Just though I would bring everyone upto date with what is going on, yes still. The head was removed and a valve seat had dropped holding the piston open. This was replaced and the head refitted, 3 K down the road on the dealer test drive and it dropped another seat. The engine builder said the engine has no signs of overheating. He believes that it is a fuel mixture problem that has caused the problem. He wants to replace all valve seats to ensure it does not happen again. Another engine builder advised me this was the correct method as there was a Technical Bulletin that advised that there is a problem with the material used in the intake valve seats causing them to drop. If this happens all seats must be repalced. My question: has anyone seen such a bulletin and if so where could I get a copy. Is there a site that shows TB's for Jeep. Thanks for all your help. Jeep has been off the road with the dealer since April and still not going.
Thanks Frango, I have check all of the TB's but they do not show any info on 4.7L HO valve seats, could there be other TB's. They also do not show Blend Doors, Seat Heaters or CD stackers in the 2002 model???