Overheating

headgasket would be one of the only things left that i could think of

i work in the automotive machine shop the 4.0l tend to crack the casting will split in the center BETWEEN the 2 valve seats and will cause coolent to be burnt in the combustion chamber best thing to do is to pull the head and sent it to a automotive machine shop ask for this to be done clean and crack test the head... if its not cracked do a leak down test on the valves to make sure there not leaking *****i would change the valve seals**** your allready there and they come in the top end gasket set resurface the head!! and your ready to rock!!! also the head bolts on the jeep are "torque to yeild" wich mean one time use only DO NOT REUSE the head bolts get a new set!! here is the part numbers for the stuff you will need hs9076pt-3 FEL-PRO head gasket set

Glenn I think you may have solved my issue with the head bolts, didn't know that jeep made their head bolts one time use, so I need new head bolts every time I take the ones already on the motor out?