Dayco 89392 No Slack Automatic Belt Tensioner Assembly

The Dayco 89392 No Slack Automatic Belt Tensioner is a self-adjusting serpentine belt tensioner engineered to maintain constant belt tension throughout the life of your accessory drive system. Designed to meet or exceed OEM specifications, this tensioner is a direct-fit replacement that resolves common belt drive issues including belt squeal, improper belt tracking, and accessory failures.

Utilizing Dayco's proven flat spring technology, the 89392 automatically compensates for belt stretch and wear by increasing torque transfer to the belt as needed, ensuring consistent tension without manual adjustments. The unit features a smooth pulley with a 2-1/2 inch outside diameter and a clockwise operating direction.

Key Features:

• Self-adjusting spring-loaded design maintains constant belt pressure — no manual tensioning required
• Flat spring technology compensates for belt stretch and wear over time
• Cast aluminum housing and arm for strength and long-term durability
• Steel locator pins and arm plates for precise alignment and secure mounting
• Lubricated bearings with high-temperature seals for peak performance under demanding conditions
• Superior resistance to dirt, salt, chemicals, and under-hood contaminants
• Smooth pulley — 2-1/2 in. outside diameter, 25 mm width
• Sold individually; includes pulley assembly

Cross-references OEM part numbers including Mitsubishi 1345A008, 1345A060, 1345A079, Chrysler/Dodge 4891595AB/AC/AD/AE, Gates 39053, ACDelco 39053, and Goodyear 49434. Engineered by Dayco, a global leader in drive system solutions since 1905.