I am trying to remove the sludge plugs from my crankshaft. They appear to be original as this crank has never been turned or balanced. The plugs have 1/4" internal hex keys. I have tried moderate heating with a MAP torch and then tried turning one with a device that I attach to my rivet gun. It allows me to hammer and turn at the same time. Alas, no luck. My next thought is more heat, but in a more specific area by using my oxy torch.
Anyone willing to share their experiences would be greatly appreciated.
Regards,
Steve Baker