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Algorhythm 05-04-2008 05:49 PM

[How To] Removing a broken bolt.
Removing a broken bolt.

Working time needed: 10 minutes

Materials needed:
  • Drill
  • Screw extractor set
  • Proper drill bit(s)
  • Hammer
  • Patience
Note! This was done on my 1986 Honda CB450SC Nighthawk! Obviously, it is not a car, and it will be a different situation for everyone! I figured some people might not know how to do this, so I wrote up a quick little how-to. Be sure to take your time and not mess up!

First, a picture of the damage.

Removing the broken bolt:

Prepare your tools and lay out your workspace. This is going to take a lot of patience so you do not want to toss everything around to look for your desired tool.

First, grab your screw extractor kit and locate the required drill bit size for the screw extractor that you need. Mine was 7/64", yours will be different.

Now, put the drill bit in the chuck and start drilling SLOWLY. I had to do it extra slowly since I did not want any metal filings in my crankcase.

Once you get a good depth inside the broken bolt, retract the drill and locate your screw extractor set.

Line up the screw extractor in the hole you just drilled and begin hammering lightly, gradually hammering harder until the screw extractor becomes lodged inside the drilled hole. Be sure not to hammer too hard!

Take your wrench and start turning counter-clockwise to loosen the broken bolt.

Remove the perpetrator and bask in the glory of your power tool.

Hope you liked the how to. Any questions can be posted in this thread. Since I took the time to write this, I would appreciate some Thank you!


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bcvali 05-04-2008 06:01 PM

useful info!

S2 05-04-2008 06:23 PM

Added to the HOW TO ARCHIVE.......

hockeyfreek42 10-07-2010 11:17 PM

i had to do this changing my coil out

i got that same bNd extractor set but i stillk couldent get the rusted screw out so i used the extractor inside the dril and then broke it :(
so i used the next size extractor and started over and finally got it out

then i went back to hompdepot returned the broken one and exchanged it for a new set :)

ucyifly 10-08-2010 10:33 PM

Just make sure you take your time and do this very carefully. I have always heard that an E-Z Out/Extractor/whatever you want to call them CANNOT be drilled, meaning you wouldn't be able to remove anything if it breaks. Fortunately I have never broken my E-Z Outs when extracting broken bolts to find out if this is true or not. Just take your time and do it right the first time and it won't matter.

metrognome 07-31-2013 04:06 PM

Just an FYI..many people don't know about left handed drill bits for removing broken bolts. I have sets of several type of removers but always go with the LH drills first. 75-80 % of the time that works. So here's a youtube video showing the procedure:

amc49 07-31-2013 05:40 PM

AND, the entire pictured post is flawed as h-ll. Totally goofy way to do it. Shows guy drilling with cover on like he doesn't want to remove it, then he removes it later, so why not drill later with more open space to see things clearly? Worse yet, he could've easily removed the entire cam cap to drill it out on bench and no trash in engine AT ALL. Not smart at all there...........the post was at least invitation to further damage like blown motor and incompetent.

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