1. #1
    TerryMason's Avatar
    TerryMason is online now Administrator
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    Six Cylinder 4.0 Liter Jeep engine Specs

    AMC first introduced the inline 4 2.5L engine back in 1980s on the Cherokee model, and Jeep begain using it on the Wrangler YJ in 1991. The 4.0L engine was a vast improvement over the AMC 4.2L engine. This engine is currently used in the Wrangler TJ model
    Last edited by TerryMason; 01-27-2008 at 10:50 AM.

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    TerryMason is online now Administrator
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    Six Cylinder 4.0 Liter Jeep engine Specs- Technical specs

    Displacement243 cubic
    inches
    Cylinder numbers (front
    to rear)
    1-2-3-4-5-6
    Firing order1-5-3-6-2-4
    Spark Plug gap0.033 to
    0.038
    Ignition timing9 to 11
    degrees
    Idle speed (auto)600 +/-
    70 rpm

    (manual)



    680 +/-
    70 rpm
    Engine oilAPI SE of
    SF
    - Oil capacity6qts
    Automatic
    Transmission Fluid
    Mercon
    ATF
    - ATF Capacity4qts

  3. #3
    vuudu's Avatar
    vuudu is offline Junior Member
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    Re: Six Cylinder 4.0 Liter Jeep engine Specs

    Terry, Thank you very much. You have not idea how much you have helped me. I thought, my transmission was the problem after changing my sparks plugs, My Jeep was bought from someone and I think they changed the direction of the distributor cap. After looking at your picture, I finally got it with the position of the screws. Thank you again. Keep doing the great job you are doing.

  4. #4
    jeeper joe's Avatar
    jeeper joe is offline Junior Member
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    Re: Six Cylinder 4.0 Liter Jeep engine Specs

    Does anyone know the torque for head bolts for a 89 6cyl

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