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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)74
Pulley 1 FlatY
Pulley 1 Width (mm)39.25
Alternate/OEM Part Number(s): 05086958AA, 3947574, 5086958AA, 5297324

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

Regular Inventory Warranty Information:
12 Months/12,000 Miles