Clutch Pulleys

QRS clutch pulleys are engineered to OEM specifications and feature a design which includes a grooved inner ring, radial support bearing, seals and outer ring with moulded face.

The pulleys are zinc-nickel plated to stop corrosion and are supplied in sealed bags within the box with a protective cap, where required, to prevent water and dirt contamination.

QRS OAP
Overrunning Alternator Decoupling Pulley

Whilst performing the same basic functions as the OAP, the OAD’s one-way clutch also incorporates a torsion spring which absorbs the base engine vibrations and prevents them from reaching the alternator’s rotor. This type of pulley is increasingly used on newer vehicles and vehicles with high torque levels.


Overrunning Alternator Pulley
The overrunning alternator pulley (OAP) is designed to decouple the rotor from the deceleration forces and allow the alternator to overrun, thus alleviating much of the stress on the belt. It has a one-way clutch inside the pulley, allowing the alternator’s rotor to coast to a stop position when the engine is shut down, eliminating the possibility of slipping. QRS OAPs reduce belt vibration, noise, load and tensioner movement, increasing the lifespan of the system.