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Old 01-03-2017, 07:57 AM
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Lightbulb Rebuilt or Re manufactured 4.0L

I own a 2003 Jeep Wrangler Sahara 4.0L with automatic transmission. The vehicle has about 176,000 miles. So far this is the best vehicle I ever owned, tough for the road and my daily commute. As you can see is getting up there in miles and I need to start thinking on the future. The body of the Jeep is in good shape, no rust, no dents. BTW my engine is not smoking or burning oil, the only leak is the rear engine seal (a tiny drop once in a while). I have noticed an intermittent ticking when starting cold. Just recently I had the transmission serviced (regular maintenance).

Just like with everything else, there are good stories and not so good when replacing and/or repairing engines. I will like to know what worked for you or a fellow Jeep owner; to buy re-manufacture, or rebuild the current one.

Thanks!
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Old 01-03-2017, 08:42 AM   #2
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Just my 2 cents....

The first thing I'd say if it's not broken then don't fix it. Seals are pretty easy to replace and that sounds like pretty low miles for a Jeep. Having said that, for what it's worth I had a 350 SBC that came out of an 81 Corvette. I had that built into a 383 Stroker Motor and the Turbo 350 tranny built to match the motor. I did this to put in my YJ. Yeah, yeah overkill right. With hind sight being 20/20 now I wish I'd have just bought a performance crate motor and transmission from JEGS or another well known source. It would've been cheaper in the long run and done the same thing. Sorry for rambling on here but my point is you whether you want to keep your motor stock or kick it up a notch or two anything is possible. Sometimes expensive, but possible. Good luck...Gunny Out!!

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Old 01-03-2017, 08:49 AM   #3
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As Old Gunny said, "If it's not broken..."

When it is time, some things to consider:
1. If you're doing it yourself, rebuilding will be less expensive, and you can install the pieces/parts you want. Will probably be able to source better parts for the same price as reman.
2. If you're paying for a rebuild, it's probably going to be more expensive than reman.
3. Re-manufactured motors usually come with a warranty 12/12,000 or 24/24,000. IMHO, this is worth paying for a reman motor. Crate motors are matched and tested, so you're usually going to get something that works properly right out of the box (or crate).

Hope this helps.
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Old 01-03-2017, 10:14 AM   #4
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Wheel it until it barely makes it onto the trailer!

My buddy had a reman 4.0 put into his XJ, $2100 all said and done. That's including the labor. Point is, they seem pretty cheap.
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Old 01-03-2017, 01:56 PM   #5
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+1 for the "If it ain't broke don't fix it". You are well advised to consider the possibility of needing a motor at sometime in the future. Just keep running what you have for now. You will know when it's time to replace the motor. Start saving now in a jug or bottle and it'll be easier when the time comes.

I would have no problem rebuilding a motor all by myself. I would have to buy a motor hoist and an engine stand. Then spend a couple weeks doing the rebuild.
Take the bare block to the machine shop to be bored along with the crank to be cut.
New cam bearings and possibly a new cam & lifters. Buy oversized pistons & crank bearings and a complete gasket set. Plus, plus, plus.

If the above seems like it isn't worth it, I agree.

I would limp or tow the Jeep to a shop that re-manufactures engines, have them install a re-man engine and provide me with a guarantee. I would have the Jeep back in a few days and be ready to run the daylights out of it again.

Good Luck, L.M.

P.S.....If I had a core, I might be inclined to buy an engine stand and remanufacture it in my spare time just to have it sitting ready to install when the old motor gives up.
I have lots of other things to do, so unless someone gives me a good core it probably won't happen.
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Old 01-04-2017, 12:21 PM   #6
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Go with a crate motor....thermostat stuck closed on mine and my old man cooked it trying to get it home....we went with a Jasper, got the warranty and at 35k on the new motor runs great no issues. The only thing is the engine is the only thing not original to my Jeep...so if your a big OEM guy then you may want to rebuild.
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Old 01-07-2017, 02:23 PM   #7
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Remaned engine

3 years ago my 4.0 was leaking out the rear seal and burning some oil. I bought a manufactured from Napa for $1,400 and change, also replaced the clutch assembly while I had the motor out. Worked on the weekend and had it back on the road on Sunday. With a manufactured engine you get a warranty. That goes a long ways with me. (Just sayin)
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Old 01-08-2017, 01:41 AM   #8
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Have 6000 miles on my reman, no issues. 3 year, unlimited mile warranty. In the small town I got it in, it ran me just over $3k. Expensive, but sometimes that's what happens when you need something within a few days
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Old 01-08-2017, 12:44 PM   #9
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You could find a used one on CL for 2-300 bucks. And if you have a trustworthy rebuild shop and have it done. I had an old 4cyl redone for 1800. A crate with a warranty is good too.I have also heard good things about jasper. Then you'd have it ready when the other one dies.
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Old 01-14-2017, 04:18 PM   #10
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I've got a 4.2 in my 87 yj 247,000 miles original motor I have jasper reman bringing a truck to pick it up Wednesday theyou told me 3000 to make it a 0mile motor only thing that will not be new is the block

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