Is it worth rebuilding my 1990 4cyl? -
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Is it worth rebuilding my 1990 4cyl?

BDS 2" Spring lift for 2012-2016 Jeep JKU **Deals at Intimidator grills at JeepHutPANDEMIC-USA 50" SINGLE ROW light bars!! **On sale no

Unread 10-10-2012, 01:01 AM   #1
Registered User
1990 YJ Wrangler 
Join Date: Sep 2012
Location: corpus christi, Tx
Posts: 3
Is it worth rebuilding my 1990 4cyl?

I just bought my first yj with a carb'd 4 cyl and it runs fine but with a tick that ive narrowed down to a worn piston bearing. If i'm going to fix that i mine as well just rebuild from the ground up. Is it worth it or I could upgrade to a 6 cyl which would be more work and a lot more money but better performance. what are some ballpark estimates on how much that costs to do the whole swap?

TurtlemanErnie is offline   Reply With Quote Quick reply to this message
Unread 10-10-2012, 02:16 AM   #2
RIP one good jeeper
Anticanman's Avatar
1994 YJ Wrangler 
Join Date: Aug 2009
Location: Ripon, California
Posts: 20,369
Depends on how good you are at finding bargains and haggling
Luck Favours The Prepared
Anticanman is offline   Reply With Quote Quick reply to this message
Unread 10-10-2012, 10:56 AM   #3
Registered User
1980 CJ5 
Join Date: Jul 2007
Location: pennsylvania
Posts: 678
I did my 4.0 auto swap for nothing, maybe even made a little. but I am cheap and my jeep wasnt my dd so it could sit in the garage for a while. If you like the 2.5 just rebuild it. You can buy a running xj with a 4.0 in it cheaper than rebuilding a 2.5 but its a lot more work putting the 4.0 in.
oteps is offline   Reply With Quote Quick reply to this message
Unread 10-10-2012, 12:09 PM   #4
Registered User
1989 YJ Wrangler 
Join Date: Nov 2010
Location: Sin City, Nevada
Posts: 2,881
2.5 overhaul was $1200 from Nevada Valve Train and odds and ends cost me anothe $400 to complete everything. If I had the opportunity I would do the swap. Go find the donor and get everything lined up for the swap and then program the downtime to swap over. There are a lot of good engines sitting in the yards that can go in there.
jokerchief462 is offline   Reply With Quote Quick reply to this message
Unread 10-10-2012, 12:11 PM   #5
Registered User
1998 XJ Cherokee 
Join Date: Jul 2011
Location: Asheboro, NC
Posts: 903
Swap in a V8. Would be cheaper than rebuild with better performance than 4.0.
My 98 XJ "Zap" Build Thread

1988 Jeep Comanche 4x4 Longbed - POS
Tylerzap is offline   Reply With Quote Quick reply to this message

4 cyl , 6 cyl , rebuild , swap , YJ

Quick Reply

Register Now

In order to be able to post messages on the 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:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. is not in any way associated with Jeep or the Chrysler Corp.