Copper nuts, exhaust leaks! Options

[mgphoto]

Hello,
I am having a problem with exhaust leaks, I am, for the first time using copper nuts as opposed to the steel with insert and flange Porsche part # 039.256.297 see photo below.



I would still be using these if I hadn't lost one, and Porsche says these are NLA.
The procedure I would use, after replacing the copper seals, I would use Never Seez on the studs and torque the steel nuts to 16 ft-lbs.

I am not sure if I should use Never Seez with the copper nuts and I am not sure the torque is correct for these fasteners, as they are oval shaped and seem tighter to start with?

Any experience with this would be very helpful.
Thanks,
Mike

[realred914]

i'd still go with the specified torque as pointed out the self locking nut will cuase more fritction so the torque down on the nut will be a bit less than what the torque wrench indicates (however the torque on the stud will still read right so dont over compensate ) to helpo reduce the friction effect of the nut, be sure you sue plenty of antiseieze this will help lube and give you closer to the real torque value.

be sure to anneal the copper gaskets heat red hot on a stove top then allow to slow air ccol, this will soften them and allow thenm to deform adn seal easy.

have fun

[mgphoto]

i'd still go with the specified torque as pointed out the self locking nut will cuase more fritction so the torque down on the nut will be a bit less than what the torque wrench indicates (however the torque on the stud will still read right so dont over compensate ) to helpo reduce the friction effect of the nut, be sure you sue plenty of antiseieze this will help lube and give you closer to the real torque value.

be sure to anneal the copper gaskets heat red hot on a stove top then allow to slow air ccol, this will soften them and allow thenm to deform adn seal easy.

have fun

Hey thanks realred914, so just to clarify, the copper gaskets are not quenched in water after heating?