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?

The ULTIMATE "Selectable" Locker System! BroughRough Country Lift Kits and Parts!Introducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Unread 10-10-2012, 12:01 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
Unread 10-10-2012, 01:16 AM   #2
Follow me
1994 YJ Wrangler 
Join Date: Aug 2009
Location: Ripon, California
Posts: 19,224
Depends on how good you are at finding bargains and haggling
Luck Favours The Prepared
Anticanman is offline   Reply With Quote
Unread 10-10-2012, 09:56 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
Unread 10-10-2012, 11:09 AM   #4
Wild Wheeler
jokerchief462's Avatar
1989 YJ Wrangler 
Join Date: Nov 2010
Location: Sin City, Nevada
Posts: 2,839
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
Unread 10-10-2012, 11:11 AM   #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

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.