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Jeep Wrangler 4.0L Head Replacement

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Published on Nov 23, 2010

After the replacement of the head, it ran beautifully. Then some problems occured...
1. One of the rockers seized while driving (Horrid experience). They seized because of the previous poor lubrication by the antifreeze/oil mix. So, had to get new ones and fixed the problem.
2. A plug in the head near the far back right head stud was leaking antifreeze, so we took it out and put some high temperature sealant on it. Fixed. Apparently that plug is used on certain 4.0L's for some type of sensor.
3. Oil Pressure Gauge drops to 0 psi, but only under one circumstance... After the engine is fully warmed up, you have to shut it off and let it sit for a few minutes. Then turn it on and it will go up, and then straight down to 0. Once you start driving the problem goes right away.

I guess you could say, "It's a Jeep thing."

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