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Message: <blockquote data-quote="Steve Brothers" data-source="post: 1049419" data-attributes="member: 62082">Like Dillard says, the right rear one is easy to get at if you Jack up the truck and remove the right front tire. Support truck on Jack stand and remove the wheel well splash guard (if you have one). You can then see the chain tensioner and (and spark plugs!)  I use several long extensions and a breaker bar (or large socket wrench) to remove it as it is often hard to loosen.  This tensioner has a shallow head, so be careful to have the 27 mm socket fully engaged. When you install the new one, use Motorcraft brand only (7U3Z6K254A) and new gasket (XU2Z6M252AA), making sure the gasket is seated correctly before final tightening. If you are not careful, the gasket can get tweaked and damaged, and oil will leak. Torque to 32 ft-lbs with new gasket (or about twice that if you are trying to reuse an old gasket). Use a six point standard depth 27 mm socket on the right lower tensioner. The top left tensioner is more involved, as you have to remove other engine parts to get to it, but it can be done with care. Just allow more time and replace throttle body and intake manifold gaskets with new ones to prevent vacuum leaks if you remove these parts.</blockquote>