2002 jeep wrangler engine failure - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-08-2011, 10:58 AM   #1
Join Date: Feb 2011
Posts: 2
2002 jeep wrangler engine failure

I own a 2002 jeep wrangler that had an engine failure. it has 67000 mile on it. at the last oil change, i switched to castrol synthetic oil. after about 1000 mile the engine failed. the oil turned to a gum like substance. i have owned the jeep since new, always serviced it faithfully and it has never been in the mud. it is a 4.0 litre. any suggestion.

mcware is offline   Quote
Old 02-08-2011, 12:08 PM   #2
InfernoGirl's Avatar
Join Date: May 2009
Location: Newburgh IN
Posts: 11,419
Pretty sure switching to synthetic is a bad idea on an older vehicle. I think it loosens all the build up and probably is what created the crud. I'm sure others with more knowledge than I will chime in soon. Sorry about your bad luck.


Dirty Mudder column covers|

'01 Wrangler Sport, Sienna Pearl Mine
'07 Rubicon 2D, Flame Red His
'11 Wrangler Sport 4D, Black Ours...

Originally Posted by Kate View Post
Not every girl, is a Jeep girl. We're a special breed.
InfernoGirl is offline   Quote
Old 02-08-2011, 06:43 PM   #3
Join Date: Jan 2010
Posts: 191
I've switched to synthetic in many older engines and never had a problem. If you have been using modern oil and changing it as recommended you just don't have a big build up of gunk to become loosened/dissolved. What "failed" in the engine, exactly? No cracks in block or head or leaky head gasket contaminating the oil with coolant?
KCrisp is offline   Quote
Old 02-08-2011, 07:24 PM   #4
I am JD and it's My Dream

WF Supporting Member
::WF Administrator::
JDsDream's Avatar
Join Date: Jan 2009
Location: The Peach State
Posts: 28,127
My first thought was the head gasket. Is there oil in the coolant or vice-versa? Did it overheat before it failed? Were there no signs that it was about to go?
The kind of woman that when my feet hit the floor each morning the devil says "Oh Crap, She's up!"

To All Of Our Forum Veterans and Active Service Members.
Our Debt To You Is Greater Than We Could Ever Repay.
Thank You

Become a Supporting Member!
JDsDream is online now   Quote
Old 02-08-2011, 07:36 PM   #5
Join Date: Dec 2009
Location: Lake in the Hills, IL
Posts: 611
Who has been doing your oil changes? You or a Goofy Lube type place?
ratuna is offline   Quote
Old 02-08-2011, 08:26 PM   #6
jefferyfghezzi's Avatar
Join Date: Jan 2011
Posts: 659
jefferyfghezzi is offline   Quote
Old 02-09-2011, 10:57 AM   #7
Join Date: Feb 2011
Posts: 2
I wasn't driving, so i will tell you what my wife told me. Driving down the interstate, engine light came on, and then a loud band. No sign of overheating before the failure. Started pulling parts off yesterday, and found a hole in the side of the block. Haven't removed the pan yet, but sounds like a rod came loose. No oil in the radiator or coolant. I changed my oil myself using 10w30 pennsoil, before switching to synthetic.
mcware is offline   Quote
Old 02-09-2011, 03:31 PM   #8
jefferyfghezzi's Avatar
Join Date: Jan 2011
Posts: 659
Sounds like you spun a rod bearing and broke the rod. With only 67,000 miles on the JEEP I would probably look for remanufactured short block. Your crankshaft more than likely is scored. A salvage yard engine is good too,but I wouldn't want more than about 70,000 miles or so on it. Not knowing how it has been maintained I would be tempted to rebuild it just for the peace of mind. If you opt for remanufactured I wouldn"t want 10 or 20 under on the main or rod journals. I have gone 30 over and had no problems on the mains ,but I did have problms on the rod jounals.Thats just me.
jefferyfghezzi is offline   Quote
Old 02-09-2011, 03:34 PM   #9
PTaylor's Avatar
Join Date: Jul 2009
Location: South Carolina
Posts: 782
you can get another engine pretty cheap, just the basic engine, and transfer everything from it to the new engine.

or sell it to me as is....
PTaylor is offline   Quote
Old 02-09-2011, 03:39 PM   #10
Tomb Raider's Avatar
Join Date: Dec 2010
Posts: 96
67k blows! Sorry for the loss! Never had issues with changing to synthetic in all my vehicles, old and older. Having worked in a race engine shop...sometimes things just happen, and specific causes go un found!
Tomb Raider is offline   Quote
Old 02-09-2011, 05:46 PM   #11
Join Date: Dec 2010
Posts: 37
Even used engines aren't cheap

There are so many engine failures that even a used engine will cost $1200 to $1600. I looked everywhere and Advance Auto had the best price. They give a year unlimited mileage warranty on the engine itself. The labor is on you.

2000 Jeep wrangler 4.0 auto Vietnam helicopter pilot, Avid car collector, Fanatic about maintenance.
buckstom 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Jeep Jokes jeeptales Off-Topic 39 07-24-2013 02:14 AM
Runaway Off Topic Thread amerijeep Off-Topic 2723 01-30-2011 08:19 PM
RECALL 2010 Dodge Nitro, Dodge Ram, Jeep Liberty and Jeep Wrangler PTaylor General Jeep Discussion 1 12-15-2010 08:06 PM
1999 jeep wrangler 2.5 sport engine starter daxbike TJ Tech Forum 2 05-19-2010 01:37 PM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 11:52 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

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