To remove valve covers, relieve the fuel system pressure and disconnect the cable from the negative battery terminal. Then remove the upper intake manifold. Remove the cooling system, undo the coolant hose brackets from the cylinder head, and move the once-attached coolant hoses away from the valve cover. Disconnect the ignition wires and DPF EGR electrical connector. Remove the EGR pipe from the EGR valve and the exhaust manifold. To get to the supply line from the fuel rail, first disconnect the fuel line spring-lock coupling, then remove the fuel line bracket bolt and then separate the fuel supply line. To disconnect the electrical connectors of the fuel injector, and then remove the bolts of the valve cover. Lift off the valve cover, tapping it with a soft-face hammer to break the gasket seal. On the left valve cover, unplug the electrical connector at the camshaft position sensor and from the ignition coil pack. Take off the cable cover from the main electrical connector at the valve cover and push in the clip to release the other side. Next disconnect the fuel injector electrical connections, the Throttle Cable and the ignition wires. With the 10mm socket, remove the valve cover bolts and lift the valve cover off. If it is stuck, tap it with a rubber or plastic hammer. Use a shop rag and solvent to get the gasket surfaces on the intake manifold, cylinder head, and valve cover clean. Most valve cover gaskets have a self-sticking sealant; pull off the plastic film, and stick the gasket to the cover. Finish the installation by reversing the removal process first. Tighten the valve cover bolts evenly. Start with the center bolts and work outward to specified torque.