My radiator drain plug is broken half way in - Mercedes-Benz Forum
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#1 (permalink) Old 01-08-2012, 11:38 AM
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My radiator drain plug is broken half way in

Guys,

I finally found the plug. I turned it counter-clockwise very slowly and it broke . How do I get this stupid thing out?
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#2 (permalink) Old 01-08-2012, 02:02 PM
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Is it still holding coolant or is it leaking?

If it's holding coolant you can at least drive it while you get another plug.

Ultimately if it broke off clean and there is nothing to grab with pliers, you'll have to drill it out. Since it's plastic, you might also try heating a screwdriver with a torch and then poking it in the end (straight on) and removing it so that you melt a slot in it. Then when the screwdriver cools down you can put it in the slot and unscrew it.

Good luck.

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#3 (permalink) Old 01-08-2012, 02:33 PM
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thanks

I will try it next weekend. I didn't even think about melting it.
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#4 (permalink) Old 01-08-2012, 03:26 PM
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My brother in law said to disconnect the radiator hose instead of dealing w/ this drain plug. Could you guys post instruction on how to remove the hose please?
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#5 (permalink) Old 01-08-2012, 03:57 PM
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Loosen the clamp and carefully work the hose loose. Be *very* careful that you don't crack the hose fitting loose, although if you do it will be easier to replace the drain plug while you have the radiator out.

My suggestion is to wait. There is no urgency to change the coolant and you need to change the plug anyway, if you don't it may work loose at some point and start leaking. And you don't risk damaging the radiator hose connection, either.
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#6 (permalink) Old 01-08-2012, 07:12 PM
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If the plug holds, I would not mess with it. Pull the hose to drain the coolant.
Per my memory the plug has 2 orings and flanges going into precise machined hole. Too easy to make more mess and end up with the need for new radiator.
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#7 (permalink) Old 01-08-2012, 07:26 PM
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Drain Plug, 2001 E320

Katjek1,

I have a leaking radiator drain plug after doing a coolant flush. I ordered a new plug with the 2 o rings from autohausz. Is there a special way to line up the plug or do I just insert it into the radiator snug and hope for no more leaks? There is also a metal washer that fits on the plug. It seems out of place. Can I change that out with a similar size rubber washer?

Thanks,
Gene
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#8 (permalink) Old 01-08-2012, 08:43 PM
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I replaced the radiator over a year ago, but can't think about any metal washer on the plug. Maybe the washer keeps the plug from closing?
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#9 (permalink) Old 01-08-2012, 09:06 PM
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Thanks K,

I checked on the W124 forum as well and could only find vague reference to the washer being used as a heat barrier of some sort. I tried the plug without the washer and it still leaks a lot under pressure and a little with the engine off. No difference with the washer on. I'm pretty sure the o rings are the real problem. I see that the new plug does not come with a washer. I could check my 300E but I'm afraid of having two vehicles waiting on parts. I'm thinking of just leaving the washer off when I replace the plug unless I get some other input.
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#10 (permalink) Old 01-16-2012, 08:51 AM
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Quote:
Originally Posted by squirrelonfire View Post
Guys,

I finally found the plug. I turned it counter-clockwise very slowly and it broke . How do I get this stupid thing out?
You too, eh?

Mine broke just two days ago. Ordered a new one.

Unfortunately, I need to pull it to drain system and change thermostat. No to little heat this winter is getting annoying.

Going to try come liquid wrench and an easy-out to see if I can get the old broken plug out. Hope the new one has o-rings or I will be waiting another week.

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