Posted by Tom Fleming on September 09, 2009 at 01:41:27 from (67.20.240.67):
In Reply to: 10-20 manifold stud posted by Tony S. on September 08, 2009 at 21:20:05:
did you try alternating, heat then penetrating oil such as Blaster or Kroil?
If all else fails, grind the face flat (not flush.....flat). Use a center punch to mark center. start with small 1/8" drill, then progressively use larger drills until you stop 1-2 sizes smaller than the tap size for the hole. If you are lucky, and the bolt is not bottomed out, you will be able to get some penetrating oil "behind" it in the hole after you drill through.
Once you get close to the tap size for the hole, the square, fluted easy-out should work after a few days of letting the penetrating oil work.
Last effort that always works. Drill the bolt out to the correct tap size, and retap the hole.
The key here is to get the first hole centered...........
ps. left hand drills often will remove broken bolts if you have them. I bought a set just for such emergencies......
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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