Bad Idler pulley?
My car making annoying whine sound.
Upper Timing Belt Cover & Idler Pulley Removal
"In this clip, we're going to talk about the proper service procedure to replace your engine's timing belt, and water pump. In this ...
BMW Idler Pulley Removal : DIY [ How To ] /// 330i ( ...
How to remove and replace a worn out idler (deflection) pulley on a BMW 330i (E46) NOTE: You'll need to loosen/remove the main Serpentine Belt ...