The camshaft bearing caps are numbered and lettered and are fitted with a raised arrow; the number refers to the bearing journal position from the front of the engine, the letter to the camshaft and the arrowhead is at the front. For this procedure, special timing chain holding tools EN 48383-2nd EN 48383-3rd are required; otherwise, the timing chain cover has to be detached in order to keep the chains connected to their lower sprockets. First of all, the negative battery cable should be disconnected, the valve cover(s) should be taken off, and depending on which camshafts are being removed the high-pressure fuel pump, for 3.0L, and the lower intake manifold, for 3.6L. Next to do, remove the Camshaft position sensors and the camshaft position actuator solenoid valves. Turn the engine over until the camshaft flats are parallel with the ground, measure the amount of In/Out and be very careful not to damage the camshaft. Lose the camshaft position actuator bolts, position the special tool to hold the timing chain and sprockets, then remove the actuator bolts. After the assembly place all the bearing caps in specifically marked box, unravel the camshaft bearing cap bolts in the reverse procedure that was used to tighten them, to do a check on the camshafts for wear or damages make use of the micrometer. Scrub the camshaft, check the bearing journals for any wear, measure the wear of the camshaft lobes and look for any signs of damage. Check the camshaft bearings and measure the bearing oil clearance; if clearance exceeds the standard it is usually advisable to replace the bearings and this is best done by a professional. For installation; before fitting the camshafts to the engine, the camshaft bearing journals and cam lobes needs to be lubricated, the correct position of the camshafts need to be ensured, the bearing caps need to be smeared with a layer of engine oil, and then the bearing caps have to be fitted to their correct position in the newly fitted camshafts. Loosen the bearing cap bolts and then assemble the cap back on the shaft and torque each of the bolt to required specifications. After ensuring the efficient working of the timing chain holding tool, start the engine and to finish the job reverse the whole process of removal. Before starting of the engine, it is required to replace the oil filter and to change the oil also.