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Old 03-23-2011, 02:28 PM   #1
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Dead Engine, what now? 4cyl vs 6cyl

Hey guys,
I bought my first Jeep a few months ago and have been thrilled everyday since... That is until last week when what my mechanic thought was the timing belt turned out to be the engine being bad. This past weekend my engine finally died on the road (right after I was on the trail, conveniently). Now I'm just not sure where to go from here.
Of all the local salvage yards around the area only one has a 4cyl engine like my current Jeep. There's three or four others that have 6cyl engines. How much of a hassle is it to switch from a 4cyl to a 6cyl? Should I boot out the extra money for a 4cyl because there's only one in the area, or just go for the 6cyl?
Any opinions on crate engines or buying from Ebay?
What other Jeep years would fit my engine?
I'm extremely lost and an opinion or input is greatly appreciated.

Jeep Specs:
TJ 1998
4cyl 4wd
Manual transmission

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Old 03-23-2011, 02:34 PM   #2
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I've seen some very very very cheap used 2.5 liters on eBay and that is personally what I would go for. Just out of curiosity what happened to your engine?

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Old 03-23-2011, 02:37 PM   #3
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if its not a DD i would take my sweet time in figuring it out and get exactly what i wanted. i feel like my I6 lacks power a lot of the time. so maybe something bigger.
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Old 03-23-2011, 02:38 PM   #4
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I-6... same fuel mileage... more torque, more power, better overall performance... go for the 6
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Old 03-23-2011, 02:38 PM   #5
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The mechanic who looked at it said a busted block? I'm not 100% sure, but as soon as it died it wouldn't go anywhere. The day after he towed it in water and oil were mixing in the engine. As to how it got that way... The previous owner was a friend and I bought it knowing he wasn't too good with regular maintenance. Luckily, because it was a friend I'm not getting screwed over (too bad).
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Old 03-23-2011, 02:41 PM   #6
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Yeah, I'm leaning towards the 6cyl too. But I'm just slightly concerned because I asked one mechanic if he'd do that and he flipped out saying it'd be wayyyyy too much work therefore a lot of money.
Just trying to figure out if he told me that because I'm a woman, or what?
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Old 03-23-2011, 02:58 PM   #7
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Quote:
Originally Posted by xyztina View Post
Yeah, I'm leaning towards the 6cyl too. But I'm just slightly concerned because I asked one mechanic if he'd do that and he flipped out saying it'd be wayyyyy too much work therefore a lot of money.
Just trying to figure out if he told me that because I'm a woman, or what?
Im a mechanic too... it would be the same amount of work as switching out the engine for another 4 cyl...

What transmission do you have with it... do you know?
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Old 03-23-2011, 03:04 PM   #8
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Eh. It's a 5 speed stick shift. Past that, I'm not sure. I can get my mechanic friend to investigate more for me if need be?
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Old 03-23-2011, 03:10 PM   #9
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oh nvmnd...i was thinking that the 4 cyl had an option for the AX-15 (5 speed) transmission... but i was wrong... you would have to swap out the tranny which yours seems to be the AX-5 with the AX-15 to be compatible with the 6 cyl...

(this MAY even require a transfer case swap... not too sure)
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Old 03-23-2011, 03:20 PM   #10
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I would go with the 4.0 daily driver

If I were building a toy Id try a 4cylinder
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Old 03-23-2011, 03:26 PM   #11
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The six cylinder swap will need the following
engine
engine wire warness and all controls PCM ect....
AX15 trans
motor mounts

I would stay with the 4 cylinder unless you plan on modifying the jeep. It will be much cheaper. To swap in a 4.0l is very expensive if you have to pay for all of the work to be done.
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Old 03-23-2011, 03:32 PM   #12
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Thats true... I'VE been thinking about it from the standpoint of doing it MYSELF... rather than paying someone too...

What we do in the Lone Star Jeep Club is have wrench a thon's... get friends together to help you do work on your jeep...

so find some friends and buy some pizza and beer!
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Old 03-23-2011, 11:52 PM   #13
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Quote:
Originally Posted by perkalator
The six cylinder swap will need the following
engine
engine wire warness and all controls PCM ect....
AX15 trans
motor mounts

I would stay with the 4 cylinder unless you plan on modifying the jeep. It will be much cheaper. To swap in a 4.0l is very expensive if you have to pay for all of the work to be done.
Thank you for the thorough answer!
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Old 03-24-2011, 05:38 PM   #14
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it would probably be smarter to do the 4 cost wise. seems like if you are going to swap in a 6 then it would be just as much work to do a v8. so if you decide to do a swap i say go for it all out and do a v8.
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Old 03-24-2011, 05:40 PM   #15
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^ good point!
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Old 03-24-2011, 06:10 PM   #16
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Quote:
Originally Posted by xyztina View Post
Yeah, I'm leaning towards the 6cyl too. But I'm just slightly concerned because I asked one mechanic if he'd do that and he flipped out saying it'd be wayyyyy too much work therefore a lot of money.
Just trying to figure out if he told me that because I'm a woman, or what?
if you need to pay labor charges better off sticking to stock unless you have deep pockets( personally i would do a diesel swap but i can do that myself )
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Old 03-24-2011, 06:56 PM   #17
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But will the driveline hold up to a v8
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Old 03-24-2011, 07:52 PM   #18
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But will the driveline hold up to a v8
no but if youve got the coin to do a v8 swap then that should be part of the process.
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Old 03-27-2011, 01:07 PM   #19
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I would definately stay with the 4 banger. I know they aren't very fast but ok for just riding around. Major money for a I6 or V8 swap. The I6 swap alone you would have to have an engine, Ax15 transmission, 23 pline transfer case. You would have to add two wires to your wiring harness and an I6 computer.

The V8 swap would require you change the transmission and transfer case as well as front and rear-ends. I'm Pretty sure your's will have the Dana or Spicer 35 in the rear and 30 in the front. These will not hold up to the newly fitted V8. Unless this is a piddling project an not a daily driver I wouldn't consider an engine upgrade.
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Old 03-27-2011, 09:31 PM   #20
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Im doing a 2.5 to a 4.0 right now, if your doing it yourself i say go for it. its not easy youll need a new transmission, t-case, wiring harness, PCM, radiator, drive shafts, motor mounts, and more ha

for some reason my old drive shafts fit??? so i will be using those, i bought a 23 spline input gear for the t-case.

make sure to do tons of research before you go into it. its a fun challenge i plan on being done in the next week or so. GOODLUCK!
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Old 03-27-2011, 09:42 PM   #21
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If your considering doing the 4 to 6 swap, you may even consider looking for a wrecked I6 jeep and grab the parts you need from that. If you have to time to switch everything out yourself, i'd do it that way. You'd know your jeep inside-out then.
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Old 03-27-2011, 10:57 PM   #22
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Economically, I would just install what it came with, it is what the vin shows, if you would try to sell it in the future, there would be too many questions. if you want the inline 6, just sell your 4cyl and search for a the one you want...

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