Question about Jeep Wrangler

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2002 Jeep Wrangler 4.0L Camshaft lobe failure at 38K miles. Mental in the engine, need new long block. Since Jeep has the 100K mile, 7 yr warranty, I missed the time limit by 1 yr. Any history of this type of engine failure to help me work with Jeep corporate to fix this problem without me paying around $8K dollars? This problem should have never happened. Please advise.

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  • garyblack619 Aug 04, 2010

    Over the past few days I have been searching the web to find other complaints about camshaft failures in stock Jeep Wrangler 4.0L engines with low mileage (38K miles), but no luck. I reviewed the link above to HOTROD magazine about oil additive ZDDP and I use Mobil 1 so I don't see a fit. Please review above comments and add additional advice and comments. Thanks so much!!!

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Hi! Yes you will spend a lot on this one on replacement. But i strongly suggest that you get the parts from a junkyard. Will surely cost you less just bring the original parts to serve as your sample. HOpe this helps and have a good one!

Posted on Aug 04, 2010

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The flat cam lobe problem has become pretty common lately with the 4.0l's. It may be due to the removal of an additive called ZDDP from modern engine oils. The additive was the main ingredient that kept metal to metal friction from destroying parts in older design flat tappet motors. The additive has the bad effect of shortening the cat-converter life. The manufaturers have to provide very long performance warrantees on the converters nowdays, so they wanted the additive removed. "SM" rated oil is the type that has almost no ZDDP in it. The Jeep 4.0l was perhaps the last engine still running with a flat tappet cam!

Here's a link to an article in Hot Rod magazine: http://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html
You might try searching for "ZDDP" and "cam failure' and you will see page after page of info on this!

Posted on Aug 03, 2010

  • garyblack619 Aug 04, 2010

    Thanks for the info on additive ZDDP... FYI, after about 10K miles I changed over to Mobil 1 and changed oil every four months. In addition to your comments about what you think the failure is due to, can you provide me with info to help me with working with Jeep to cover the costs? In my humble opinion, the problem is more due to poor metal. My machanic noted that only cylinder 5 lobe was trashed, and the other lobes look okay. I nolonger have access to the failing part as the Jeep dealer sent the part to Jeep. The jeep was driven lightly... 38K miles.

  • Jim Goldsmith
    Jim Goldsmith Aug 04, 2010

    I didn't find any class action lawsuits; but, you might want to check with a lawyer.
    I wish I could help you but, without the parts and, documentation I'm afraid you
    are in a hard place.


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