You will not need to change a timing chain unless you know or suspect it to be bad. Belts and other material that wear down need to be changed but the timing chain itself is a metal similar to that of a bike chain but much shorter and thicker
SOURCE: I have a Jeep Grand Cherokee with 141K miles on
Depending upon which engine you have and how hard you run it and how often it's serviced (and what kind of oil you use) Most chains will go about 160-180 thousand miles before they stretch enough to put the valve timing out of phase enough to be very noticeable. I don't remember if Jeep ever used a nylon toothed cam gear except for the older ones with GM v6 engines. If you don't have a nylon gear, I have never seen a chain actually break, usually after it stretches, it rides up on the gear teeth and shears them off. That won't happen with a steel gear.(Check with dealer parts dept...they should know what is in there) Therefore, it's likely that either way you have about twenty thousand miles left before you need to worry much about it.
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That's what I thought. A local mechanic was trying to tell me that the BELT needed changing at 75K miles. Since I knew that car had a CHAIN (not a belt) I figured I was about to get ripped off...and declined the suggested repair. THANK YOU for your assistance.
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