Dayco Overrunning Alternator Decoupler Pulley

The Dayco Overrunning Alternator Decoupler (OAD) pulley is an alternator pulley, also called an alternator decoupler pulley or overrunning alternator pulley. It replaces the solid pulley on the alternator in serpentine belt drive systems. It uses a one-way clutch to let the alternator spin freely when engine speed drops or fluctuates. The pulley reduces belt slip and vibration, and it helps protect the belt and tensioner from torsional loads.

Key Features:

• One-way clutch design lets the alternator overrun when the engine decelerates, which reduces shock loading on the belt drive
• Helps dampen engine vibration and crankshaft speed fluctuations that reach the accessory drive
• Reduces belt noise, slip and wear, and can help extend serpentine belt and tensioner life
• Precision-built to match the original equipment design for a proper fit and reliable operation
• Fits the OE pulley position on the alternator shaft, so it replaces a worn or failed decoupler directly

Benefits:

Dayco is a long-time supplier of belt drive components to OE manufacturers and the aftermarket. A worn decoupler can cause belt chirp, rattling, squealing or uneven belt wear, and replacing it restores smooth accessory drive operation. Dayco recommends replacing the serpentine belt and checking the tensioner when the decoupler pulley is changed. Select the correct part number for your application from the variants listed.