Overrun pulleys (OAPs) eliminate inertia effect of alternator on engine overrun allowing alternator to free wheel which stops severe belt whip and stress on belt tensioner. OAPs suitable for normally aspirated and supercharged engines that are prone to belt slippage and failure due to belt instability. 6 Rib and 8 rib versions available – simple bolt in place of solid alternator pulley. Impact fitting tools available separately and in complete tool kits for general OAP service.
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