Is it 17 mm for the flare nut?

yep 17mm and I might need to use heat on it.. used a flare wrench.. used channel locks to turn.. still wont move.. however having said that trying to get the pipe off the head would be a bit odd.

Remove the EGR valve and gasket.

Use two nuts. The 12's that came off will work.

Use a wrench on the inner jam nut and you can turn the stud out.

This will give you room to use either vise grips or a small pipe wrench.

PB the copper pipe well .

This won't strip the nut and gives you the oomph to pop it loose.

Heat won't hurt, but I had to resort to the above method to get mine off.

Didn't have to remove the bottom one in my sitaution, but I'll cross that bridge when I get to it.

 

O.

Thanks will have to try that one if my issue returns.