strange noise ..thoughts needed please

[dg45]

the old girl has developed a bit of a noise,started a week or two ago and i first thought the belts were getting knackered and squeeky so tryed a bit of wd40 and that queitened it down for a couple of journeys but then noise returned and seemed worse so replaced belts with some new ones and still not sounding right got a proper whirring noise when up and down on the revs ,don't know now if its belts or water pump bearings or alternator etc.

shot a bit of video on the phone so you can hear it .

http://www.youtube.com/watch?feature=player_profil...

any thoughts/idea's/solutions welcome

[odyssey2200]

Run the engine with the belts off

is the noise gone?

Is it worse with the lights etc on (loading the alternator)?

Check the tensioner roller for harshness.

[dg45]

have run it with no belts and it was ok

[snotrag]

Belt tensioner pulley or idler pulley would be my guess, had me stumped for a while when a 6 month old one failed on me. Sounded horrendous too.

Had ever so slightest, barely perceptible roughness to the bearing. Replaced, noise gone. Just a bit of a bummer to get to thats all.

[dg45]

Are you meaning the tensioner on the cambelt snotrag ..?
When running engine with alt belt and power steering belt off it's fine no dodgy noise at all , have had a tensioner pulley go before and that was a right rough rumble /rattle sound .
Will strip belts off later and have another rumage .

[snotrag]

Ah I see, yes, makes sense now. So it wont be that. In which case water pump would be a good bet. Can you feel any roughness in the pulley?

What do the bearings in the Alternator and PAS pump feel like then?