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post #5 of (permalink) Old 08-11-2014, 12:26 AM
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Join Date: Jan 2008
Location: Seattle, WA area
Posts: 10,299
Re: Plastic Radiator Petcock Fix

The plug is rubber molded around what is equivalent to a washer with a stud on it. When you tighten the nut, it pulls the washer towards the nut, expanding the rubber between them. Check your plug for excess rubber on the end. Remove any of it you can so the plug will seat deeper and try again. Perhaps Tommy (the original poster) had a different and shorter plug brand.

If all else fails, I have seen two other methods used. One is to set a freeze plug in with RTV or epoxy, although that's permanent, and future draining would be by removing the lower radiator hose. The other is a slightly over-sized bolt or screw that will re-thread into the old thread hole, with an O-ring or faucet washer under the bolt head. Use whatever works for you. Good luck, and let us know what you come up with.


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