2004 Jeep Grand Cherokee. Repair 4.0L Engine Process.
What the! A Jeep 4.0, in this condition? HOW! These engines are supposed to be bulletproof! However as we’ve seen on this channel, people can and will destroy everything including engines we deem indestructible.
The 4.0L is based on the old AMC 4.2 258ci, which was also a VERY good engine. The 4.0’s suffer from some common issues mostly related to poor castings, but are overall regarded as one of the most reliable engines of all time. They are one of my favorites, but I still sell these engines for a reason. This particular core is from a late WJ, I believe a 2004 Grand Cherokee. These late 4.0’s are probably the least reliable. I have never seen this kind of damage on such a low stress, low compression engine. How does this happen?
Why am I doing this? I own and run a full service auto salvage business called Importapart, and part of our model is dismantling bad engines to salvage the good parts to resell. We do not rebuild engines, merely supply parts to those that do.
I really hope you enjoyed this teardown. As always I love all the comments, feedback and even the criticism. Catch you on the next one !