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Old 10-01-2009, 08:20 PM   #1
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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.

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Old 10-01-2009, 10:24 PM   #2
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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.

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Old 10-03-2009, 02:58 AM   #3
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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).
Thanks
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Old 10-03-2009, 12:12 PM   #4
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Quote:
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).
Thanks
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.
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