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The Borg & Beck BBA5087 Overrunning Alternator Pulley is an essential replacement component for vehicle owners and mechanics seeking to restore alternator stability and reduce belt system noise. Designed for specific Opel and Saab applications, this freewheel clutch pulley excels at absorbing rotational vibrations, thereby extending the lifespan of your accessory drive belt and tensioner; however, installation requires specialized tools and technical expertise to ensure it is correctly torqued to the alternator shaft.
| Model Part Number | BBA5087 |
|---|---|
| Brand | Borg & Beck |
With the belt removed, rotate the pulley by hand. A freewheel pulley will spin freely in one direction and offer resistance when turned in the opposite direction.
No, you require a specialized spline or hex tool set designed for alternator pulley removal to properly tighten the inner shaft nut.
The belt pulley diameter is 57 mm.
The unit typically includes the pulley housing; verify the contents of your specific package as per the included documentation.
No, it is designed for specific applications with a 17 mm shaft diameter. Always check your OEM part number before ordering.
The internal clutch bearing has likely failed; replace the unit immediately to avoid belt breakage.
Confirm that the overrunning function is working. If the pulley is seized (acting like a solid pulley), it will cause the tensioner to vibrate; replace the pulley.
Installation of the BBA5087 requires removing the alternator from the vehicle in most cases. You must use a dedicated alternator pulley tool kit (typically involving a multi-spline socket) to hold the shaft still while unscrewing the old pulley and tightening the new one to manufacturer-specified torque settings.
Compatibility Note: Before purchasing, cross-reference your vehicle's specific engine code and existing OEM part number. This unit features a 17 mm inner diameter; ensure this matches your alternator shaft diameter exactly to prevent mechanical failure. Periodically inspect the belt path and tensioner during standard oil changes to ensure the pulley rotates freely in one direction and locks in the other.
