Joe, Appreciate the O2 Sensor update. My understanding is the inner part of the sensor has a porous noble metal (usually Platinum) surface. The lead will clog these pores and prevent movement of oxygen molecules into or out of the cell. Without the oxygen movement there is no sensing possible. Any mechanical action, like using a wire brush on the interior element, to remove the lead would easily strip away the super thin Platinum plating and destroy the cell. Perhaps you may have discovered a chemical solvent method to revive a lead clogged O2 sensor.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA smw...@md.metrocast.net --------------------------------------------------------------------------------- This is mostly for Sid Woods information as he is keeping a running tab for mixture information. I have an O2 sensor on both exhaust with a switch to check back and forth. Both of the O2 sensors were replaced in June of 2011 and both quit working some where around SNF of this spring. Both with inn a week or so of each other at around 105 to 110 hours total time. While doing the annual this month I replaced one and too the bad one and soaked the sensor end in lacquer thinner for a few minutes and cleaned it up with a wire brush and put it in the other side just to try it. To my surprise it worked. It might be showing just a shade rich of what a new one indicates but still very close and really I only flew for about 20 minutes so not much checking done. I will keep a running tab on the difference between the new and the old and see if it works for a significant amount of time. I just gave it a try for curiosity and had nothing to loose. Now I have to do a little research to see how these rascals are made inside. The thing that gave me the idea of trying to clean it was it just looked like the lead build up was closing the tinny slots on the outside of the sensor.Joe Horton,Coopersburg, Pa735 hours
