When trying to remove the waterneck I wrung off the head of one of the bolts. It looks like the stud of the bolt is rusted down in the threads to the point that it looks welded in. I have tried heating it up, I've used PB Blaster and CRC Freeze off and nothing has worked. I've also used a hammer hoping to break it loose. Does anyone have any suggestions? The motor and intake are matching (69 Convertible Cutlass) and I don't want to take the chance of messing the intake up. Thanks.
if you have some threads sticking up, you might be able to weld another bolt to it. worst case, drill it out carefully & heli-coil it.
welding through the middle of a nut to the old stub is the best way... can you wedge a nut over the exposed remnant?? use a roll pin inside to act as s drill guide to keep a drill going straight without walking to the side.. drill straight through the steel... but not into the aluminum... use some kind of tubing or other device to stop limit the depth drilled...you can then increase the drill sizes.. till you reach the inner parts of the threads.. then hopefully pick them out with a carbide scribe..
Cast iron intake, I presume? Yes, all the advice is good. What works for me is welding to the nut, letting it cool, being persistent and patient with penetrating oil. Failing that (and keep trying), drill precisely and tap. If you use a left handed drill bit for the occasion, you may get lucky and have it back out during the drilling. Best of luck!
in addition... when things go wrong..you do have the option of self tapping threaded inserts...silverseal products sells these... there are several brands of them if you look hard enough..you drill a straight sided hole put a nut on a proper size bolt.. usually 4 to 6 inches long thread this on the bolt till its flush with the end.... run the nut down to lock it in place.. then holding the top of the bolt to keep it aligned.. use a wrench on the jam nut to turn this into the hole... it works great... i have used them dozens of times when i worked at an engine rebuilder.. places like grainger can also order solid threaded inserts.. with various outside thread diameters...
I had a bolt do this to me in the same fashion, I heated it red hot and then let it cool........ then the next day repeated it and it did come out. Two days waiting and in-between nailing it with blaster.. maybe it wont work on yours, Just thought id throw this in also if you can do it a couple days and wait. Good luck!
Thanks everyone for the tips. I'll let you know how it turns out!