Unveiling the Secrets Idler Pulley Noise Diagnosis and Resolution

In a pulley, if you spray the belt. and the noise gets louder, your belt tension is probably too tight. or it's too loose. And that could be due ... ... 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 Idler Pulley Noise Causes. The most common cause of idler pulley noise is a worn pulley or a slipping serpentine belt. It can also be caused by ... It sounds like it could be a water pump bearing, or alternator. That video makes it hard to diagnose. AC Delco Idler Pulley: http://amzn.to/2xJy6xK In this video I ... How to test which pulley is making noise on a vehicle squealing whining loud. With engine running using a spray bottle of water, spray some on belt. If noise temporary goes away, then you have a misaligned pulley, probably ... If the belt is on the engine and the engine is operating there my be a rattling or metal on metal screeching sound. Sometimes they make the clicking/tapping noise, a high pitched noise in tune with the revolutions, or I've seen others where the belt starts to ... If your idler and tensioner pulleys spin freely, they're bad. I would also spin the alternator pulley to listen for any noises. I've seen new ... Probably a bad bearing in one of the idler pulleys. Remove the belts one at a time and start the engine. When the noise goes away, you know ...