As I recall, even with heating the bung to red hot it was still a bitch to unscrew the sensor. You definitely will want a wrench on the bung to prevent it from twisting in the exhaust header and creating a weak spot around the weld there.
Especially if the header is of relatively thin material like 0.035 SS.

Finn


On 12/2/2010 9:16 AM, Al Gietzen wrote:

Subject: [FlyRotary] Re: Help - O2 sensor removal

 

Use anti- seize next time. 

Brian Trubee

Looking at the new Bosch O2 sensor, I find the threads amply covered with an anti-seize compound; and recall the prior one was the same. So that’s been done.  Haven’t had a chance yet to have another go at removing it, but I’m sure it will get done. Meanwhile the current one is still functional.

Thanks,

Al

 

-----Original Message-----
From: Al Gietzen <ALVentures@cox.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, Nov 30, 2010 2:39 pm
Subject: [FlyRotary] Help - O2 sensor removal

After about 130 hrs my O2 sensor seemed to be getting a little sluggish; so I decided to replace it. I put a wrench on it and unable to budge it.  A bigger wrench and still no luck – getting worried about cracking the weld around the bung, or some other damage.  Any ideas about getting that thing loose?

 

I didn’t put anything on the threads when I put it in – perhaps next time; but what?

 

 

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