O2 Sensor bung

[Steve455]

I was taking my O2 sensor out of my 96 outback and the bung that holds the O2 sensor in came out,has anyone ever had this happen to them and can a new bung be welded in to the catalitic converter or do i have get a whole new catalitic converter?

[Skip]

Hi Steve, Yes you can buy the bung, any good parts

house that handles exhaust parts will have them.

 

A good MIG welder can weld it back on, but you will not doubt have to remove said cat.

[Steve455]

I took the exhaust from the back cat to the heads off.I didnt know if the bung could be welded on,looks like the old one was soldered on.

[porcupine73]

I'd imagine an exhaust shop could weld a bung on pretty fast (and hopefully even cheap since you already have the exhaust removed!).

 

You could maybe TIG weld it back in but I don't know since I just started reading welding for dummies.

[ron917]

Any muffler shop or weldor should be able to do that for you.

 

If it were me, I'd try to silver braze the bung on. It's easier to get a good seal with brazing, since the filler flows like solder. Silver brazing is compatible with stainless steal, which is what the cat is made of. I can weld (MIG and gas), but my skills aren't enough that I would be sure of a good seal.

 

Don't try to use solder, like for plumbing or electronics. It won't stick to stainless steel (at least not easily), and it melts at too low of a temperature.