Has a good plug and seal...yet continues to slow leak. Any ideas?

 

Edited October 9, 20205 yr by Wally

Leaks from the fitting? Can use Teflon tape, or permatex thread sealer and see if that helps.

1 hour ago, Wally said:

Has a good plug and seal...yet continues to slow leak. Any ideas?

The seal is not good.

I used a steel bolt on my OReilly Auto radiator.  Drilled a hole in it so it worked like the plastic ones.  It's surprising how few options there are for those plugs, and all of the options are poor quality.

9 minutes ago, Zed Head said:

The seal is not good.

I used a steel bolt on my OReilly Auto radiator.  Drilled a hole in it so it worked like the plastic ones.  It's surprising how few options there are for those plugs, and all of the options are poor quality.

I did exactly what Zed Head did on my O'Reilly radiator too but I didn't drill a hole for draining. I have to pull the lower hose off to get the fluid out. I also used Teflon tape as Heyitsrama suggest.

check for cracks near the drain port or porous welds

2 hours ago, Patcon said:

check for cracks near the drain port or porous welds

And that flat rubber washer.

got it fixed. put some teflon on plug. There was a small rubber O ring slightly inside. It was causing leak. Once i removed it and tightened....no leak