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  1. #1
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    Default How to remove 89 jeep 4.0L engine block plug?

    I have a 89 jeep wagoneer limited 4.0l inline six. The plug is located close to the end of the manifold where the flange for the pipe bolts together. I went to motible part stores and had no luck. i asked the jeep dealer ship and like usual they knew nothing. I found the replacement block plug at carquest. its different. The plug in the jeep sinks in and the plug i bought is similar to a bolt you just use a socket. the guy at carquest said to stick a extention in it but it wont fit. i've tried hex bits with no luck. what do i use?





  2. #2
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    Thanks for joining. If no one else has an answer for you soon I'll have a look on my 98. Hopefully it will be the same.

  3. #3
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    I can't tell in that fuzzy pic but I would guess that it is a torx fitting maybe a T 60 or so. I am not familiar with the particular plug you are trying to remove. What is it plugging. Oil or water drain or what. It seems to have a lever built onto it and I have no such plug in my FSM which BTW is for an 89.
    Last edited by BlueXJ; 04-24-2009 at 03:50 PM.

  4. #4
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    Melissa don't you have one of these engines? Can you try and get a better picture?

  5. #5
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    Okay I tried to get a picture, but could not. It's the plug that is right next to these four soft bigger freeze plugs


    I was able to take a 3/8th drive ratchet and it fit right in there.


    Oh, its a screw in fitting (Don't know the actual term) like this one but has the squared shape not the hexagon shape as the one in my picture ( sorry it's fuzzy too)





    What about drilling a hole and useing an easy out?

    This is the best I can do to help out.
    Last edited by Melissa; 04-24-2009 at 06:43 PM.

  6. #6
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    The brass plug your holding is simply a pipe plug. I would guess the plug shown in the OP is a "port" to an oil galley. Just a guess though.

    I think from the OP pic the "lever" looking thing is just a web cast into the block/head.
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  7. #7
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    Quote Originally Posted by firehawk View Post
    The brass plug your holding is simply a pipe plug. I would guess the plug shown in the OP is a "port" to an oil galley. Just a guess though.

    I think from the OP pic the "lever" looking thing is just a web cast into the block/head.
    Don't know my shory hand, what does OP stand for?

    My 3/8 rachet would have undone that particular plug on my motor, but I didn't unscrew it cause I don't know what it's plugging and I was right underneath it at the time

  8. #8
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    OP= Original Poster

    If it is an oil galley plug you would have gotten a face full of oil. Anyone read why he wants to remove it anyway? Is it leaking or is he trying to replace all engine plugs with some nice brass ones or what.

  9. #9
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    i wish my 3/8 rachet would fit. i can't get it to fit in the hole. It is the plug for the coolant in the engine block. it is the block plug for coolant when you flush the system. like i said my 3/8 rachet won't fit. its too big. i've tried hex and torx sockets nothing fits
    Last edited by greenchevy; 04-24-2009 at 08:10 PM.

  10. #10
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    Is it leaking or what? I have never removed mine for any type of coolant flush in the past.

  11. #11
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    What about drilling it and using an easy out?

  12. #12
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    i'am changing the cylinder head and it says to flush the full system and to remove that plug. i bought another one to replace it but i can't get it out.

  13. #13
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    If it is indeed for the cooling system then I would drill it and then use an easy out to remove it. I would not recomend that for an oil passage as you do not want to chance any metel debris in the oil at all.

  14. #14
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    Default Re: how to remove 89 jeep 4.0L engine block plug?

    Did you ever figure it out? I'm having the same problem. My 3/8 just won't fit!

  15. #15
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    Default Re: how to remove 89 jeep 4.0L engine block plug?

    It's some kind of weird size. It's a coolant block drain plug.

    It's the same size a the BA-10 drain and fill plug.

    don't know if it's 5/16 or metric, but considering the BA-10 is French crap it's likely metric. I used a sacrificial extension 3/8" drive and ground down all four sides a bit until it fit, and it fit nicely. That tool has a special place in my toolbox.
    1. 1990 XJ Laredo AW4-4.0L-NP231 D35/D30-OPEN cooling-3.5 full pack-etc.-etc.
    #2. 1988 MJ Pioneer AW4-4.0L-NP231J-D30/D44 LSD - OPEN cooling - 3" lift - 31's

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