I am in the process of cleaning up my engine. 1955-62 Chevrolet 235. The prior owner had used galvanized and brass plumbers fittings to install the temp gauge capillary tube into the cylinder head. I ordered the correct bushing to do it right.
I’m having a hard time in removal of the old fitting. I have soaked it in kroll, and rustbuster for two weeks. The wrench size is 15/16. I can use my 12 point box end and get on it, however it is in so tight that it is starting to round off the corners. I have even attempted to use a pipe wrench, but the firewall is blocking me from using the pipe wrench at the correct angle. Can I pick up a 15/16 - ½ drive 6 point socket? I do not want to remove the head just to get this fitting off, just so I can replace it with the correct part.
I have thought of a chain wrench, but it will chew it up. And if it becomes too rounded, I will need to pull the head. Should I use a propane torch to expand the surrounding area of the head? I am just not strong enough to get this one to budge.
Any and all thoughts appreciated.
Thank you again,
Dale
