Dayco 89253 No Slack Automatic Belt Tensioner Assembly

The Dayco 89253 No Slack Automatic Belt Tensioner Assembly is engineered to maintain optimal serpentine belt tension throughout its service life, eliminating belt squeal, improper tracking, and accessory performance issues. This professional-grade tensioner features Dayco's patented flat wire spring technology with a specially coated PTFE string that provides concentric internal tension for consistent performance while dampening noise and resisting abrasion.

Key Features:

• Heavy-duty cast aluminum spring case and arm for superior strength and crack resistance
• Flat spring technology automatically compensates for belt stretch and wear
• 6-rib serpentine pulley design with 76mm (3.0 inch) diameter
• Counter-clockwise rotation with steel pivot tube for enhanced stability
• Premium thermoplastic rubber spring slot plugs and O-ring seals keep contaminants out
• Zinc-coated mounting bolts resist rust and corrosion
• Steel locator pins and arm plates for precise installation
• Made in USA with 1-year warranty

This OE-quality replacement tensioner is designed to outperform and outlast factory parts, reducing the risk of premature accessory bearing failure due to improper tension. The precision-engineered design maintains constant belt tension across all operating conditions, ensuring reliable performance for alternators, water pumps, power steering pumps, and air conditioning compressors.

Replaces OEM Part Numbers: GM 12554027, GM 12580162, ACDelco 38158, Gates 38158, Dorman 419-112, and others.