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SN95 Cobras
Broken crank bolt extraction
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<blockquote data-quote="Metal Head" data-source="post: 13655308" data-attributes="member: 135015"><p>Re-drilling and tapping a crank snout is not something I would try to do in the car, especially when starting with a buggered up hole. The tap drill and threads need to be cut into the crank squarely and on axis. I don't think you are going to be able to manage that with a Makita drill. This is something that should be done in a machine shop on a lathe. </p><p></p><p>The only way to do it properly in the car would be to have a jig made that slips over the crank snout with a drill bushing to hold your bit and then another for the tap. Without a round starting hole I doubt you'd end up with a desirable result even with the jig. </p><p></p><p>I foresee a lot of wasted time grinding out an extractor,and the rest of the bolt only to end up with a broken off tap drill or tap in another off center hole. :uh oh:</p></blockquote><p></p>
[QUOTE="Metal Head, post: 13655308, member: 135015"] Re-drilling and tapping a crank snout is not something I would try to do in the car, especially when starting with a buggered up hole. The tap drill and threads need to be cut into the crank squarely and on axis. I don't think you are going to be able to manage that with a Makita drill. This is something that should be done in a machine shop on a lathe. The only way to do it properly in the car would be to have a jig made that slips over the crank snout with a drill bushing to hold your bit and then another for the tap. Without a round starting hole I doubt you'd end up with a desirable result even with the jig. I foresee a lot of wasted time grinding out an extractor,and the rest of the bolt only to end up with a broken off tap drill or tap in another off center hole. :uh oh: [/QUOTE]
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Broken crank bolt extraction
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