Jeep 53021893AA Engine Camshaft Left

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2006 models are fitted with the Multiple Disposition System (MDS) that employs a specific camshaft that needs to be swapped with the kind used with the MDS design. First, put off the fuel pump and disconnect the cable from the negative terminal of the car battery. Have the cooling system flushed first and then remove the timing chain cover, timing chain and the sprockets and cylinder heads and lastly the radiator. Take out the slider rail mounting bolts and the sliders from the Lash Adjuster bores in the engine block and ensure that every Lash Adjuster has been restored to the bore it was removed from and also the right direction, which should be marked. Lash Adjusters should not be removed using pliers unless being replaced; this will harm their functions. Ensure you check with a dial indicator the amount of end play it has and make a note of any movement before you take out the camshaft. Use a pair of pliers and a wrench to unbolt and take out the camshaft thrust plate after which you use a long bolt to pull the camshaft. When the bearing journals are removed wash the camshaft and then look at the bearing journals with a micrometer to check for wear or damage. Every cam lobe should be measured and compared for height to detect a large difference. The lobes on the underside of the camshaft can be checked for discoloration, scoring or wear; provided they are still serviceable the camshaft does not need to be replaced. Visually inspect and clean the Lash Adjusters and camshaft checking that if Lash Adjusters are replacement a camshaft has also to be replaced. Before installing the camshaft, apply only a thin layer of installation lube on the bearing journals and lobes then cautiously position the camshaft into the engine in manner that does not harm the bearings. Replace the timing chain and sprockets, and apply clean engine oil to the Lash Adjusters before reinstalling them on their mounting points. The other steps of the installation process are the exact reversal of the above removal process. Lastly, change the oil with a fresh oil and a new oil filter, refill the cooling system with the appropriate coolant, crank the engine for necessary amount of time to check the oil pressure and leaks, and run the engine at a fast idle for only up to 15 to 20 minutes to seat the new components, change the oil and filter after every 500 miles of usage.

Install the bearing caps and bolts, tightening them hand tight before torquing them gradually, starting with the middle bolts.

Remove the timing chain wedge(s), install the camshaft position sensor, valve covers, and reconnect the cable to the negative terminal of the battery.

Install the timing chain and sprockets, lubricate the lifters with clean engine oil, and install them in their original locations.