Rebuilt or Re manufactured 4.0L - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ General Discussion Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 01-03-2017, 07:57 AM
Thread Starter
JeepPatrol's Avatar
Join Date: Jul 2013
Location: Deltona, FL
Posts: 32
JeepPatrol is on a distinguished road
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.

JeepPatrol is offline   Quote
Old 01-03-2017, 08:42 AM   #2
Join Date: Dec 2012
Location: Coastal North Carolina back to my old stomping grounds near Camp Lejeune!!
Posts: 292
Old Gunny is on a distinguished road
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!!

I never have a Grenade when I need one!!
Old Gunny is offline   Quote
Old 01-03-2017, 08:49 AM   #3
Join Date: Jul 2016
Posts: 93
larkja is on a distinguished road
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.
larkja is offline   Quote
Old 01-03-2017, 10:14 AM   #4
MudMagnetYJ's Avatar
Join Date: Jun 2015
Location: Ohio
Posts: 3,057
MudMagnetYJ is on a distinguished road
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.
Build thread for OJ, my YJ. 1993 Wrangler S 2.5L/AX-5/NP231 with SYE, Spartan locked Dana 30/Aussie locked Ford 8.8 @ 4.88, SOA lift with 2.5" OME HD springs and front Bilstein/rear Rancho shocks, Barricade 9500 winch, custom front and rear bumpers, 136 amp alternator, 35" Super Swamper LTBs.
1999 Ford F-250 Super Duty 7.3L Powerstroke, single turbo, 6 speed manual.
Jeep manuals!
MudMagnetYJ is offline   Quote
Old 01-03-2017, 01:56 PM   #5
Luckymac's Avatar
Join Date: Jan 2014
Location: SouthEast of Denver
Posts: 3,570
Luckymac is on a distinguished road
+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.
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles
HEI distributor with computer and all related relays and wiring removed.
No back seat.
12K Badlands winch with dual batteries.
Luckymac is offline   Quote
Old 01-04-2017, 12:21 PM   #6
sccritterkiller's Avatar
Join Date: Jul 2015
Location: South Carolina
Posts: 620
sccritterkiller is on a distinguished road
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 if your a big OEM guy then you may want to rebuild.
90' YJ 4.2L 5spd, OME 2.5" Lift w/OME shackles, 1" BL, Clifford 6=8 upgrade, Weber 38, HEI, 32 x 11.50 BFG KO2 on Mambas, external slave swap, SWAG tailgate, SYE, sporting a "Woody" DS, 8.8 running 4.10s, Warn Pt 10s
Emissions/Inspection: NO
sccritterkiller is offline   Quote
Old 01-07-2017, 02:23 PM   #7
Join Date: Dec 2016
Location: Crescent City Calif.
Posts: 254
Mule_rider is on a distinguished road
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)
Mule_rider is offline   Quote
Old 01-08-2017, 01:41 AM   #8
Join Date: Mar 2015
Location: JBSA-Lackland, TX
Posts: 119
tacoWrangler is on a distinguished road
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
[1994 Jeep Wrangler SE, 4.0L, 5-Speed]
[2016 Jeep Patriot Latitude, 2.4L, Auto]
tacoWrangler is offline   Quote
Old 01-08-2017, 12:44 PM   #9
JMO69's Avatar
Join Date: Apr 2014
Location: RI
Posts: 490
JMO69 is on a distinguished road
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.
"NO! YOU CAN'T BORROW MY JEEP!" 91 YJ, 4CYL rebuilt bored 30 over, 5spd, Old Man EMU 2.5"lift+1.5"BL,33"Tires,8.8axle,4.88 gears,SYE,Detroit TrueTrac locker, 4.0 throttle body,.Pacesetter ceram.coat headers,banks stainless exhaust, magnaflow cat.
JMO69 is offline   Quote
Old 01-14-2017, 04:18 PM   #10
Greenmachine87's Avatar
Join Date: Jan 2017
Location: Amistad
Posts: 27
Greenmachine87 is on a distinguished road
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

Greenmachine87 is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 09:25 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner