What is the best thread sealer you guys have used?

I need a good one to stop a pesky oil leak on the drain plug of my oil pan. The gasket sealing surface on the oil pan has a dent/low spot that allows oil to seep out under the washer. I'm thinking that if I can seal the threads, the oil will not get to the gasket under the drain plug hex head and the leak should stop.

So far I have tried silicone RTV, teflon tape, Loctite 592 PST, Loctite 14 thread sealer, and Loctite 518 anaerobic sealer. But none of them have worked.

Chuck
85 IROC

 

Thread sealer will be pretty useless on the drainplug, no way to avoid getting oil on it. Try using a different kind of drain plug gasket, they make one time use (crush) copper gaskets that work great. Or even a good new fibre or plastic plug gasket should do.

 

C.D.,

Depending how large the "dent/low spot" actually is, you may never be able to get it to seal. If you are capable with a accetylene torch set or MIG welder, you could drain the sump completely, clean the area and fill in the low spot with weld or bronze, then grind/file/sand it flat again so the plug has a better chance of sealing around its perimeter.

I suppose you could clean it really well and try some of the metal repair putty, like Certainium or J.B. Weld, but I personally don't have great faith in those metal epoxies.

The other option may be to use one of the universal rubber drain plugs made for stripped oil pans, but I've never seen one of those that didn't drip either.