Dayco® Hydraulic Timing Belt Actuators are designed to absorb changes in loss of timing belt tension caused by variations in engine temperatures, speed or the general wear and aging of the belt. Maintaining belt tension at a constant level reduces noise, prevents belt flapping and ensures proper timing effectiveness throughout the entire service life of the belt. This Dayco® Hydraulic Timing Belt Actuator is manufactured to meet the critical OE quality, form, fit, and function requirements necessary for superior performance.