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Thread: 1984 CJ7 Needs a Replacement Engine

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    1984 CJ7 Needs a Replacement Engine

    Hello Yall,
    I just bought a 1984 Jeep CJ7 with a 2.46L 4 cylinder engine, and a 4-speed standard transmission. After driving it for 1/2 mile it died on me and I found out it had a cracked engine block. Now I am looking for a 4.0 six cylinder to replace the 4 cylinder engine. Here are my questions:

    1- Does anyone know which 4.0 year models would be compatible with my Jeep?
    2- Does anyone know where I can get a used one?

    Thank you

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    PondSkum's Avatar
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    1984 CJ7 Needs a Replacement Engine

    Firstly, welcome to TX4WD!

    I've moved your post to the tech section of the forum. The forum you posted in is for official TX4WD organization related discussion.

    That said. I don't know that any 4.0L are directly compatible, but I'm sure you can find adapters and such to mount it in there no problem. Pretty much all year model 4.0's are the same except the later ones replaced the distributor with coil packs.

    Sorry I cannot be of more help, but hopefully someone will chime in with more helpful info. I do not know where to buy one, Craigslist may be a starting point.
    Good luck with the replacement!
    2001 TJ - PondSkum
    Build in progress....

    "The wisest mind has something yet to learn." ~ George Santayana

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    05X4X4 is offline Chapter Safety Officer Bryan/College Station Chapter
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    1984 CJ7 Needs a Replacement Engine

    I have no useful information for you, expect for welcome aboard!


    Sent from my iPhone4 using Tapatalk

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    EastTxRedneck's Avatar
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    go look on pirate 4x4 forum, im sure you can find all the info you need on there, only thing I can add is to make sure its an early obd1 4.0 like out of a very early xj or something so you don't have to deal with all the computer stuff

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    m1009krawler's Avatar
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    Welcome to the club!

    Just a thought to throw out there...

    Have you looked into a small block v8?

    Those are plentiful, rather cheap as I don't see it costing any more than the straight 6, easy to work on, and plenty info out there on how to drop one in a CJ. A little 305 or 350 would go well with that 84 If you don't plan on wheeling it a carb will make everything cheaper and much more simple as well! No brainbox to deal with!

    Let us know how your search goes, plenty on here will would love to see the progress of the build!

    Thanks,
    Alex
    Last edited by m1009krawler; 06-06-2014 at 08:47 AM. Reason: typo

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    Mudhog1977's Avatar
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    I have a 350 in my yj and there is plenty of room to work on it, plus it has lots of giddy up and go lol
    Live to ride, Ride to live ,That's how I roll

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    texasfrog's Avatar
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    don't over look the 4.3 Chevy V6. Runs cooler than the V8 and weighs less.plus you can find more of them in the wrecking yards these days than the SBC.
    -----------------------------------------------------------------------
    "Just because someone goes fast doesn't mean you should do whatever you think they did.
    This path assumes they knew what they were doing, which isn't necessarily the case. Take this path and you will be guaranteed second place."

    Originally Posted by PondSkum
    I'm just a floater.

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    EastTxRedneck's Avatar
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    I second the 4.3 as long as you go pre-vortech and get the tbi one, they are plenty strong and dependable

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    texasfrog's Avatar
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    Quote Originally Posted by EastTxRedneck View Post
    I second the 4.3 as long as you go pre-vortech and get the tbi one, they are plenty strong and dependable
    or swap out the intake and distributor. my favorite set up is a duel fuel propane/ gas set- up.
    -----------------------------------------------------------------------
    "Just because someone goes fast doesn't mean you should do whatever you think they did.
    This path assumes they knew what they were doing, which isn't necessarily the case. Take this path and you will be guaranteed second place."

    Originally Posted by PondSkum
    I'm just a floater.

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    Mudhog1977's Avatar
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    How does that dual fuel setup work?
    Live to ride, Ride to live ,That's how I roll

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