Engine Life? - JeepForum.com
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post #1 of 35 Old 06-07-2010, 06:00 PM Thread Starter
Rizzle
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Engine Life?

How many miles should I expect to get out of a 4 cyl and/or the 4.0L engine in a 1997 TJ? Thanks.

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post #2 of 35 Old 06-07-2010, 06:07 PM
TheBoogieman
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200,000 plus if taken care of.
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post #3 of 35 Old 06-07-2010, 07:46 PM
ohtenwillys
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or 50k if you suck water in it.......
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post #4 of 35 Old 06-07-2010, 08:11 PM
moonshinefuel
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300,000^ miles.
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post #5 of 35 Old 06-07-2010, 11:23 PM
TJamz
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I saw a old Cherikee 4.0 w/ 397,000 kilometers (246,000 miles) on it. Still ran and sounded good.
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post #6 of 35 Old 06-07-2010, 11:34 PM
moonshinefuel
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Mine has just over 290,000 miles on the original block/pistons. Still runs fine and sounds good. 2.5 engine.
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post #7 of 35 Old 06-08-2010, 12:12 AM
ek1
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I took a week long driving course and we used cherokees for the off road portion. I've never seen vehicles so badly beaten. They were strictly for off road, that is all the company used them for. The one I was driving had over 290K on it. Never overheated and got me through the 8 hours of off roading. I'm not saying it purred like a kitten, it had it's rattles and pings, but it worked as it should. 4.0's are beasts, do proper maintenance and you'll be fine.
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post #8 of 35 Old 06-08-2010, 12:13 AM
Meep97
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post #9 of 35 Old 06-08-2010, 07:04 AM
Wheelin98TJ
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165k on my 4.0L when a piston skirt broke.

They are tough, but they have their flaws like just about every other motor.

Broken piston skirts and the head casting problems with the 0331 heads seem to be the most common issues. They are still not what I would consider a frequent occurrence, but it does happen to a select few.
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post #10 of 35 Old 06-08-2010, 07:29 AM
Sundowner
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I have a semi-professional opinion on this: a friend of mine and I used to tear down Jeep engines for a local off-road shop. Kind of an after-school job for us. It was easy to see a couple of dozen per week...both 4.0's and the old 4.2's. The conclusion I came to after looking inside these things is that it's almost impossible to kill one of these things under about 200,000 miles...unless you neglect it. Most of the engines that we saw were in the 200,000 to 300,000 mile range, and it wasn't uncommon to see them with more miles than that. Every once in awhile, we'd have one that had somewhere in the range of 400,000 on it, and they were usually still going strong when we pulled them (most of them came from vehicles that had been wrecked).

With that said, however, occasionally we'd come across one that someone had just outright abused. These commonly died under 100,000...just like any other powerplant would have done.

Thus, I'd state with confidence that as long as the maintenance is kept up and the engine taken care of, you should be able to expect a 250,000 mile service life, if not more. Pretty much every bit of anecdotal evidence supports that kind of expectation. I normally don't make these kinds of statements, but when you tear engines down to the bare block for five days a week, you see a lot of their quirks and traits. End result: as one poster said above...these things are beasts. There's a reason the design didn't change in 50 years.

If it's worth doing, then it's worth overdoing.

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post #11 of 35 Old 06-08-2010, 07:37 AM
mdm
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Quote:
Originally Posted by Wheelin98TJ View Post
165k on my 4.0L when a piston skirt broke...
175K on mine when a piston skirt broke.

Keep in mind that free advice can frequently be worth less than you pay for it.
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post #12 of 35 Old 06-08-2010, 08:39 AM
timberwolf0122
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Now are we counting the engines after life when it goes to jeep heaven and becomes a stoker?

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post #13 of 35 Old 09-20-2014, 07:38 PM
Aarce65
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220,000 miles on my 4.0L, it still pulls strong, runs smooth without any leaks or smoke
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post #14 of 35 Old 09-20-2014, 07:50 PM
chris142
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My first Jeep was an 89 yj with the 2.5L. I maintained it well. It ate a cam @66K.I think the flat cam pieces got into the bearings and rings maybe. It became an oil burning and gutless pig soon after i put a new cam and lifters in it. It tossed its lunch @ 99997miles. But for the last year or so I was using thicker and thicker oils trying to keep oil from burning so fast.

I always thought that since it was always working hard that had something to do with its death.

The 4.0 in my 02 does not use any oil @150k on it now. Power does seem down a little, I'm betting on worn injectors in it.
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post #15 of 35 Old 09-20-2014, 08:10 PM
STRATTON
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Quote:
Originally Posted by Sundowner View Post
I have a semi-professional opinion on this: a friend of mine and I used to tear down Jeep engines for a local off-road shop. Kind of an after-school job for us. It was easy to see a couple of dozen per week...both 4.0's and the old 4.2's. The conclusion I came to after looking inside these things is that it's almost impossible to kill one of these things under about 200,000 miles...unless you neglect it. Most of the engines that we saw were in the 200,000 to 300,000 mile range, and it wasn't uncommon to see them with more miles than that. Every once in awhile, we'd have one that had somewhere in the range of 400,000 on it, and they were usually still going strong when we pulled them (most of them came from vehicles that had been wrecked).

With that said, however, occasionally we'd come across one that someone had just outright abused. These commonly died under 100,000...just like any other powerplant would have done.

Thus, I'd state with confidence that as long as the maintenance is kept up and the engine taken care of, you should be able to expect a 250,000 mile service life, if not more. Pretty much every bit of anecdotal evidence supports that kind of expectation. I normally don't make these kinds of statements, but when you tear engines down to the bare block for five days a week, you see a lot of their quirks and traits. End result: as one poster said above...these things are beasts. There's a reason the design didn't change in 50 years.
i agree. i purchased my tj with 155k on it. it just got rod knock with 198k on it. wish it would have went more, i always maintained it, oil every 3500 to 4k with filter, clean air filter. the jeep is in amazing shape, and the motor ran beautifully for the last 43k miles.

i dont know how it was treated previously, but it couldnt have been to bad considering it nearly made 200k. i wheeled it about 10ish times, and i wasnt easy on it, but no means did i beat it down.

so things do happen. im purchasing a new jasper engine, soup to nuts. ill be happy if the jasper lasts as long as the motor its replacing.

i would have went with a golen 4.6 stroker, but it was about 1000 more just for the motor and then about 400 more for injectors. chad golen promised all it needed was injectors, but everything else i read said it needed an adjustable fuel pressure regulator and some other controller to control timing or something.

so a stock replacement is where im at. i would like to add a street cam to it, any suggestions for a 2002 cam with good street characteristics but with some more power all around ?

also im considering adding a banks header into the mix, thoughts on that ? and eventually a full banks exhaust.

i figure, new motor, nice cam, header and exhaust and i already have a k&n cai on it.

sure i wish my motor would have went 300k, but it didnt, i do wish i know why it failed early, beacuse of previous owners ? because of me ? but i will never actually know.

all i do know is i will be a little easier on the new motor, i will wait till it warms up before pulling away from my house, and ill try to avoid the 5th from 3rd wot pulls to pass or block some one on the highway lol. its seen a handfull of redlines in my hands, but what motor hasnt

stratton.
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