Intermitent Clutch (i think) Squeal

[alex22808]

Originally Posted by CTScott

The happening most when it is cold/damp really points to the belt. The Yaris is tricky with belt tightening because it does not have a screw tension. Rather you have to pry the alternator away from the block and then tighten the bolt, so there is far less precision to tightening it than with a screw tensioner. Some brands of belts are better than others when it comes to squeaking. I have found that Dayco belts are the worst with the Yaris, where short of overtensioning the belt you can't make them stop squeaking (and that's when they are only a month or two old).

In terms of checking the belt, what should i be looking for beyond the ribs being worn?

Also, there seems to be no tensioning device on the belt, unless it is on the underside. The belt just seems to fit round the 3 wheels and is tight just like that.