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How to Drill Out a Broken Bolt?
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ups.com... JoeSpareBedroom wrote: wrote in message ups.com... I over-torqued four bolts in the lower unit of an outboard, and the heads of three bolts broke off. I managed to remove one of the broken bolt using a Dremel tool and a diamond grind bit. But I cannot remove the other two broken bolts using the Dremel tool. Based on the past posts in this newsgroup, I learn that the best option in this situation is to drill out the broken bolts. I would like to learn the details of the way to drill out the broken bolts. My question is: Which size of drill bit do I need? Should it be as large as the hole where the broken bolt is? Call around to hardware stores and ask if they sell spiral screw extractors. Before you jump in the car, measure the diameter of the bolt shafts you need to remove. And, if you know the socket size that fits the heads, write that down too. I tried that already. Either it didn't work or I went too easy on the hammer. Anyway, it could not grab the bolt and could not spin the bolt out. I attempted to drill one of the broken bolt away. But this simply messed up the thread in one of the hole. Hammer???????? |
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