Import Line Designed for Foreign Nameplate Vehicles
Dayco® No Slack™ Idler/Tensioner Pulleys
Dayco Automatic Belt Tensioner features the original flat spring design engineered to provide less operating range
variations in tension. This innovative design reduces the risk of premature accessory bearing failure due to high tension
when a new belt is installed and lessens the risk of belt noise and slippage, or poor accessory performance caused by low
tension after the belt begins to stretch and wear. A PTFE strip wound within the spring resists abrasion and the flat spring
is coated to resist rust.
Steel locator pin (where the application demands).
Heavy duty cast aluminum spring case that resists cracking and fatigue.
Heavy duty cast aluminum arm offers additional strength and less distortion.
Steel pivot tube (where the application demands) provides additional strength for critical torque requirements.
Thermoplastic rubber spring slot plug (where applicable) helps keep out harmful contaminants.
Lubricated nylon pivot tube bushing and spring bushing for quieter performance.
Rubber “O” ring which seals against dust and grime (where applicable).
Zinc-coated mounting bolt that resists rust.
Bearing Inner Diameter 1
Max Belt Width
Number of Bearings
Pulley Outside Diameter
Alternate/OEM Part Number(s): 231133, 89133FN
DAYCO Warranty Information12 months/12,000 miles. Timing Belt Component Kits/60,000 miles, or the life of the automotive manufacturer's original recommended replacement interval.