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I suspect that the head gasket is not under the proper tension
IT is very common for people to refit heads without first cleaning out the head stud holes ( thread tap and compressed air)
there is normally water or oil in the hole and as the stud is screwed it it compresses the water/oil and reaches tension by bottoming out on the obstruction but the gasket is not tight
sounds like you have a cracked head or a blowen head gasket, take the small black hose that is connected to the filler bottle (coming from the radiator cap) and put the end of the hose from the filler tank in a half full bottle of water make sure the end of the hose is under the water, start the engine and run for about 5 to 10 minutes, if there are bubbles coming from the hose this will tell you the head has a crack in it or you have a blowen head gasket. take it to your mechanic for repairs
If the head gasket is blown, it will surely require replacement. Before doing so, please check the cylinder head for cracks or breakage for replacing the head gasket is useless if the engine block is damaged.
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Clutch Fan are known to fail over time, but I wold not rule out the radiator. The small passages inside the radiator will clog due to age. You did not mention how many miles are on the Jeep or if the Aux fan is kicking on.
lots of causes , is the anti freeze mixture right?? level good, could be a plugged rad, head gasket leak although not common on jeeps, or poor circulation of fluid, even a collapsing hose, and have the system pressure checked including the rad cap
you might have a blowen head gasket check and see if thers oil in the eng blog were the plugs go. if so then you need a ne headgasket seel there pretty cheap if not then you have probly blow a enter seal that's more tricky but still can be done hope this helps
Changed the cylinder head gasket or valve cover gasket? Did timing chain fail or did it overheat? (can't draw a correlation between the two) If chain failed you may have bent a valve. I believe you have to go at this step by step. from what you wrote, you are not going in one direction that isn't productive. Test compression with a gauge, if you can, have a leakdown test done. You may have other problems as well and I don't see where you did anything about the cause of the overheat??? If you can, have someone with some experience help you "hands on". Good luck I'll answer whatever I can from this end.