Starting in ABOUT '99, the 4.0 went to the 0331 cylinder head. (previously they used the 0630 head) The 0331 heads are prone to cracking. Jeep/Chrysler didn't get this head fixed for several years. I would take the head off and get it checked for cracks. If it was mine, (and it's not remember) and you found you had the 0331 head, I would probably take it off and have a new one put on. Resist the urge to put on a used 0331 head. There are new replacements still on ebay that will fix this. These heads will probably be made in Brazil or China, but they are good replacements that are not prone to cracking. BTW, I have two '96 4.0 Jeeps with the 0630 head that I've had to replace because both cracked. Supposedly, these are the good crack-resistant heads and they haven't been overheated. The Jeep 4.0 has a cult following that says it's a good engine, and it is. It's just not as good as the old Ford 4.9 six.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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