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Old 10-30-2003, 05:17 PM   #1
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HeliCoil Crankshaft in 91 Camaro

The Harmonic Balancer Puller trashed the threads on my crank, in the wisdom of this site can somebody direct me to the HeliCoil Kit to repair the threads, I don't think chasing the threads will work, Helicoil looks like the last option before the machine shop.
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Old 10-30-2003, 06:47 PM   #2
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I've never tried helicoiling, but I screwed up my crank threads (putting the balancer back on the wrong way) and just used a simple tap. Worked just fine.
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Old 10-30-2003, 08:08 PM   #3
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did it mess up the first couple of threads, or did it trash them all?
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Old 10-30-2003, 08:21 PM   #4
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For me, it messed up a few behind the first few threads. Obviously, I was able to get the tap started so it worked fine. I don't know what it would be like if I had screwed the first threads
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Old 10-31-2003, 07:46 AM   #5
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my guess is you never used a puller point and just screwed the puller into the crank right? second guess is all you need to do is chase the threads. to install a heli coil (7/16-24) you'd need to drill something around a 5/8 or 3/4 holt and tap it. i'd buy a tapered or starting tap and chase the threads and see what that does for you. if that works buy a installer for the dampner so you don't break something else
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Old 10-31-2003, 01:35 PM   #6
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You're absolutely right ede. I'd never done it before, but I learned my lesson. I'll always use the installer tool from here on out - SO easy!
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Old 10-31-2003, 07:30 PM   #7
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Actually, the snout threads are 7/16-20. If you've buggered the threads, you can retap to 1/2-20 without even drilling. Just be very careful to pick up the lead thread and have at it.
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Old 10-31-2003, 09:07 PM   #8
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Yeah that's a brilliant idea. If you can at least get the tap started, give it a try. Definitely the simplest solution.
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Old 10-31-2003, 10:47 PM   #9
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Start with a 1/2-20 plug tap, and finish with a 1/2-20 bottoming tap (if you like). It always works for me - yeah, I've learned the hard way, too.
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Old 10-31-2003, 10:59 PM   #10
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Whoa! Vader's mortal!
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Old 10-31-2003, 10:59 PM
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