Some engines above are provided with Multiple Displacement System (MOS) utilizing a particular camshaft, and the camshaft should be replaced with the intended camshaft type MOS. If the camshaft is replaced, all Lash Adjusters must also be replaced because they will have worn when the camshaft was worn and will continue to wear as the new camshaft wears. First, drain off the fuel system pressure and then, detach the connection of the negative terminal of the battery. On 2015 and later models with an Intelligent Battery Sensor (IBS), this connector should first be disconnected. Pull the coolant, next you remove the timing chain cover, timing chain and sprockets, cylinder heads and radiator. The Lash Adjuster rail mounting bolts to be detached from the engine block as well the Lash Adjusters which ought to be labeled so that the position of each of them may be ascertained. The Lash Adjusters might require a special tool for the removal, though, they can also be removed by a magnet or fingertips. It is recommended not to use pliers, in case of it, if the Lash Adjusters are to be changed, as this will cause their damage. For the 6.4L engines with the MOS, this may require correct deactivating roller Lash Adjusters in some cylinder. Before you uninstall the camshaft, use a dial indicator to gauge the endplay so as to document the movement. Loosen and take out the camshaft thrust plate, to take out camshaft, support it around the block area. Post extraction, degrease the camshaft and check bearings for wear or damage of journals because if the journals are worn or damaged then the camshaft and bearings may have to be replaced. The bearing journals and cam lobe heights should be measured to determine whether or not they have worn out excessively. It is also possible to check the camshaft lobes for discoloration and wear and the Lash Adjusters are to be cleaned. However, if new Lash Adjusters are used, the new camshaft has to be used likewise: do not reinstall used Lash Adjusters where the original camshaft has been removed. Grease the camshaft bearing journals and lobes and then gently push the camshaft into the engine. Fit in the camshaft thrust plate along with the timing chain in a correct manner so that the correct timing mark is achieved. Clean the Lash Adjusters with clean engine oil and re-installation of the Lash Adjusters in their rightful positions, and after that one fits the Lash Adjuster rail and tightens the mounting bolts. Perform what is known as the reverse of the removal steps, replenish the oil and filter, the cooling system, and after turning on the engine to check for oil pressure and leakage. If new components are added, it is necessary to idle the engine at about 2000 RPM for 15 to 20 minutes in order to seat them, and the oil and new filter after 500 miles.
