What are the causes of engine idler pulley noise?

[SanGage]

Engine idler pulley noise is caused by damage to the idler pulley; failure of internal bearing balls, etc. Engine Introduction: An engine is a machine that can convert various forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. Engine Working Principle: The working principles of two-stroke engines and four-stroke engines are different, with the vast majority of automotive engines being four-stroke. The working cycle of a four-stroke gasoline engine consists of 4 piston strokes: intake stroke, compression stroke, power stroke, and exhaust stroke.