Mastering Idler Pulley Noise Troubleshooting and Repair

If you believe the noise is coming from the pulley bearing; while its making noise spray some WD40 into the bearing. If the noise goes away then you have found ... It's possible to squirt some Inox or similar stuff into the noisy idler pulleys which I have done, however this tends to dry out rather quickly. Spray either water, belt dressing, something (not oil or lubricants) at each of the bearing to see if the noise goes away for a second, if so, ... ... noise” from one of the engines serpentine belt idler pulleys. While most cars have just one idler pulley, the DB9 has three (3) plus the Anybody notice their topmost idler pulley making a rather disgusting sound? Mine sounds like it has sand in the bearings. I can hear it with the hood closed. 22:13 Go to channel How to Find Squeaking Whining Engine Noise. alternator, fanbelt, hydraulic pump. etc Mr. DIYer•45K views Replace entire belt tensioner and might as well replace the idler too. Tensioner is short. Also, aftermarket belts are more prone to noise. The timing belt got replaced half a year ago by previous owner. Not sure how good the job was done though... I will try out what you said and see if that's still ... The noise is not very pronounced but sounds like a bearing to me. I mainly hear it when the engine is idling or returning to idle after revving engine. If you hear a chattering, chirping, or squealing noise in the car, it's likely from a bad belt or from a seized or loose bearing in the pulley.