Looking for common Jeep 4.0 problems - JeepForum.com
 
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post #1 of 6 Old 08-20-2009, 11:22 AM Thread Starter
SkierAtHeart
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Looking for common Jeep 4.0 problems

I have a 95 Jeep Cherokee 4.0 and it has 181,000 miles on it. I would like to try and make it last 250,000 miles I usually put about 12,000-13,000 miles in it a year. Most of my driving is in the winter time, but I do tow a trailer with a raft on it in the warm summer months. I might be getting a snowmobile this year so more towing. I don't do much off roading but dirt roads can be common during the summer months.

I am looking for common problems that I can try and take care of prior to them happening. For instance I just broke a motor mount I did a search and it looks like its a fairly common problem with the 4.0's. Some of the things I have replaced are water pump, thermostat, starter, alternator, and value cover gasket. If you guys can can give me some ideas of things I should change now that would be great.

Thanks

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post #2 of 6 Old 08-20-2009, 11:31 AM
justanotherjpr
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Add transmission cooler, valve cover gasket always leaks at the back of the head. Keep it full of oil and it will last forever.

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post #3 of 6 Old 08-20-2009, 11:56 AM Thread Starter
SkierAtHeart
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Thank you, What about ball joints? A couple of the rubber boots look pretty worn.
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post #4 of 6 Old 08-21-2009, 05:38 PM
tjwalker
It's the crank sensor!
 
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Most guys pocketbooks preclude them from changing stuff out before its time. I'd recommend you do the same; it just makes sense on an economic basis. Most of the problems with the XJ won't leave you on the side of the road. Fix it when it becomes symptomatic.

As for sensors, the one that is a very common failure on the 4.0 is the crankshaft position sensor. "Some" guys replace it strictly as a preventive measure and keep the old one as a spare. They are kind of a PITA to replace, especially on the side of the road or on the trail.

Best recommendation for longevity? Replace ALL fluids regularly. Coolant, oil, tranny, differentials. I see guys go nuts all the time with mods, etc and they still have their original tranny fluid in there at 75k. Fluids are the lifeblood of your XJ.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #5 of 6 Old 08-21-2009, 05:47 PM
cornbrizzle
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Originally Posted by SkierAtHeart View Post
Thank you, What about ball joints? A couple of the rubber boots look pretty worn.
If there's no play in them just keep them greased real good and they should be fine

Brizzle

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post #6 of 6 Old 08-21-2009, 08:03 PM
loneeagle78
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the main leak I have been replacing up here in ND lately has been the trans/transfer case seals. the seal at the back of the trans starts leaking and it comes out between the two. the other is make sure your rear diff is always full. rear axle seals are another problem area.
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