Should I put anti seize on o2 sensor threads??

[froggy47]

Installing Corsa exhaust & I actually already did it, is this appropriate on the o2 sensor threads or did I screw up? It's also got a crush washer (used the old one).


What do you put anti seize on usually?


Thanks.

 

[Robertwav1]

I always use "never seeze" on an O2 sensor threads. It's a mechanics best friend. Just make sure you don't get on the sensor itself. Never ever had a problem with an O2 sensor cause I used the suff. As a matter of fact I just did a 95 mustang GT and guess what? The never stuff came with the sensors!

 

[froggy47]

Thanks Robert.

 

[Hib Halverson]

You always want antiseize on an O2S but there's one catch...the typcial antiseize compounds you get at a parts store won't work. The temps oxygen sensors see usually burn the compound away after a time making removal of a sensor which has been in-place for a long time very difficult or impossible without destroying the threads on the sensor bung.

At the factory, O2Ses are installed with a special antiseize compound that contains glass particles to help the AS compound remain durable at the high temperatures O2Ses have to endure.

This is why many high quality sensors, such as Denso and Bosch, come with a little tube of special antiseize compound. I have found that sensor mfgs. usually give you more than enough, so I'm always careful to save what's left in case I need to remove or change a good sensor and require more compound for the replacement.

In lieu of the special stuff that comes with many sensors, I've also had sucess with DuPont Krytox high-temperature antiseize compound.

 

[froggy47]

Thanks Hib & I enjoyed your article. Looking forward to the next installment!

The sensor had some factory compound left on it (50k miles) & I added some that came with the Corsa exhaust in a little pouch. It might have had GM stamped on it but I doubt it was special for o2's.

How tight do you screw in an o2? I had a big open end (22 mm?) on it with two hands - so it's pretty tight. Maybe 50 -60 ftlbs?
Not as tight as a lug nut, but pretty darn tight.