I’m replacing my stock ST165 exhaust manifold with as ST185 manifold to accommodate a KO Racing Street Brawler turbo setup.
I pulled all the manifold studs, chased the threads, and installed new studs, with the exception of one stud that broke off as I tried to remove it.
I drilled the stud out, and tried to remove it with a bolt extractor. This bolt extractor is a tapered kind that screws deeper into the hole as you turn it to unscrew the stud.
Unfortunately, so much pressure built up that it broke the stud boss right off the cylinder head!
I need my ass kicked for not seeing the drawback of this tool and should have went with a square type.
Regardless, I’m hating life now.
Here is a picture of the broken boss.
Has anyone experienced anything like this?
I called a very good local mechanic and he said he just repaired a 3SGTE head out of an MR2 Turbo a couple weeks ago. The same hole broke on it. He was able to successfully build up weld and tap and Heli-Coil a new hole. But the head had to be removed.
Just sharing my story for pity, ridicule, or just warning others what not to do…