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Have you tried any engine additives, as few time they tend to relax the tappet quiet as much. Worth trying before you open the pandora box.

Hi Baraz, There are several possible causes for this tapping or knocking sound when the engine is hot, and unfortunately, being a Jeep, one of the most common causes is a problem with crankshaft bearings. However, I need a bit more information on exactly how the knock behaves, because there could be other causes as well: 1.) Does it vary with engine speed? In other words, does the knock increase in frequency as the engine speed changes? 2.) Does the knock become faster, or change in any way when you let go of the accelerator pedal? 3.) Does the oil presssure warning light ever come on, or does it take a long time to go out after starting the engine? 4.) Has the knock been getting worse lately? 5.) Did the knock begin suddenly, or did it develop over a period of time? It will help me a lot to diagnose this problem if you could answer these questions, but if possible, could you post a sound clip of the knock?