Pitbully
New member
Hi Guys,
After an extensive search lasting a good few months, I found an untouched A12 aluminium GX Head.
New guides and seals fitted, new valve seats, new valves. Then fitted it. Found a small leak at the rear welsh plug. In the process of taking the head off again to fix the welsh plug, then I broke one of the studs off. Tried with a vice grip and wrench to get the remaining stub out but it then broke off flush with the metal surface. OK no problem drilled a small 6mm hole inside the stub to get it out with an easy out.
I never knew steel could adhere to aluminium so strongly as the other studs came out very easy.I liberally applied penetrating liquid and left it for more than four hours to penetrate.Then heated it with a torch to get it out, and in that process I managed to break off the easy out again inside the original stud flush with the metal surface.... It wont drill out as the metal is probably even harder than the drill bit itself . I have tried tapping it with sharp punches to get it to turn. no luck. I have even tried to cut a 2 mm crosscut in the stub with my die grinder to get it to turn with a screwdriver, 4 stuffed screwdrivers later no luck.
I am outta ideas/plans to fix this....Please help !!!!!!!!:sad2:
After an extensive search lasting a good few months, I found an untouched A12 aluminium GX Head.
New guides and seals fitted, new valve seats, new valves. Then fitted it. Found a small leak at the rear welsh plug. In the process of taking the head off again to fix the welsh plug, then I broke one of the studs off. Tried with a vice grip and wrench to get the remaining stub out but it then broke off flush with the metal surface. OK no problem drilled a small 6mm hole inside the stub to get it out with an easy out.
I never knew steel could adhere to aluminium so strongly as the other studs came out very easy.I liberally applied penetrating liquid and left it for more than four hours to penetrate.Then heated it with a torch to get it out, and in that process I managed to break off the easy out again inside the original stud flush with the metal surface.... It wont drill out as the metal is probably even harder than the drill bit itself . I have tried tapping it with sharp punches to get it to turn. no luck. I have even tried to cut a 2 mm crosscut in the stub with my die grinder to get it to turn with a screwdriver, 4 stuffed screwdrivers later no luck.
I am outta ideas/plans to fix this....Please help !!!!!!!!:sad2:
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