Freewheel Clutch/Pulley for alternator. This unit is standard equipment on all Sprinter alternators. THIS IS A CRITICAL COMPONENT OF THE SERPENTINE BELT SYSTEM AND A KNOWN CAUSE OF BREAKAGE PROBLEMS
IT IS COMMON FOR THIS DECLUTCHING PULLEY TO FAIL, LONG BEFORE THE ALTERNATOR WEARS OUT. A special tool is required for installation of this unit and are not usually replaceable outside a repair facility.
If you are purchasing a new alternator, you will not need to buy this, as the alternator is furnished with a new pulley.
Sprinter II 2007-2018 3.0L V6
This is the identical OEM pulley sold at a franchise Dodge, Freightliner or Mercedes dealer.
Fits all Valeo alternators...180 and 220 Amp
If you have had problems with snapped serpentine belts or a broken belt
tensioner arm or roller, this declutching pulley has most likely
failed. When operating correctly, this unit has a one-way clutch to
minimize belt flutter and therefore, stress. Over time, this pulley will seize, thereby
losing its one-way decoupling action.
Video demonstration of why this device is a critical component: