2003 4.0L Engine Replacement - JeepForum.com
  • 1 Post By rfesu
  • 1 Post By helijeeper
LinkBack Thread Tools
post #1 of 5 Old 07-10-2020, 11:05 PM Thread Starter
Registered User
Join Date: Jun 2020
Posts: 1
2003 4.0L Engine Replacement

Hey y'all,

I'm restoring an 03 WJ and I'm currently looking at sourcing a 4.0L engine. I need an opinion on which I should pick as I'm fairly new to the game and this is a big job for me. I've found an 00 TJ 4.0 with 86k miles on her for $450 and I'm fairly certain the head is good on the Cherokee I currently have. My thought process with that is that I can swap the head from my blown engine (probably a spun crank bearing) onto the TJ engine because it had a faulty head on it in that model year. Of course, I could go the junkyard route and spend a day pulling one myself, though my local junkyard doesn't offer any warranty on self - pulled parts. The junkyard route would cost me $200 for an engine that's probably good (little risky). My third option is to rebuild the engine. I've figured out using rock auto that it would cost me roughly $300 to rebuild the engine assuming it is indeed a spun bearing. My problem with rebuilding is that it would take around 10-12 hours and rebuilding is always a pandora's box. Those are my three options currently, I don't know if the TJ engine would be a direct swap either or if it would take heavy mods. I plan to sell this car but I've really fallen in love with it. Thank you so much to anyone who took time out of their day to read this, and it means the difference of what I decide from the advice y'all give.

samuerisym is offline  
Sponsored Links
post #2 of 5 Old 07-11-2020, 07:55 AM
Registered User
Join Date: Feb 2019
Posts: 4
there's no way to rebuild that thing for $300 properly. if you 'spin a crank bearing' usually the lack of oil pressure from that has caused other damage. at the very least you'll want to have some proper machine work done rather than just slapping it together.

if you don't have much experience building engines, a low mileage engine from the wrecker could be more reliable, these engines don't have a lot of failures from factory build, but there's lots of stuff that can go wrong with a diy rebuild.

i'd either:

- buy a rebuilt crate motor from a reputable builder for a couple grand
- buy a wrecker motor and throw it in there
2oldjeeps likes this.
rfesu is offline  
post #3 of 5 Old 07-11-2020, 08:06 AM
Real Jeeps have dents
CJ7-Tim's Avatar
2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 28,367
A good junkyard will have compression test results and a warranty for their used motors. A $300 1/2 rebuild is pointless.

“When the people find that they can vote themselves money, that will herald the end of the Republic.”

- Benjamin Franklin
CJ7-Tim is offline  
post #4 of 5 Old 07-11-2020, 09:13 AM
Registered User
helijeeper's Avatar
Join Date: Dec 2019
Posts: 61
I went the used route. LKQ had a motor for $750. Wish I could find the prices you're seeing.

Either way it came with 6mo 6K mile warranty and I've had no issues with it.

Sent from my SM-N960U using Tapatalk
2oldjeeps likes this.

"Fly Low, Take Chances"

2004 Grand Cherokee Laredo 4.0L Select Trac
helijeeper is offline  
post #5 of 5 Old 07-11-2020, 07:34 PM
Registered User
Golden-Arm's Avatar
Join Date: Apr 2020
Posts: 81

Originally Posted by helijeeper View Post
I went the used route. LKQ had a motor for $750. Wish I could find the prices you're seeing.

Either way it came with 6mo 6K mile warranty and I've had no issues with it.

Sent from my SM-N960U using Tapatalk

we have a u-pull it yard about a mile from here, that has bare engines for $175.00. uncle tony's has an online inventory, so you can see what's in the yard, before you go. find a totaled jeep, snag the engine, and you're only out $177.00 (they have a 2 dollar cover charge, to get in) if it doesn't work. last time i was at the yard, there were a dozen 4.0 engines to choose from.

Uphill Slow, Downhill Fast, Tonnage First, Safety Last!
Golden-Arm is offline  

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome