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Old 06-30-2013, 09:58 PM   #1
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4.0 L timing chain life

on a well maintained 4.0 L straight six-what would be expected life (miles) +/- for the origional timing chain and gears?.

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Old 06-30-2013, 10:16 PM   #2
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Timing chain will just about always out live the engine.

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Old 06-30-2013, 10:28 PM   #3
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If you're inside the engine the FSM states no more than 1/2" deflection else wise replace the chain
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Old 07-01-2013, 09:16 AM   #4
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Don't confuse the 2.5L and 4.0L engine steel timing chains with rubber timing belts used on some newer engines. The steel timing chains used in the 2.5L and 4.0L engine are usually good at least until the engine needs an overhaul.
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Old 07-01-2013, 05:39 PM   #5
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My '92 has over 250K on the original chain.
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Old 07-01-2013, 05:48 PM   #6
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Timing chain will just about always out live the engine.
On an interference engine, i'd expect the two to be VERY close. i.e. the engine will probably live about 20 seconds longer than the chain...
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Old 07-01-2013, 07:06 PM   #7
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On an interference engine, i'd expect the two to be VERY close. i.e. the engine will probably live about 20 seconds longer than the chain...
Neither the 2.5L nor the 4.0L is an interference design engine.
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Old 07-01-2013, 07:12 PM   #8
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Old 07-02-2013, 12:17 PM   #9
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I hear they should last the life of the engine I hear 250K also

My questions is why do the new cars use the rubber timing belts?? I had a Dodge Neon years ago and the belt popped on me on the highway.....
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Old 07-02-2013, 01:03 PM   #10
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I hear they should last the life of the engine I hear 250K also

My questions is why do the new cars use the rubber timing belts?? I had a Dodge Neon years ago and the belt popped on me on the highway.....

Just a guess, but cheaper for rubber belt and gets you into the stealership for maintenance. The belt on my VR4 gets changed every 60k, the '02 Honda we owned I think it was at 120k. Local stealership had 'deals' from time to time on timing belt changes that ranged from $400-$600 depending on your particular Honda. I do my own, but after working on mostly small block Chevy's, I wish they were all chains. Like its been said, last forever.
Hell, maybe with todays throw away motors, the chain was too heavy and wore out components to fast
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Old 07-02-2013, 02:16 PM   #11
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No offense guys, but nearly all of you are wrong.

You do not know who, under what circumstances installed or even manufactured your chain when your jeep was built. It SHOULD last the life of the engine but that is not even close to always the case.

I'm at 107k with chain slap on my very well maintained 4.0. If it makes noise then chances are it is out of spec. If your engine purrs and runs fine then chances are it is not an issue.
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Old 07-02-2013, 02:25 PM   #12
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Pointing out that there are exceptions & saying "nearly all of" us were wrong by not including exceptions reminds me of lawyers who can take a simple statement & turn it into a 10 page document full of warnings and exceptions. So OF COURSE there can be exceptions, no kidding.

The fact that steel timing chains typically last the life of the 2.5L and 4.0L engines is good enough for most people. Intelligent people already realize there are exceptions to every generally accepted characteristic.
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Old 07-02-2013, 02:35 PM   #13
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Pointing out that there are exceptions & saying "nearly all of" us were wrong by not including exceptions reminds me of lawyers who can take a simple statement & turn it into a 10 page document full of warnings and exceptions. So OF COURSE there can be exceptions, no kidding.

The fact that steel timing chains typically last the life of the 2.5L and 4.0L engines is good enough for most people. Intelligent people already realize there are exceptions to every generally accepted characteristic.
Calm down tough guy. Sure is funny how everybody "knows" this yet this question is popping up more and more often. I work on jeeps and no not nearly all of them last the life of the engine unless that engine doesn't last very long. Way to many variables to make it sound so simple. There is no way to know how long one will last and I'm sure the average guy doesn't take his timing cover off at 200k to check it either. Does that mean its good to go? No it could be out of spec and ready to break and cause more damage at any minute.

I'm an aircraft mechanic so I apologize. Your round a bout, most people said so answer isn't good enough for me so I specified to a more detailed level.

You make it sound like this thread is useless for intelligent people. Guess we know why your here now?
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Old 07-02-2013, 03:52 PM   #14
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Just a guess, but cheaper for rubber belt and gets you into the stealership for maintenance. The belt on my VR4 gets changed every 60k, the '02 Honda we owned I think it was at 120k. Local stealership had 'deals' from time to time on timing belt changes that ranged from $400-$600 depending on your particular Honda. I do my own, but after working on mostly small block Chevy's, I wish they were all chains. Like its been said, last forever.
Hell, maybe with todays throw away motors, the chain was too heavy and wore out components to fast
I thought of that too, getting you to the stealership for maintainance so they can make more money off you.
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Old 07-02-2013, 08:15 PM   #15
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Calm down tough guy. Sure is funny how everybody "knows" this yet this question is popping up more and more often. I work on jeeps and no not nearly all of them last the life of the engine unless that engine doesn't last very long. Way to many variables to make it sound so simple. There is no way to know how long one will last and I'm sure the average guy doesn't take his timing cover off at 200k to check it either. Does that mean its good to go? No it could be out of spec and ready to break and cause more damage at any minute.

I'm an aircraft mechanic so I apologize. Your round a bout, most people said so answer isn't good enough for me so I specified to a more detailed level.

You make it sound like this thread is useless for intelligent people. Guess we know why your here now?
LOL... Not that Jerry needs any help defending himself however it appears to me the only one in this thread sounding like a "tough guy" is you. Let's see, you have been a member for what 2 days max? And now you are "calling out" a well respected member of 8 years with close to 25,000 posts?? Maybe it was not your intention but a the very least it's not a good way to begin as a new member.
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Old 07-02-2013, 08:24 PM   #16
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I can say, my timing chain has never needed to be replaced. over a third of a million on this baby.
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Old 07-02-2013, 08:30 PM   #17
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The timing chain in our 4.0 is a pretty short chain so it should last a very long time with minimal stretch. I work on VW's and those chains do stretch but they are prob 4x longer & not as beefy as our chains.My XJ has 135k on it & my TJ has 145k on it & neither one has any chain "slap",at all.
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Old 07-02-2013, 08:32 PM   #18
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AND,Id believe Jerrys word over an awful lot of other people who "claim" to know Jeeps.Lets play nice now.group hug
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Old 07-02-2013, 08:51 PM   #19
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My 97 Jep has 250,000 no sign of chain issues.

As a former mechanic, we use to see Detroit V8's in fairly often with under 100,000 needing timing chains.

There are few cars today with overhead valves, most have overhead cams and either long chains with tensioners or timing belts.

Many belt cars have compared to a Jeep a short cam belt life. One of mine wants it changed every 3 years with no mention of how many miles
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Old 07-02-2013, 09:49 PM   #20
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Guys, sorry to 'disrespect' your leader. I refuse to accept someone's opinion due to post count...

With keeping contact with dealership workers and working on jeeps myself I have contact with more than just my personal jeep where as some of these people are spreading the word that these chains last forever because there's did and Bubba said so..

Truth is, more and more jeeps are getting these replaced by dealerships lately and it tends to be later model tjs.

I expressed my view and experience to help new jeep owners who might easily believe 'aw hell they last forever' and then they think the ticking noise they hear is something it might not be.

Be a little more open minded fellas..
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Old 07-02-2013, 10:01 PM   #21
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Guys, sorry to 'disrespect' your leader. I refuse to accept someone's opinion due to post count...

With keeping contact with dealership workers and working on jeeps myself I have contact with more than just my personal jeep where as some of these people are spreading the word that these chains last forever because there's did and Bubba said so..

Truth is, more and more jeeps are getting these replaced by dealerships lately and it tends to be later model tjs.

I expressed my view and experience to help new jeep owners who might easily believe 'aw hell they last forever' and then they think the ticking noise they hear is something it might not be.

Be a little more open minded fellas..
Exactly how many timing chains have worn to the point of needing replacement that you personally know of?
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Old 07-02-2013, 10:04 PM   #22
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Originally Posted by BustedKnuckle View Post
Guys, sorry to 'disrespect' your leader. I refuse to accept someone's opinion due to post count...

With keeping contact with dealership workers and working on jeeps myself I have contact with more than just my personal jeep where as some of these people are spreading the word that these chains last forever because there's did and Bubba said so..

Truth is, more and more jeeps are getting these replaced by dealerships lately and it tends to be later model tjs.

I expressed my view and experience to help new jeep owners who might easily believe 'aw hell they last forever' and then they think the ticking noise they hear is something it might not be.

Be a little more open minded fellas..
The only person who used the word "forever" is you. Don't put words in peoples mouths they never said or exaggerate what was said. The most anyone estimated here was 250k miles with one more individual mentioning over 300k miles of use on his... so no one is claiming anywhere near "forever" on steel timing chains.

And your stated qualifications of "Keeping in contact with Jeep dealers and working on Jeeps" are no different than half the people on the various forums... which makes you no expert.
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Old 07-02-2013, 10:13 PM   #23
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Old 07-02-2013, 10:41 PM   #24
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Lol life of the engine, forever. Sorry, seemed like an appropriate word to use.

And the fact that I know of more than I can count, one being my own, qualifies me to not jump on the because I heard so bandwagon.

I'm sorry it upsets you to be told that these chains are very capable of wearing out well before the engine internals.

On with the swingin' folks. 4.0 chains do not wear out. Questioning this is stupid. End thread.
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Old 07-02-2013, 11:36 PM   #25
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In all the years I've owned internal combustion engine vehicles I've been more concerned about oil consumption, valve jobs, carburation, overheating, and electrical issues and the like, way more than timing belts/chains. The only exceptions were my kids Honda cars that, at the time needed replacing (along with the water pumps for convenience) every 60,000 miles.

That someone with Jerry's track record and experience with Jeeps suggests that the timing chain in my TJ is going to probably last longer than I may drive my TJ is not only comforting to me but reassuring. I respect that opinion over wannabe "experts" who obviously have yet to walk a mile in B
Jerry's shoes or ridden a mile in his Jeep. There's always people who try to trump experience and knowledge with opinion and hearsay. IMHO.
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Old 07-03-2013, 12:14 AM   #26
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I think you got it reversed? Does Jerry work on them for a living or is he (obviously) a forum wizard who hears the 'hearsay'? And your awful new here to already be in the posse Lol.

Not sure how to say it any more simple than I know of them going bad, first hand including my current ride.

Keep on swinging between his legs is all I can say. Simply put, CHECK YOUR TIMING CHAIN IF iT RATTLES. Despite Jerry the jeep fairy saying its going to last for x amount the truth is they've went out as early as to be covered under warranty and lasted as long as 3 and 400k mile engines. It's MECHANICAL and therefore VARIABLE.

If someone makes you feel better by having half a million posts and saying your jeep is good to go, by all means, sleep good to tonight.
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Old 07-03-2013, 01:00 AM   #27
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I think you got it reversed? Does Jerry work on them for a living or is he (obviously) a forum wizard who hears the 'hearsay'? And your awful new here to already be in the posse Lol.

Not sure how to say it any more simple than I know of them going bad, first hand including my current ride.

Keep on swinging between his legs is all I can say. Simply put, CHECK YOUR TIMING CHAIN IF iT RATTLES. Despite Jerry the jeep fairy saying its going to last for x amount the truth is they've went out as early as to be covered under warranty and lasted as long as 3 and 400k mile engines. It's MECHANICAL and therefore VARIABLE.

If someone makes you feel better by having half a million posts and saying your jeep is good to go, by all means, sleep good to tonight.
We all know timing chains can go at any time, its a mechanical piece that can fail. All anyone one was saying that generally the timing chain will last the life of the motor. Dont come in here with 16 posts and trying to start flexin yer pretty muscles acting like yer king shit to jeep mechanics. These are all posts from guys stating their experiences. DONT BE A DICK
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Old 07-03-2013, 01:13 AM   #28
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Ohh, airplane grease monkey. That expains everything.
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Old 07-03-2013, 01:13 AM   #29
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Look I don't smoke every bowl Jerry packs, but I'm not about smoke a 2 day old newb's bowl with some 'jeep dealership contact' over a timing chain. Hell, my non tupy head that's supposedly prone to crack is still kicking with almost 200k. All mechanics are subject to fail under the right conditions, but the fact is you're not going to find a ton threads here on timing chain failure.
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Old 07-03-2013, 01:16 AM   #30
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Look I don't smoke every bowl Jerry packs, but I'm not about smoke a 2 day old newb's bowl with some 'jeep dealership contact' over a timing chain. Hell, my non tupy head that's supposedly prone to crack is still kicking with almost 200k. All mechanics are subject to fail under the right conditions, but the fact is you're not going to find a ton threads here on timing chain failure.
I just said that, the dude is being an effing tool. Hes an airplane mechanic so it explains alot. You have to be somewhat ocd and narcissistic to be able to work on those.

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