Dayco 89479 Heavy Duty Automatic Belt Tensioner

The Dayco 89479 Heavy Duty Automatic Belt Tensioner Assembly keeps constant tension on a serpentine belt drive. It is built for heavy duty diesel engine accessory drive applications. Serpentine belt drives use a single belt to power most, if not all, of the engine's accessories.

Key Features:

• Automatic tensioner for serpentine belt systems
• Single pulley, 74 mm diameter, 39.25 mm wide, with a flat face
• Counter-clockwise direction
• High-strength cast aluminum body that helps keep contamination out and resists cracking, fatigue and deformation
• Cast aluminum body and pulley arms add strength and durability while reducing weight compared with regular belt tensioners
• Highly damped design with a wave spring and a metal ring with a bonded polymeric surface. The ring acts as a radial shock absorber for the tensioner arm.
• Pulley has dual lifetime-lubricated bearings

Steady belt tension helps lessen belt noise and slippage, and helps protect accessory bearings from the effects of improper belt tension. Use Dayco 89479 when replacing a worn belt tensioner assembly.