The valve cover may be removed by first unplugging the cable in the negative terminal of the battery, after which the engine cover and air filter assembly are removed. Step two, loosen the ignition coils and label all the connectors and spark plug wires so that they can be reassembled easily. Unscrew the oil dipstick tube at the back end of the cylinder head on the right bank, and unscrew the PCV hoses out of each of the valve covers. In case there is a firm fuel line which is connected to the fuel rail, unwind it without losing sight of the warnings and fuel pressure relief steps. Removing the connectors and fasteners holding the engine harness assembly to the right valve cover and removing the camshaft cover at the front of each cylinder head/valve cover, tagging and un-connection of hoses and connectors as necessary, is required on 272 model engines (and later). Cut the mounting clamps in the back of the round centrifuge cover at the back of the left valve cover, then detach the center bolt and centrifuge be careful to prepare a rag in case the oil drips. The centrifuge-to-camshaft bolt is of an anti-clockwise thread. Then unscrew the bolts attaching the valve cover, keeping their positions in mind so they can be reattached in the same locations, and unscrew the valve cover, which may stick requiring a block of wood and a hammer to get it off. To install, the cylinder head and valve cover mating surfaces on both sides should be clean, and the rubber gaskets under reuse should not be damaged. On 272 type engines RTV sealant should be applied in the designated areas under the valve cover and employed to install the covers within 10 minutes of the sealant application. Wipe the mounting-bolt thread and thread holes. On 2005 and below models, hold the valve cover and valve gasket together and sequentially screw in and tighten the bolts to 200 inch max torque. Two-stage tightening procedure of the bolt should be followed in 2006 and subsequent models, the centrifuge is to be reinstalled on the right valve cover and the seal in the center of the centrifuge cover should be verified before re-installing. Last but not least, finalize the rest of the installation process in reverse sequence and begin engine cranking, inspecting thoroughly for oil spurts.