General maintenance - Jeep Wrangler Forum
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
Old 10-01-2009, 09:20 PM
Thread Starter
Join Date: Nov 2008
Posts: 40
General maintenance

So I did some maintenance on the jeep. Plugs, wires cap,rotor, oil/filter,and air filter. Had a few questions. The plugs were obviously never gaped (about 55-65 thow) The plug closest to the fire wall not sure if its the 1 cylinder or the 6 was really black around the porcelain and the second to last plug from the front looked the same. The rest looked good. Not sure the mileage since the last change.Question is what would cause this.? Also dipstick broke when I was removing the 4th plug guess I was in a hurry, wheres the best place to get a replacement? Also was underneath and noticed the rear diff had some fluid around the bottom, guessing rear main seal??Sorry for the long post just want my baby to last and get here ready for winter.

namsnik is offline   Quote
Old 10-01-2009, 11:24 PM   #2

::WF Administrator::
4Jeepn's Avatar
Join Date: Apr 2005
Location: Florence, KY
Posts: 12,294
Here is a good link for the plugs:
Verrill: Plug Color Chart

As for oil on the rear diff.. not the main seal.. that would be around the back of the engine.. As for the diff.. see if you can slowly tighten up the bolts..Also check the level.. the fluid should be right at or just below the check hole. Check your local auto parts store for the dipstick.. or the dealer.. or if ya have a pick and pull near ya that can be the most fun.


JKU Build Inside: Party Girl
WranglerForum: Youtube Channel

JKUR 2" Rancho Sport - BlackForest Throwback Top - Milestar 315 Patagona Mt's - Outlaw Sheriff Rims - Bushwacker Flat Fenders -
Spicer Parts F/R Diff Covers, Front Drive Shaft - 4340 Alloy Shafts- Metal Cloak Overland Rock w/Flip Step -JCR Transmission Skid- Quadratec LED Headlights- Q9500i winch
4Jeepn is offline   Quote
Old 10-03-2009, 03:58 AM   #3
popa's Avatar
Join Date: Jun 2009
Location: Romania
Posts: 241
Which sould be the correct gapping for the plugs for the 2000 4.0L?
I have bought a set of new plugs (NGK in Mopar box) but I have no clue about the gapping that should have (preferrably in mm).
popa is offline   Quote
Sponsored Links
Old 10-03-2009, 01:12 PM   #4
Join Date: Sep 2009
Posts: 50
Originally Posted by popa View Post
Which sould be the correct gapping for the plugs for the 2000 4.0L?
I have bought a set of new plugs (NGK in Mopar box) but I have no clue about the gapping that should have (preferrably in mm).
The gap should be on a sticker under the hood. On my '02 the sticker is on the underside of the hood itself and says .035"

Namsik commented that his old plugs were never gapped because the gap is now very wide. I just changed my factory installed plugs for the first time at 75K, the gap was very wide but the center electrode was rounded, sure sign the gap had widened due to erosion of the center electrode.

Spark prefers to jump from a nice squared off and smaller diameter electrode but if you decrease the elecrtrode diameter on a standard plug it doesn't last very long. That's the advantage of platinum tips, the tip is necked down to a smaller diameter but the platinum prevents premature wear, best of both worlds. I've ran platinum plugs for over 130,000 miles and they still look good.
Wind_Rocker 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
newbie seeks walk-through on routine maintenance procedures retiring2texas TJ General Discussion Forum 20 01-15-2011 10:35 PM
JK maintenance.. Timberman JK General Discussion Forum 19 10-31-2009 11:22 AM
60k maintenance ruckus TJ General Discussion Forum 2 10-31-2007 03:09 PM
Resetting maintenance indicator light after changing O2 sensors? ironmonk TJ Tech Forum 7 10-16-2007 08:52 PM
Just plain help in general... FirefighterJR TJ General Discussion Forum 6 01-27-2007 12:00 AM

All times are GMT -5. The time now is 07:56 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC. is not in any way associated with FCA US LLC.