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Old 08-05-2009, 10:57 PM   #1
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Timing chains-

I was just reading a thread, and came accross somthing I've been meaning to ask. How long does the "normal" timing chain last in a 4.0? I have an 00 with 120k=purchased from the original owner=and a mall queen. Do they start to slap around like the old days? Or just snap? How many miles? Thanks.

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Old 08-06-2009, 09:29 AM   #2
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The timing chain lasts at least as long as the engine does before the entire engine needs a major overhaul. Only then is the timing chain usually replaced.

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Old 08-06-2009, 10:09 AM   #3
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Do 4.0's have a chain and not a belt. I know thye 4 cyl has a belt that should be changed at 90K. Chains last forever, belts do not and if it is an interference engine when it breaks you get '000's in internal damage.

Check your owners manuak, it will tell you if you need to service it and when.
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Old 08-06-2009, 10:13 AM   #4
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Just checked my 2004 FSM and 4.0's have a chain so as long as you keep the oil clean you will be fine.
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April 2012.downsized and now a 99er.
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Old 08-06-2009, 10:16 AM   #5
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Neither the 2.5L four cylinder nor the 4.0L six cylinder engines have rubber timing belts that need changing before engine overhaul. Both have steel timing chains that don't need changing until the engine needs a complete overhaul, usually well after 250K miles. Here is the steel timing chain for the 2.5L engine you had in your '94 YJ Atthehop... Timing Chain 4 Cylinder 2.5L*3242300
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Old 08-06-2009, 12:00 PM   #6
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Quote:
Originally Posted by Jerry Bransford View Post
Neither the 2.5L four cylinder nor the 4.0L six cylinder engines have rubber timing belts that need changing before engine overhaul. Both have steel timing chains that don't need changing until the engine needs a complete overhaul, usually well after 250K miles. Here is the steel timing chain for the 2.5L engine you had in your '94 YJ Atthehop... Timing Chain 4 Cylinder 2.5L*3242300
I knew my 94 had a chain and my 04 has a belt which I will have to change in a little under 20K more miles. Not looking forward to it but I do not plan to pay someone to do it when I can do it myself.

Thanks for the info.
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Old 08-06-2009, 12:38 PM   #7
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Quote:
Originally Posted by Atthehop View Post
Just checked my 2004 FSM and 4.0's have a chain so as long as you keep the oil clean you will be fine.
Just checking

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