the pulley’s. You will hear a noticeable difference. Loosen as needed.

I had a back-up bearing (6203RS) which is in the freezer right now. I am about to put the pulley into the oven at @ 140° for 10-15 minutes, drop the bearing in place from the freezer.

*** that’s the bearing part number currently installed. Correct me if I’m wrong. Seems like the I.D. may be a tad too large?

 

That's correct. The ID is too big on all the the ones I found. That's why I bought new pulleys. Even the new pulleys bearing's ID was too big but they came with a bushing installed.

 

What do the bushing look like?

 

 

I have a 93 XJ that had a noise at start up and went away once it got hot. Ended up being the harmonic balancer.

 

UPDATE:
New bearings and realignment. Honestly, it was actually a long dragged out morning tackling this. I dropped items 5X’s and unfortunately it took over 20+ minutes to find each one of them. One of the bolts actually rolled into the hedge, grrrr. Very odd!

I had to Dremel a bit because the OEM flanged washers were old and tired. They were showing fatigue. That wasn’t fun!

Also, oddly enough, the fan belt I previously had installed ended up too long. WTF? I swapped it out for one of my older spares and BAM … perfect fit. I have no idea why and how that happened. At any rate, it’s done. On to the next ordeal!