Aux belt Sqeek

[MJRacing]

Another aux belt problem on my 172 cup.
Long story short....
Belts replaced by specialist in November. Two weeks later the aux belt starts chirping on idle that gets worse when the accelerator is pressed.
Local garage checks belt and re tensioned on the advice of the specialist but does not cure the problem. However a little mist of duck oil does....for an hour or so.
Ended up changing the belt for a new genuine belt and with my limited mechanical skills checked the pulleys for any play and damage and great no chirping....for two weeks anyway where the chirping is back again.
Going to take a look on the weekend but what should I be checking/looking for? Obviously the belt is ok but something is not right.
Any help welcomed.

 

[MJRacing]

OK so I've cleaned up a slight lip on the idler and checked the tension, no more chirping on idle. Press the accelerator and it's back, clutch in and it's gone. A mist of water on the belt and it goes.
Surely can only be an issue with the belt?
Any one?

 

[flebay]

OK so I've cleaned up a slight lip on the idler and checked the tension, no more chirping on idle. Press the accelerator and it's back, clutch in and it's gone. A mist of water on the belt and it goes.
Surely can only be an issue with the belt?
Any one?

 

[MJRacing]

Top man.
Being Welsh it's going to have to wait until tomorrow before I can go investigate but good starting point.
Cheers

 

[RichieJA]

I had this was the pas pump, be careful as the belt jumped teeth after a while and if it slips off bye bye engine, avoid recon pumps one I bought failed after 2 months,

Also put tipex on your crank pulley across the rubber bit and check incase its that, they are two piece and when the rubber goes they can slip and eventually come apart and again bye bye engine

 

[MJRacing]

Sorry forgot about this but to update incase anyone else has a simular problem.
Took the belt off and had a proper look and there was a small lip on the power steering pulley. Cleaned the pulley up and took the edge of the lip off, refitted and it's been spot on since.