Opinions from the Jeep Gurus (Jerry, Distorted, et al) Regarding Timing Belt Life - Jeep Wrangler Forum
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Old 10-17-2010, 01:19 AM   #1
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Opinions from the Jeep Gurus (Jerry, Distorted, et al) Regarding Timing Belt Life

Got an email from my grandpa who's been reading AllData on his vehicles a lot lately and he wanted to let me know about the recommended change intervals for the 4.0L engine in regards to the timing belt, especially since its an interference engine.

According to AllData, the timing belt should be changed out every 102,000 miles.

When I replied saying I post on a Jeep forum and not once have I seen anyone post about snapping their timing belt in the year I've been on here...he freaked out like I was gonna have my engine explode if I didn't change it asap...so to you Jeep gurus...how common is it for a timing belt to be worn out at 102,000 miles on the 4.0 engine and is it necessary to replace it before then or what is your experience?

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Old 10-17-2010, 01:30 AM   #2
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The 4.0 doesn't have a timing belt, it has a timing chain. There is no real service life, it should last as long as the rest of the engine mechanically. One thing is when you do change a timing chain you should always do it as a set with new chain, and gears as they wear together.

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Old 10-17-2010, 01:34 AM   #3
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I didn't know that the 4.0 was an interferance engine. Learn something new every day. I, for one, am glad it doesn't have a timing belt then. Volkswagen TDIs are interferance engines and hve a belt, so they must be serviced periodically to try to prevent timing belt breakage.
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Old 10-17-2010, 02:16 AM   #4
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I'm not sure this is the same 4.0 listed...because it also listed it as having a timing belt...

Unless it was just lumping belt and chain in the same category... I'll try to upload the file in a few.
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Old 10-17-2010, 02:42 AM   #5
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Mine has a chain, per the FSM. (2000) I had to look it up and see, the suspense was killing me.
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Old 10-17-2010, 05:36 AM   #6
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My 04 2.4L has a belt and is an interference engine. The book calls for a replacement every 90K.
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Old 10-17-2010, 06:45 AM   #7
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I remember reading my 99 has a chain and have seen no recommended service pertaining to it.
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Old 10-17-2010, 06:53 AM   #8
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Chains do not require changing unless you do not change your oil and the enging sludges up and you lose lube. I worked in a dealer for 13 years and seen a lot of them fail for this reason but never seen one fail if properly maintained. My last 3 vehicles ran 200K w/o a failure.

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