Litens 930012A OAP Overrunning Alternator Decoupling Pulley

The Litens 930012A is an Overrunning Alternator Pulley (OAP) — a precision-engineered alternator decoupling pulley manufactured by Litens, the world's largest supplier of original equipment (OE) power transmission products. This replacement pulley is an exact match in form, fit, and performance to the original equipment part.

The OAP pulley works by disengaging the alternator from the belt drive system during rapid engine deceleration, allowing the alternator to freewheel and then re-engaging as engine RPM increases. This decoupling action reduces stress on the accessory drive belt and its components, acting as a sacrificial protective element in the front-end accessory drive (FEAD) system.

Key Features:

• Manufactured by the original equipment supplier — exact OE form, fit, and function
• Disengages alternator during deceleration to reduce belt and drivetrain stress
• Ensures smooth, quiet accessory drive operation
• Designed as a protective, sacrificial component for the front-end accessory drive system
• 17mm spline installation/removal tool included
• Width: 40.0 mm
• Recommended replacement interval: approximately 70,000–90,000 miles under normal driving conditions
• 1-year replacement warranty if defective

The Litens 930012A OAP alternator pulley is a direct OE-quality replacement that restores proper belt drive function and protects downstream drivetrain components from torsional vibration and shock loading.