Unless all the foreign metal from the old stud has been removed, you run the risk of breaking another tap. The thread chaser or tap should only be used to clean up the damaged cast iron threads from the chisels, punches, and picks used to remove the fragments of the old stud.
Please don't try to cut out old stud threads. You have done that once already and it didn't work. I call that method "cheating". You will probably get another failing grade. How many "Acks" are you willing to endure? Use heat, picks, and small chisels to remove the old stud fragments. Don't worry about buggering up a few threads. You have plenty to secure a lousy water jacket cover. And there is always epoxy thread repair material.
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Today's Featured Article - Tractor Profile: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
... [Read Article]
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