1. #1
    Oiltech's Avatar
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    Engine Swap Compatibility

    I recently found a very rusty 1989 Jeep Wrangler with an HO 4.0 Engine. I also own a 1998 Cherokee with a solid body but no oil pressure at idle on a 4.0, HO engine. I was wondering if there are any major differences between the two engines that would make them difficult to swap. I would like to put the 1989 engine into the 1998 Cherokee. Any information would be appreciated.

  2. #2
    98Chero's Avatar
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    Re: Engine Swap Compatibility

    If the only thing wrong with your 98 cherokee is low oil pressure reading at idle I would check and clean or replace your oil pressure sensor. over time they get junk built up in them and will read low to none oil pressure. I have cleaned a few over the years and the oil pressure gauge would start working again. just saying if thats your only problem with the 98 engine.
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    What can I say... I love Jeeps

  3. #3
    mark sr's Avatar
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    Re: Engine Swap Compatibility

    I agree, I used to have a 1990 cherokee with the 4.0 and I had to replace the oil sending unit for that very reason.

  4. #4
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    k-2
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    Re: Engine Swap Compatibility

    I agree with others - do not condemn just for low pressure -

    so much easier to address than a eng swap...

    step 1 put a mechanical gauge on eng to confirm pressure -often a loaner tool.


    an old 4.0L, at idle, HOT, poor oil, shitty filter, hi ambient will have single digit pressure. scary but we can work this

  5. #5
    superj's Avatar
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    Re: Engine Swap Compatibility

    And if it ends up having low/no oil pressure, just drop the pan and put a new pump.
    no more jeeps at this time. next time it will be a cj with a v8

  6. #6
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    Re: Engine Swap Compatibility

    Can some one please tell me off a 1993 engine will go in and work a1999 that are both Cherokees

  7. #7
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    Re: Engine Swap Compatibility

    Quote Originally Posted by Oiltech View Post
    I recently found a very rusty 1989 Jeep Wrangler with an HO 4.0 Engine. I also own a 1998 Cherokee with a solid body but no oil pressure at idle on a 4.0, HO engine. I was wondering if there are any major differences between the two engines that would make them difficult to swap. I would like to put the 1989 engine into the 1998 Cherokee. Any information would be appreciated.
    first thing you need to consider your looking at a 10yr difference that said you would need to do a few modifications to make it fit eng mounts located in different spots ,
    another consideration is you will be required to bring up the emissions standards from the 89 to the 98 that can get costly . not everything will swap over simple , some modifications will be required the dist will be one of those modifications.
    ALL I OWN ARE JEEPS!

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    Re: Engine Swap Compatibility

    Quote Originally Posted by Josh1999 View Post
    Can some one please tell me off a 1993 engine will go in and work a1999 that are both Cherokees
    your application would be pretty similar as in post #7
    ALL I OWN ARE JEEPS!

    54CJ3B ,76DJ5RHD , 81DJ5RHD, 88XJ , (It's)93XJRHD(Alive), 06KJ ,

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