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Thread: Radiator drain plug is leaking

  1. #1

    Default Radiator drain plug is leaking

    Hey guys the radiator drain plug on my 5.9 is leaking after i chaneghd the fluid last night. I saw a decent sized puddle under the Jeep and took a peak and sure enough its dripping, and its going at a pace like drip.....drip....drip. I tried to tighten it some more but it wont budge its as tight as it goes without breaking it.

    How do you fix this ? Its dripping out of the little hole the fluid drains out off, the actually plug is fine, but the hole is leaking. Im guessing maybe the seal is leaking ?

    Is this the same plug thats on the 5.9's radiator ? The head looks the same so im guessing it is, how do you take the old plug out ? Do you just unscrew it all the way and pull it out or does it unscrew all the way out ?

    http://shop.advanceautoparts.com/web...___#fragment-3
    Last edited by candymancan; 11-19-2010 at 11:21 AM.

  2. #2

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    I believe the whole assembly unscrews out. I had one leak a while back on another vehicle and I removed it and soldered the hole and put it back with no leak. Check at a radiator shop to see if they have a replacement so you can make sure it will unscrew.

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    Quote Originally Posted by candymancan View Post
    how do you take the old plug out ? Do you just unscrew it all the way and pull it out or does it unscrew all the way out ?
    Pull while turning counter-clockwise and it will twist out. It will come completely out. You might even be able to just replace the O-ring on it if you can find one. It goes in by pushing in and turning clockwise until it bottoms out.

  4. #4

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    That part you're looking for is the radiator petcock. Take it off, put in your pocket, go to the parts store then say your petcock is dripping and need the rubber thing that goes on it. If they look confused, say its in my pants, let me pull it out to show you.

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    I had the same problem on my 98 ZJ 4.0. I devised a tube, sealed one end of it w/ silicone/RTV, let it dry in the tube, and slipped it over the drain. Leak stopped.

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    Quote Originally Posted by twojeeps View Post
    That part you're looking for is the radiator petcock. Take it off, put in your pocket, go to the parts store then say your petcock is dripping and need the rubber thing that goes on it. If they look confused, say its in my pants, let me pull it out to show you.
    ROTFL Very funny!

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    Registered louc's Avatar
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    I tole ya those things leak when you loosen em to replace the coolant, always replace with a new one....
    Lou C

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    Better off not messing with plastic drain plugs period.



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    Or brass ones either. That's why, in the future, remove the lower hose instead.

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    Or brass ones either. That's why, in the future, remove the lower hose instead. You ought to be able to just replace it w/ a new one.

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    Quote Originally Posted by Zeppelin View Post
    Pull while turning counter-clockwise and it will twist out. It will come completely out. You might even be able to just replace the O-ring on it if you can find one. It goes in by pushing in and turning clockwise until it bottoms out.
    This.

    It's just the O-ring that's gone bad. Either go to the hardware store and get an O-ring that fits or get the whole plug for $3. It twists out with a quarter turn and it will pull straight out.
    5.9 ZJ SCT tuned PCM/ KJK CAI/ Thorley headers with 3" Magnaflow cat and muffler/ Modded kegger/ TransGo shift kit/ Vanco brake kit/ Braided steel brake lines/ Mopar cupholder insert!

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    Plastic rad ends and plastic drain cocks are not like the old metal and brass ones thread in. As mentioned already, pull the lower rad hose its easier. A lot of those drains are harder to get at and usually leak after they are moved. Don't use them.

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    Quote Originally Posted by twojeeps View Post
    That part you're looking for is the radiator petcock. Take it off, put in your pocket, go to the parts store then say your petcock is dripping and need the rubber thing that goes on it. If they look confused, say its in my pants, let me pull it out to show you.
    Bryan in VA
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    Quote Originally Posted by Chris142 View Post
    Better off not messing with plastic drain plugs period.
    Dude!
    thats one rough looking business card!
    Bryan in VA
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    ^^^^^^^^^^^^^^^^^^^^^^^^
    "What did we really accomplish in IRAQ"

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    Yup, but the kids gotta learn.


    Quote Originally Posted by Chris142 View Post
    Better off not messing with plastic drain plugs period.

  16. #16

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    Ok took the old one out the threads looked messed up, and the o ring was torn in half. Has the crystler stamp on it so its the original im guessing probably why it was so hard to undue in the first place. Poped the new one in and its easy to unscrew and screw in unlike the older one. Doesnt leak anymore.

    Thanks. Btw before i flushed the system the lower radiator hose was so far inside i couldnt even get my hand in let alone a a pair of pliers to undue the clamp. Which lower hose are you talking about now, the one connected to the block or the radiator for future refrences

  17. #17
    the logical one fixer5000's Avatar
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    the radiator of course!! its lower than the block inlet so if your gonna drain thats the one to use
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