Mystery threaded plug at top of radiator - JeepForum.com
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post #1 of 15 Old 09-20-2021, 10:53 AM Thread Starter
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Mystery threaded plug at top of radiator

Found a coolant leak the other day, turns out that the head of a plastic threaded plug broke off. No idea what that port behind the main cap is even for, maybe some vent tube? Of course the radiator is out of warranty and nobody I talked to knows anything about this part, apparently it's just not available separately. The threads measure 13/16" across.


Anyone end up fixing or replacing one of these before? I'd have to think there's some similar part out there that I could use as a replacement. Gluing it back together just doesn't seem like a good option being right in the middle of the threads. A 3D printer would probably come in handy right about now.

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post #2 of 15 Old 09-20-2021, 11:20 AM
CJ7-Tim
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What kinda car ?


If that is a Jeep, cheap Chinese replacement radiators often have a similar plug. It is not meant to have a use, or to be removed. If you are lucky, you might be able to clean and dry the plug and threads and get some JB Weld epoxy to hold it in place. I would replace the radiator, because if your JB Weld repairs fail, you will likely be far from home and need a tow truck.

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post #3 of 15 Old 09-20-2021, 12:26 PM Thread Starter
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Quote:
Originally Posted by CJ7-Tim View Post
What kinda car ?


If that is a Jeep, cheap Chinese replacement radiators often have a similar plug. It is not meant to have a use, or to be removed. If you are lucky, you might be able to clean and dry the plug and threads and get some JB Weld epoxy to hold it in place. I would replace the radiator, because if your JB Weld repairs fail, you will likely be far from home and need a tow truck.

Hi, it's a '99 WJ.



I am finding it really hard to replace the entire radiator just for some 50 cent pipe plug. I'd rather somehow fill in that whole cavity with glue or something similar. It's a completely useless port so I won't miss it at all.


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post #4 of 15 Old 09-20-2021, 04:00 PM
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When the cheap Chinese radiator in my other XJ Cherokee split open, the engine overheated and seized up just as I got to a safe spot on the side of the road. The tow truck cost $189, and the used engine was $600.

A fresh radiator is cheap insurance compared to that ??

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post #5 of 15 Old 09-20-2021, 04:11 PM
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Looks like a socket head M20-1.5 o-ring plug. Worth a try before ordering a new radiator or jb welding the hole closed


https://www.amazon.com/Moroso-22738-.../dp/B009RL2KGK


o-ringed, so not just a simple pipe plug for 50 cents

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post #6 of 15 Old 09-20-2021, 06:19 PM
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Well unless its a bush fix( JB, even a pipe plug might go in) it would be best to replace the rad.

Where are OEM made today????????????????????? Mexico? Not like the rad they came with is being made by the same people today.......


New jeeps rads dont last well. I would about bet a top end China one would be better then these from mexico today. But you need to spend money to get higher quality.

Like our two trucks. both have the stock rads still today one is 25 year and the other is 18 years. Even have plastic. But i would bet anything the same one new today wont be as good. Unless you go top shelf and NOT OEM.

China makes parts for these new 3.6s that make jeeps OEM look like junk. Main one is that CHINA made all alloy oil cooler assembly. Jeeps one has failed after design changes to no end. Plastic. China one is all alloy. Yes it cost more, but not much and dealers charge more for the OEM then that cHina one.

If not saying buy China, unless 1 no choice, 2 they do it better. I worry about the latter.

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post #7 of 15 Old 09-20-2021, 06:23 PM Thread Starter
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Quote:
Originally Posted by Fourtrail View Post
Looks like a socket head M20-1.5 o-ring plug. Worth a try before ordering a new radiator or jb welding the hole closed

https://www.amazon.com/Moroso-22738-.../dp/B009RL2KGK

Hey that looks pretty close, didn't think to use a metric measurement, makes sense though with it likely being a Chinese unit. Thanks will give that a closer look!


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post #8 of 15 Old 09-26-2021, 02:37 AM
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I’m thinking that a standard pipe plug in brass would be your solution. Take the threaded portion to any Lowes, Home Depot, Tractor Supply, or any auto parts or plumbing house to match up a replacement. Simple fix; no need to R&R the radiator.
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post #9 of 15 Old 09-26-2021, 05:35 AM
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Quote:
Originally Posted by Chardagha View Post
I’m thinking that a standard pipe plug in brass would be your solution. Take the threaded portion to any Lowes, Home Depot, Tractor Supply, or any auto parts or plumbing house to match up a replacement. Simple fix; no need to R&R the radiator.
Probably could work. Since the plug is not meant to be removed you can jigger the threads a bit. Use pipe dope on it to help prevent leaks.

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post #10 of 15 Old 10-04-2021, 02:33 PM Thread Starter
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Originally Posted by Fourtrail View Post
Looks like a socket head M20-1.5 o-ring plug. Worth a try before ordering a new radiator or jb welding the hole closed

Well the M20-1.5 ended up being just a smidge too small. The Dorman part was only $3 though, so was definitely worth a shot.


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post #11 of 15 Old 10-04-2021, 03:01 PM Thread Starter
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The thread pitch on the M20-1.5 is definitely on the mark, so I'll try an M22-1.5 hopefully that should do the trick...


https://www.amazon.com/Dorman-Autogr...dp/B07QQTTF63/


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post #12 of 15 Old 10-04-2021, 03:15 PM
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Originally Posted by salimoneus View Post
The thread pitch on the M20-1.5 is definitely on the mark, so I'll try an M22-1.5 hopefully that should do the trick...


https://www.amazon.com/Dorman-Autogr...dp/B07QQTTF63/

make sure that you transfer the o-ring to the new plug it you want it to seal correctly.

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post #13 of 15 Old 10-04-2021, 08:02 PM Thread Starter
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make sure that you transfer the o-ring to the new plug it you want it to seal correctly.

Yea I'm going to go with a brand new o-ring, I figure if the plastic plug cracked due to heat/fatigue, the o-ring could probably use replacing as well.


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post #14 of 15 Old 10-07-2021, 08:13 PM Thread Starter
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Well the M22x1.5 did the trick, fits perfectly. I ended up snagging this one off ebay because I recently ditched Amazon Prime as it's been going downhill for a while:

https://www.ebay.com/itm/201785920247

The ebay one also seems like a closer match, with the same hex head and space for the o-ring.

Thanks again for the tips all, spent about $15 as opposed to ~$150 for a new radiator.
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post #15 of 15 Old 10-08-2021, 01:30 PM
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