What Sound Does a Faulty Tensioner Pulley Make?

[OMadelyn]

The abnormal noise from a tensioner pulley manifests as a continuous squeaking sound near the engine belt, with the pitch becoming sharper as engine RPM increases. Below are relevant details: Function: The tensioner pulley is a belt tensioning device in automotive transmission systems, designed to adjust the tightness of timing belts, automatically regulate tension force, and ensure stable, safe, and reliable transmission. It primarily consists of a fixed housing, tension arm, pulley body, torsion spring, rolling bearing, and spring bushing. Noise Location: First, identify the source location by opening the hood to determine whether the noise originates from the top, middle, or lower section of the engine, or its front, middle, or rear areas. The characteristic sound of a faulty timing belt tensioner pulley bearing closely resembles that of power steering hydraulic pump bearings or alternator bearings—a continuous "rustling" noise that sharpens with rising engine RPM.