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Post by Doo640ER on Feb 29, 2020 22:31:59 GMT
If you have been following the "What Are You Working On" thread, you might have noticed that I am working on my 72 Nordic 640 rear track/suspension. I unfortunately broke-off a bolt in the 18" cross shaft that held the front set of bogies in place. I was as careful as I could be when I started and was able to get the other 5 out with little problems. In an attempt to save a few $bucks, and with the great encouragement of olyman, I decided to attempt the extraction of the broken-off bolt. In this case I was lucky enough that there was about 1/8 inch of bolt protruding from the end of the shaft. I started by heating the end of the shaft with a propane torch. I have an oxy-acetylene outfit, but figured that would have been too aggressive to start with. Once I got it good and hot, I grabbed the little bit of bolt with my small vice-grips and was successful in getting it to turn about 1/8-1/4 turn. I then soaked it with Free-All penetrating fluid. PB Blaster would work too, or your favorite penetrant. I then took out my Dremmel and using a small cutoff wheel, I cut a slot into the bolt ending up with a slot, just like the head of a pan-head screw. I heated it back up with the torch and slowly worked the bolt back and forth while keeping it lubed well. I got the broken off bolt out without buggering-up the threads. Just thought I'd share.....   |
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Post by olyman on Mar 1, 2020 14:54:23 GMT
Awesome! Good job and description doing it too.
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Post by skidoo292 on Mar 2, 2020 3:04:31 GMT
I'm not sure if I saw this on here a few years back or where I seen this tip but I have used it many times with great success on aluminum. when you get the shaft warmed up a bit touch the end of the broken bolt with a wax candle . The wax wicks itself right down the threads and works great. Now I am using a wax seal for resetting a toilet bowl I just wipe a bit on my screwdriver blade and then touch it. I also use it for lube for drilling Just dip the drill bit in the ring once in a while when you are drilling to keep it cool Then you can just cover it back up and slide it back in it's box. Easier to store than a candle in my opinion.
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Post by Doo640ER on Mar 3, 2020 23:28:56 GMT
I'm not sure if I saw this on here a few years back or where I seen this tip but I have used it many times with great success on aluminum. when you get the shaft warmed up a bit touch the end of the broken bolt with a wax candle . The wax wicks itself right down the threads and works great. Now I am using a wax seal for resetting a toilet bowl I just wipe a bit on my screwdriver blade and then touch it. I also use it for lube for drilling Just dip the drill bit in the ring once in a while when you are drilling to keep it cool Then you can just cover it back up and slide it back in it's box. Easier to store than a candle in my opinion. Silly me, I totally forgot to try this technique and I've always wanted to. Yes there was info on this on the original site and I've see info on it posted elsewhere also. One possible advantage to the wax candle trick is that is probably doesn't smoke or fume as much as the Free-All did when really hot. Probably not good to breath the fumes of the volatile Free-All. I've got to remember to try the wax next time. After the Nordic work is complete, I need to dig into the 70 TNT slide suspension and drivers and I'm willing to bet that I will have a few opportunities. |
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Post by skidoo292 on Mar 6, 2020 0:39:37 GMT
I have found it works better if it isn't really hot And then walk away for a while till it cools completely It's amazing when you see the wax at the bottom of the thread I even used it on a threaded on clutch a couple of weeks ago.
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Post by 69nordic on Mar 6, 2020 5:22:53 GMT
My uncle showed me the candle trick 50 years ago it works well on exhaust manifold nuts and studs.
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