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Unread 09-25-2013, 10:30 AM   #1
desertratXj
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rebuild or not to rebuild

i have a 1997 jeep Cherokee sport with a 258 4.0 motor. the vehicle has 165,000 miles and im wondering if i should have the motor rebuilt or not. can anyone help me out and maybe give me some advice on choosing a shop to take it too.

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Unread 09-25-2013, 10:34 AM   #2
dundee23
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does it run good ? and have good compression ? no need to waste money if its not broken.
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Unread 09-25-2013, 11:05 AM   #3
CJ7-Tim
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Wondering why you think the motor needs rebuilding ?
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Unread 09-25-2013, 01:09 PM   #4
chris87xj
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It's just getting good and broken in.
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Unread 09-25-2013, 02:56 PM   #5
desertratXj
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the kid that had it before me didn't take good care of it how2 far will these motors go before they need rebuilding?
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Unread 09-25-2013, 02:57 PM   #6
desertratXj
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it runs good has some torque and power too it is there anything i can do to upgrade the engine or performance without taking out the motor itself
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Unread 09-25-2013, 04:08 PM   #7
mschi772
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Expect AT LEAST 200k miles from a 4.0 that is even remotely cared for. Many hit 300k, and I know of at least one that has gone over 600k. For many of your questions, familiarize yourself with JeepForum and/or Google. The XJ has been around a long time; most things have already been covered quite well.
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Unread 09-26-2013, 08:29 AM   #8
dundee23
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^^^^^^^^^^^^^^^^^^
How long they last depends on how you maintain everything from now on. Enjoy
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Unread 09-28-2013, 12:57 PM   #9
AGDubyaJ
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Originally Posted by desertratXj View Post
how far will these motors go before they need rebuilding?
the 4.0L is simply one of (if not "the") most bulletproof engine ever made, Ive been through 2 XJs, a WJ, and a ZJ- all 4.0s. NEVER had any issues with engine itself, the body, suspension, and/ or transmissions always fall apart long before the 4.0L does.

dont even think of rebuilding the motor unless its knocking or has low compression, low oil pressure due to worn bearing/ seals... even then, it should keep running for a while.
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Unread 09-30-2013, 10:18 PM   #10
desertratXj
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thanks guys its my daily driver but im making it off road ready at the moment.
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Unread 10-01-2013, 05:53 AM   #11
cruiser54
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Change the oil. Use good oil filters like Wix or Napa Gold. Shine a light into the oil filler hole and assess how much, if any, sludge is built up in there.

Do a full tune-up including NGK plugs, Belden plug wires, Premium cap and rotor with brass contacts. All available at Napa.

Clean the throttle body and make sure the air filter is in good shape.
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