8Mud
NAXJA Forum User
- Location
- Central Germany
I tried getting the broken stud out of the rear of the exhaust manifold, drilled it, easy out, torch, penetrating oil, that sucker was in there to stay. I even tried heating it, then spraying it, to cold shock it without any results.
I finally gave up and drilled it out and now have planned to thread it for M12.
My question is, any trick to cutting threads into the cast iron block? I've got a couple of good Taps, the guy at the tool place guarantees to be unbreakable. I've cut threads into cast iron before and it also made me antsy, you really have to crank on that Tap to get it to cut.
I would have just left it broken, I have in the past with no issues. But the gasket blew out right where the stud was broken and the exhaust manifold was spitting exhaust onto the firewall and very near the engine harness.
I finally gave up and drilled it out and now have planned to thread it for M12.
My question is, any trick to cutting threads into the cast iron block? I've got a couple of good Taps, the guy at the tool place guarantees to be unbreakable. I've cut threads into cast iron before and it also made me antsy, you really have to crank on that Tap to get it to cut.
I would have just left it broken, I have in the past with no issues. But the gasket blew out right where the stud was broken and the exhaust manifold was spitting exhaust onto the firewall and very near the engine harness.
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