Isit a toothed pully or a 65mm twinV, if its the twin V just loosen of the charger, unhook the belts and remove the pully with a chainwhip, sorta like a pushbike chain, it holds the pully whist you undo the bolt holding the thing on, only change the belts if they need changeing, no point in throwing money away! o and when you put the bolt back in locktite it in, last thing you want is it coming loose!