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Old 11-18-2012, 11:29 AM   #1
Join Date: Aug 2011
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Timing belt/ chain

I want to gain info from all the experienced jeepers- When would you recommend changing the timing belt/ chain on a TJ?

I have a 2002 Wrangler X 4x4 and 4.0 manual 5 speed with about 142,000. Nothing is wrong with the way it runs but I like to do upkeep maintenance BEFORE issues arise. Also, I don't know if I have belt or chain so is there a difference in how long one will last in comparison to the other?

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Old 11-18-2012, 11:37 AM   #2
Knows a couple things...

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The 4.0L has a steel timing chain that is good at least until the engine requires a major overhaul. Even then it is only replaced if it has stretched. Only the newer 2.4L and 3.7L engines use rubber timing belts.

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Old 11-18-2012, 11:40 AM   #3
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Thanks for the response. I will cross that off my "to do" list.
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Old 11-18-2012, 06:49 PM   #4

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Yea no real need unless you have problems. Take that money and spend it elsewhere.
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

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Old 11-18-2012, 06:56 PM   #5
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Originally Posted by Jeep Dad View Post
I have a 2002 Wrangler X 4x4 and 4.0 manual 5 speed with about 142,000.
I got bored and replaced the timing set in a 160k 4.0L engine. There was some improvement in low-end performance, but not enough to justify the effort. If had to do it over, I wouldn't bother.
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