Having trouble loosening gas manifold nut

[easydoesit]

Any suggestions for loosening the gas manifold nut without breaking the thermostat? PB Blaster hasn't helped, yet. I'm afraid to torque it any more than I have, and there doesn't seem to be any place to put an opposing wrench to counter the torque. I'm trying to remove the burner assembly in order to replace the pilot assembly on a Rheem XP29T06EC30U1

 

[MicEd69]

It is a feel thing learned by experience about how much stress one can put on a fitting like that. The brass nut should not be so tight as to not being able to remove it with an adjustable wrench or a wrench of the proper size. If you have a line wrench, that would be better, but not really required.

 

[easydoesit]

Thanks for your reply. I don't have a line wrench, am using a small adjustable wrench, and briefly tried a larger adjustable. The body of the thermostat twists slightly with the force I've applied so far. My 'spider sense' says I'm pushing the limit of what the thermostat body or its mount into the tank can take, but then I can't really see how it's mounted.

The adjustable allows me to basically pull forward (wrench on right) or push left (wrench at 90 degrees to tank). Perhaps a line wrench or open end wrench would allow me to direct force toward the tank (wrench positioned to left) - not sure if that angle would make any difference in how much force could be safely applied. And maybe I can remove the thermostat plastic housing and find purchase for an opposing wrench. Will try again tomorrow...

 

[BlueSkyHigh]

I am not sure if it is possible, but can the plastic cover be safely removed thereby exposing some solid metalwork that you can grab with another tool, etc., to provide a force counter to the twisting force of the wrench you are using to undo the brass nut?

 

[Geofd]

If your trying to hold back on that round piece just below the plastic is the enough room for a basin wrench?????