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Drain plug leaking from over-tightening plug cure; remove the radiator drain plug, retain anti-freeze-mix to re-install. Take the plug to your local well stocked "good" auto parts store. Tell them you need a self tapping and threading replacement plug one (1) size over. Also note while removing the plug wheather the radiator is brass or alum. If the radiator is alum., I would have a new alum. bunt installed by a qualified alum welder. Check the alum welder's rates, sometimes they may charge $125.00 just to " lite the torch ". If his rates are way outa-sight, you or a qualified machine shop can tap the plug opening to one size over. This is a relativily small job for a busy machine shop so don't expect same day or even next day service. I would expect that you do not have an alum. radiator, unless someone installed a replacement heavy duty towing radiator. If you do it yourself; while threading in replacement plug, and when new threads have 'caught' go 1/4 turn, then back off 1/8 turn, then go foreward again 1/4 turn, then back 1/8 turn, repeat until 1/2 way in, at this point back the plug all the way out. Now clean threads on plug and threads in radiator, repeat threading procedure above. Once done; flush radiator to remove any loose metal, metal left in system may cause premature wearout of water pump.

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