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Unread 05-20-2015, 10:01 PM   #1
Newcardude
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All inline 6 made equal?

I've been reading a lot about how great the jeep Cherokee inline 6s were/are. The grand Cherokee of 2003 and 2004 would fit my (wife's) needs better than an older Cherokee. Could I expect the same great things from a grand Cherokee?

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Unread 05-20-2015, 10:15 PM   #2
mr312712
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Sorry your not talking about a V8.
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Unread 05-20-2015, 10:42 PM   #3
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Somebody say V8?

But really, IMO 4.0 is one of the best, most solid, easy to work on engines made in XJ, ZJ or WJ (minus lifter tick). Go for it
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Unread 05-21-2015, 03:24 AM   #4
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Originally Posted by Newcardude View Post
I've been reading a lot about how great the jeep Cherokee inline 6s were/are. The grand Cherokee of 2003 and 2004 would fit my (wife's) needs better than an older Cherokee. Could I expect the same great things from a grand Cherokee?
What?
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Unread 05-21-2015, 04:52 AM   #5
alfaitalia
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Originally Posted by 99WJ539918 View Post
What?
I agree......OP, grammatically that made next to no sense whatsoever! Try again!
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Unread 05-21-2015, 05:44 AM   #6
cNagy
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I'm thinking he's asking if the 4.0s in the wjs are just as good as the 4.0s in the xjs.
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Unread 05-21-2015, 06:35 AM   #7
Thedawgshow
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Yes, inline engines are great engines. Not just the 4.0L. Dodge had an old slant 6 that was bullet proof and Ford made the old 4.9L 300C.I. inline 6 that was a 400K mile engine too. Of course Honda and Toyota 4 cylinders are inline engines and are known for longevity also. It is the design of being inline that is part of the secret. The engine does not work against itself as in a v engine. Of course the old inline 6 engines are not as efficient as engines are today with MPG and horse power too, but they are long lived engines when taken care of and serviced well.
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Unread 05-21-2015, 07:51 AM   #8
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Quote:
Originally Posted by Newcardude View Post
I've been reading a lot about how great the jeep Cherokee inline 6s were/are. The grand Cherokee of 2003 and 2004 would fit my (wife's) needs better than an older Cherokee. Could I expect the same great things from a grand Cherokee?
Nope.

The later 4.0's had some issues stemming from changes made to the engine around '99 in order to meet stricter emissions requirements.

The two biggest issues are the earlier ('99-'01) 4.0's like to crack the cylinder head when over heated (or sometimes at random) and the piston skirts that like to divorce themselves from the rest of the piston, again completely at random.

So no, IMO, the last generation of the venerable 4.0 doesn't quite live up to same legacy of the previous iterations of the engine.

That's not to say that you'll ever have issues with one, as some guys go 200k before something happens, however there have been broken piston skirts reported as low as 110k miles.
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Unread 05-21-2015, 09:06 AM   #9
Newcardude
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Sorry for the unclear post. Thanks to those who deciphered my message and responded. Lots of helpful info and quick too. Very active board apparently. Thanks again!
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Unread 05-21-2015, 06:20 PM   #10
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Originally Posted by Jeeples View Post
Nope.

The later 4.0's had some issues stemming from changes made to the engine around '99 in order to meet stricter emissions requirements.

The two biggest issues are the earlier ('99-'01) 4.0's like to crack the cylinder head when over heated (or sometimes at random) and the piston skirts that like to divorce themselves from the rest of the piston, again completely at random.

So no, IMO, the last generation of the venerable 4.0 doesn't quite live up to same legacy of the previous iterations of the engine.

That's not to say that you'll ever have issues with one, as some guys go 200k before something happens, however there have been broken piston skirts reported as low as 110k miles.
This. 99 and up arent as reliable as the older ones
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Unread 05-21-2015, 07:27 PM   #11
ChrisHager
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Originally Posted by Jeeples View Post
That's not to say that you'll ever have issues with one, as some guys go 200k before something happens, however there have been broken piston skirts reported as low as 110k miles.
Or in my case, a ground lifter and camshaft at around 80k. It was a fluke, I know, but things happen no matter what the engine.
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Unread 05-21-2015, 08:45 PM   #12
losttech
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The 02-04 have less issues with the 4.0 engine so go for one of those if you want a WJ in a inline 6.
I have a 4.0 2000 year and its been a great rig plenty of power for my needs but everyone has their preference.
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Unread 05-22-2015, 02:47 PM   #13
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My vote goes to the Renix being the toughest 4.0 out there.
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Unread 05-22-2015, 03:07 PM   #14
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My vote goes to the Renix being the toughest 4.0 out there.
Renix FTW!!
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