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My 2003 2.5 CRD Grand Voyager has been a little grumbly when running. I suspected auxiliary drive belt items. Today I took off the belt and removed my alternator and checked the idler and tensioner. The decoupler on the Alternator squeeks when it is 'decoupling' - so I think that needs changing (special tool purchase required for that) and the bearings probably need replacing too. The Idler bearing has gone. It runs freely but there is a lot of play and it sounds dry - so that needs replacing. The tensioner seems to be okay, but I wonder if I should replace that as it's accessible at the moment. Although some of the Alternators online are frighteningly expensive, there are some that are almost reasonable. I'm thinking that getting one of these will be cheaper and quicker than buying a decoupler, tool and replacement bearings - any thoughts? The price of the idler and tensioner seem pretty high for what they are - does anyone know of a good website/place to buy these from? Has anyone replaced the bearings in an idler or tensioner? As always, any advice gratefully received.