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I have a 2004 TJ with the 4.0 engine with 160k miles. Running great. Do I need to worry about a timing belt on this engine or is it a chain?
 

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The chain will outlast your Jeep. No worries.
Not always.... have seen several 100k+ 4.0's w a worn timing chain....
Haven't seen one actually break but have seen reduced power and mpg's...
 

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My first engine had 319,000 still had the original timing chain when I pulled it out, this engine I bought used with 125,000 and have put 100,000 and still going strong.
 

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Timing chains can stretch over time, causing the need for replacement. In general, they do last the life of the engine.
 

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Timing chains can stretch over time, causing the need for replacement. In general, they do last the life of the engine.
Remember the days when Detroit used plastic gears with timing chains, You were lucky to get 75,000 miles on a Pontiac before you had the chain slip a notch or two.
 

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I replaced the timing chain and sprockets on an XJ 4.0L at 147k miles. There was a very noticeable improvement in engine performance. (Still running great 12 years later at 202k miles.)

In general, they do last the life of the engine.
If "lasting" means that they remain in one piece, that's a reasonable claim.
 
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