Help me diagnose this noise. 04 Disco

[cosmiccharlie]

04 Discovery, 73k miles. Started yesterday and it changes with RPM. Sounds like it is coming from the front of the engine, somewhere in the accessory drive belt. Any ideas?
<embed type="application/x-shockwave-flash" allowfullscreen="true" allownetworking="all" wmode="transparent" src="http://static.photobucket.com/player.swf" flashvars="file=http%3A%2F%2Fvid7.photobucket.com%2Falbums%2Fy263%2Fbugpower72%2F74E7DE63-DD2C-401C-8129-2EC14E74885B-1262-00000103BC2CF32F_zps3c0ce4cd.mp4" height="361" width="600">

 

[NickAdams]

Video not found.

 

[cosmiccharlie]

Try this.
http://s7.beta.photobucket.com/user...5B-1262-00000103BC2CF32F_zps3c0ce4cd.mp4.html

 

[primussucks]

Worn idler pulley bearing? There are two... one 80mm and one 70mm.
I recently had the 80mm bearing sieze up and fry on the road. Replace both (or you could press the bearings out and get new ones).

 

[jafir]

Are we listening to the whine or the tick?

 

[cosmiccharlie]

The whine. I was thinking the idler bearings too. Tick is gone now after a fresh oil change.

 

[primussucks]

Funny. Mine only ticks with fresh oil.

 

[mlnnc]

Do idler and tensioner pulleys typically get noisy like this when they are failing? That'd be good. I've wondered how I would know when it's time to change them.

 

[adriatic04]

Yes, specially when cold. They will squeal like a filthy pig. IMO these things go quickly on discos, comparing to my other vehicles.

 

[cosmiccharlie]

New pulleys on the way. I'll report back if the noise is gone after changing them out.

 

[cosmiccharlie]

I replaced both pulleys this morning and it still squeals. Thinking it's the compressor now.