         
CLUTCH PULLEYS It is expected that within a few years, the majority of alternators will be fitted with clutch pulleys, which may require replacement after 90,000 km or 55,000 miles. Clutch pulleys were designed to dampen the vibrations from the alternator caused during periods of high electrical demand and low RPM. These vibrations are damaging to belts, belt tensioners, and bearings in the alternator. Vibrations also may damage other components such as water pumps, power steering pumps, and AC compressors that are driven by the same belt as the alternator. The clutch pulley only turns in one direction. When under heavy load, the initial surge is transferred through the clutch allowing the belt to run smooth until the load has stabilized. Clutch pulleys require special tooling to remove from the alternator. Attempting to remove pulley without the tooling will result in damage to the rotor shaft of the alternator. 
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