Jeep 4.0 I6 Cracked Heads: What years/models are problems?

jay

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#1
I've been hearing about newer Jeep 4.0 I6 engines experiencing cracked heads.
What have others seen or heard about this? What years, models affected.
What area of the head is the crack typically seen?

I don't have anything in the shop with this problem; just trying to get some info.
thanks, jay
 
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#2
Jay, I haven't had to deal with any of them and I might be way off here, but I have heard that some of the ones that had the coil rail (coil on plug ) design were the ones that had the problems with the heads cracking...Supposedly you could pull the oil fill cap off and look in and see the crack,where it was letting water into the oil...Maybe I just heard stories,but I am sure one of the Chrysler guys can tell you if there is anything to it.I think it was like 2000- 2006 vehicles ...Jim