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SN95 Cobras
Broken crank bolt extraction
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<blockquote data-quote="captthunderpnts" data-source="post: 13643956" data-attributes="member: 129580"><p>Well, I seemed to have screwed the pooch on my 98 vert, all because I wanted to install a fluid damper.</p><p></p><p>Backstory: Picked up a March 1158 to replace an unknown set of UD pulleys that were on the car when I purchased. I've been eating through belts every 10k, so natural instincts told me to go ahead and refresh the entire pulley system under the hood.</p><p></p><p>The first issue arose when I went to break loose the crank pulley to remove the existing balancer. I assumed it should have been torqued to over 60 ft-lbs at the very least. She came out with nothing more than the flick of my wrist. Of course, I didn't really think anything of it because I was so excited for my new fluid damper.</p><p></p><p>After some light reading, I threw the 1158 into the oven for a half hour to expand it (I was unable to get it to slide on the crank out of the box). To my dismay, this did not help the situation, and I could barely get the pulley onto the snout, much less pressed into the front oil seal. In my haste, I decided to put the old balancer back on and make sure that it was torqued to spec. Here's where the fun starts.</p><p></p><p>Everything was going well, the balancer was snugly back on the crank, and I finger-tightened the OEM bolt until it was snug. I then proceeded to unbox and use my brand new Craftsman torque wrench, in the 1/2in drive flavor. I set it to 60 ft-lbs and started torquing. Turn after turn, it just kept spinning...getting more resistant along the way, but never setting off the refreshing click of the torque wrench. One more turn, and the bolt snapped off into the snout, about 3/4in recessed.</p><p></p><p>I decided to try my luck at drilling out the hardened steel bolt from the crank, only to end up with this:</p><p></p><p>[ATTACH=full]1419909[/ATTACH]</p><p></p><p>Now, on a scale from 1 to 10, how screwed am I? I don't have the means the yank the motor out of the car to remove the crank, and I also don't know of any shops in my area that would successfully do the job without charging me the cost of a new motor. Any suggestions or even blunt realities are warmly welcomed.</p></blockquote><p></p>
[QUOTE="captthunderpnts, post: 13643956, member: 129580"] Well, I seemed to have screwed the pooch on my 98 vert, all because I wanted to install a fluid damper. Backstory: Picked up a March 1158 to replace an unknown set of UD pulleys that were on the car when I purchased. I've been eating through belts every 10k, so natural instincts told me to go ahead and refresh the entire pulley system under the hood. The first issue arose when I went to break loose the crank pulley to remove the existing balancer. I assumed it should have been torqued to over 60 ft-lbs at the very least. She came out with nothing more than the flick of my wrist. Of course, I didn't really think anything of it because I was so excited for my new fluid damper. After some light reading, I threw the 1158 into the oven for a half hour to expand it (I was unable to get it to slide on the crank out of the box). To my dismay, this did not help the situation, and I could barely get the pulley onto the snout, much less pressed into the front oil seal. In my haste, I decided to put the old balancer back on and make sure that it was torqued to spec. Here's where the fun starts. Everything was going well, the balancer was snugly back on the crank, and I finger-tightened the OEM bolt until it was snug. I then proceeded to unbox and use my brand new Craftsman torque wrench, in the 1/2in drive flavor. I set it to 60 ft-lbs and started torquing. Turn after turn, it just kept spinning...getting more resistant along the way, but never setting off the refreshing click of the torque wrench. One more turn, and the bolt snapped off into the snout, about 3/4in recessed. I decided to try my luck at drilling out the hardened steel bolt from the crank, only to end up with this: [ATTACH=full]1419909[/ATTACH] Now, on a scale from 1 to 10, how screwed am I? I don't have the means the yank the motor out of the car to remove the crank, and I also don't know of any shops in my area that would successfully do the job without charging me the cost of a new motor. Any suggestions or even blunt realities are warmly welcomed. [/QUOTE]
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