Thanks for speedy response..the belt doesn,t move off the pullies nor jump around so from your advise all would seem well..how do i remove the belt ?is there something i need to slacken off ??and if the bearings are getting a bit worn are the parts expensive and is it just a matter of undoing the large centre nut and taking it off..then reversal to replace..then how do i re tension the belt?
Easy peasy...
To remove the belt, get a 15mm spanner on the aux belt tensioner pulley (the one you say is moving). Turn it clockwise as if doing it up, and all the tension will be removed from the belt. Hold it there, pop the belt off, and slowly let it go.
You can then turn the pulley nut anti-clockwise, and remove the pulley.
From memory, new pulley is less than £30...
While it's off, check the condition of the belt and replace if needsbe.
Re-fitting is the reverse of removal, just install the pulley, turn the nut clockwise with a spanner, and while the tension's off, fit the belt over the pulley.
When you let go of the tensioner nut, it wil then apply the correct tension on the belt.