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To change the belt tensioner in a 2014 Ford Explorer, start by using a ratchet or serpentine belt tool to turn the tensioner and slide the belt off the alternator pulley. It's a good idea to replace the belt at the same time since you'll already have it off. To completely remove the belt from the engine, turn and pull it until it comes off the crank pulley at the bottom. Next, remove the tensioner by loosening the four 10mm fasteners that attach it to the engine using a shallow socket or ratcheting box wrench. Once it's off, simply reverse the steps to install the new tensioner. If you need help with the belt routing, check the diagram under the hood for guidance on how it connects to the different pulleys.