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Dayco's Automatic Belt Tensioner features a patented "flat spring" design that's engineered to provide less operating range variations in tension. This reduces the risk of premature accessory bearing failure due to high tension when a new belt is installed. It also lessens the risk of belt squeal and slippage, or poor accessory performance caused by low tension after the belt begins to stretch and wear. A Teflon strip wound within the spring resists abrasion. The flat spring itself is coated to resist rust.

Other superior design features:
  • Heavy-duty cast aluminum spring case resists cracking and fatigue
  • Steel locator pin and pivot tube (where the application demands)
  • Heavy-duty cast aluminum arm offers additional strength and less distortion
  • Thermoplastic rubber "spring slot plug" keeps out harmful contaminants
  • Zinc coated mounting bolt (where included) resists rust, and is concentric for a more even degree of constant tension
Dayco - How Quality Tensioners Are Made
Installation Instructions
DirectionCounter Clock Wise
Belt TypeSerpentine
Number of Pulleys1
Pulley 1 Diameter (mm)76
Pulley 1 FlatY
Pulley 1 Width (mm)26
Alternate/OEM Part Number(s): 305233, 3L5E6B209AA, 3L5Z6B209AA, 89233FN, F27A6B209FA, F2TZ6B209B, F3DE6B209AB, F3DZ6B209C, F59E6B209AB, F59Z6B209A, F6DE6B209AB, F6DE6B209AC, F6DE6B209AE, F6DZ6B209A, F76E6B209AA, F76E6B209AB, F79E6B209AA, F79E6B209AB, F79Z6B209A, F79Z6B209AA, F8DZ6B209AA, YF1E6B209AB, YF1E6B209AC, YF1Z6B209AA, YF1Z6B209AB, ZZM115980, ZZM415980

Closeout Inventory Warranty Information:
Wholesaler Closeout items have a 30 day warranty (but still are covered by our Return Policy).

DAYCO Regular Inventory Warranty Information:
12 months/12,000 miles. Timing Belt Component Kits/60,000 miles, or the life of the automotive manufacturer's original recommended replacement interval.