I just joined Saturday= Wanted a Jeep since I was 15, 33 years later got one Friday,for free. Its an 02 X with 188k miles. Has some crustiness and what has been deduced as a wrist pin knock, very mild. I am keeping eyes open for a good or rebuildable 4.o, but wanted to check here to see if anyone could point me to some good online or print resources on the 4.0 engines?