Dayco 89248 Automatic Belt Tensioner

The Dayco 89248 Automatic Belt Tensioner is a replacement component for the engine’s accessory drive system that automatically maintains proper serpentine-belt tension. It combines a pulley with a spring-loaded mechanism that adjusts tension as engine RPM and load change, helping prevent belt slip and wear over time. This part is specified by Dayco as model 89248 and is intended for applications that require this exact tensioner in the belt drive layout. By maintaining consistent tension, it supports dependable operation of belt-driven accessories such as the alternator, power steering pump, and air conditioning compressor. When replacing, verify that your engine’s belt drive layout calls for Dayco 89248 and follow standard installation practices for automatic tensioners, including correct pulley alignment and secure mounting.