Thanks. is this a garage jobbie? Wouldn't mind having a go myself, not completely useless. I did once (successfully) remove/dismantle/clean/replace a starter motor.
I also do a lot of the work on my motorbikes, so i'm i'd be willing if there were enough guides etc.
Is it a pricey job if done by a mechanic?
And would this definitely be the cause, as said it comes from the right side wheel arch, definitely a belt as you can hear it make it once every rotation.
You could do it yourself quite easily! but! as with most things Alfa you will need specialist tools, the aux belt is simple, get a 15mm open ended spanner and when you remove the wheel on the drivers side(UK) you will see the aux belt adjuster, just put the spanner on the outer most nut, turn anti clockwise and this will loosen the tension on the aux belt and remove, with the aux belt you have a idler and an adjuster, if you are getting a milk float noise it will be the idler and this can be awkward as you have little room to play with. adjuster is easy if that is shot. As for adjustment of aux belt, its simples as its self adjusting.
The balance belt, just needs a tensioner tool and the parts, here is a great company that do all the tools you will ever need specially for Alfa jobs, you could buy what you need use and then sell on.
Twinspark (16V) Aftermarket Tools :: TotallyAlfa
Aux Belt Job
Aux Belt Tension
•On the tensioner, undo the lower bolt, this will allow the spring to tighten it against the belt, the do the nut back up.
* If you release the bolt won't this release the tension from the belt? (If there is movement possible)
I believe you have
• To release the belt you need to slacken the lower bolt slightly, then with a 15mm spanner on the upper bolt (The one through the tensioner wheel) lever the tensioner anti-clockwise against the spring. The bolt is Left hand thread so won't come undone. to remove the belt, move it a bit and refit the belt
• Auxilliary units drive belt pulley securing screws 24+29 nm, 2.4+3.0 kgm.
• L octite 243 or 242.
If you pm me your email i can send you a few guides including a cambelt change undertaken by a German Alfa garage(6-Short videos)
As for tools totallyalfa is the place you need to shop.
PS: I know i have not touched upon the balance belt but! if you email i will send destruction details. (*NB*Some recommend removing the balance belt altogether, however, i do not have enough experience to comment upon!? However, i do like things to be as they are designed to be so i do replace mine)