2L Auxilary Belt Noise - Alfa Romeo Forum
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(Post Link) post #1 of 6 Old 06-10-09 Thread Starter
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2L Auxilary Belt Noise

Hi,

What causes the auxiliary belt sqealing noise. Is it the belt tensioner or the ider pulley that causes the problem the most?

When I remove the belt no noise whatsoever, put it back and sqealing noise is there. Unfortunately it is impossible to isolate individual components to establish which part is causing problem. I have found this problem on my son's 156 and my gtv twin sparks.
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Couple of options:

1) Find a length of hose (10mm diameter or so). Stick one end in your ear and poke the other end around the aux belt area to identify what's squealing. Take care not to get the hose (or yourself) caught up in the machine!

2) Squirt the tensioner or idler with wd40 and see which one makes a difference.

Cheers,

Iain
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I would guess it is the moving tensioner. It is quite expensive and not usually changed as of often as it should be.

When my 156 started squeaking from the aux belt area, I bought a new belt and both tensioners. The squeak went.
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more than likely the idler pulley, in my opinion. i have had two fail in a year. both times changing them stopped the squeaking, so it was definitely the idler.
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The only proper cure is to bite the bullet and change both tensioners along with the belt.

It is going to cost around £100 all in but at least it will be cured for a good few thousand miles.
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Thanks for your assistance. Found source of problem. After removing, cleaning and regreasing tensioner and idler bearings, noise was still there. On closer inspection I noticed that belt had stretched to the point where it allowed the tensioner to extend to it's fullest point. This makes it a very rigid structure which then vibrates causing noise. Replaced belt and noise disappeared. So the first thing to do when noise is apparent would be to change belt and check that tensioner pulley is able to float as it tensions against the belt. Hope this info helps someone else.
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