Aux Belt - Failing Pulley?

[BillNick]

Hi all,

After I parked up at home following a long drive back from Bristol on Sunday, I noticed a mild smell of burning coming from the car. As I have had new brakes fitted recently I put it down to those wearing in after the long drive and thought no more.

However, when I next started the car I have now got a whining noise coming from the engine bay which follows the engine speed. Only way I can describe it is like a really old gearbox whine but not as loud of course.

I have taken the plastic covers off under the bonnet and by following the noise I am pretty sure it's one of the pulleys - which one I can't be sure. I could be seeing things but think I might be able to see the tensioner pulley wiggle very slightly from time to time - but could be my subconscious.  I have tried to wiggle each pulley but they are all pretty tight with the belt still on so cant feel any play.

Could the burning smell have been from the belt? Could a failing pulley cause the belt to rub/smell?

Anyone have any advice of how to diagnose which pulley myself? That way I can just either do it myself, or save on diagnostic charges when I hand it to my garage.

AC, Power Steering and Power all seem to working fine no faults...... yet. Car is 2008, done 70k and had a new water pump fitted 5,000 miles back.

Thanks in advance for your help.

Bill

[true blue]

Hi worn pully bearing is not un known but should not result in a burning smell .If you feel confident you can remove the serpentine belt and run the engine for a couple of mins  when all should be quiet .  It is then easy to check for play and /or noise when rotating each pulley .The pulley is self tensioning an can be slackened using a spanner and levering to release tension .In order to avoid confusion when refitting you may find it easier to use a phone camera or draw on paper the route of the run of the belt .Don't forget the alternator bearings noise/play 

Dave

Edited August 1, 2018 by true blue
Alternator added