Ok. I new this would happen. I am pulling everything off of my motor so I can pull it to do a rebuild. I have already noticed two bolts where the bolt head of broke off. I broke another one while trying to pull off the water pump. I use the bolt release lub like wd40 but its called something else. I will eventually get the other bolts off but how do I get broken bolts out of the motor? I have heard about drilling them out but I am afraid that I may mess that up. Is there a special tool or something that I can use. Lookin for help with this one.
Broken Bolt
- Thread starter rmousir
- Start date
A
Anonymous
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There are a few methods for doing this, one is to drill out the hole with a bit smaller than the thread diameter and then remove what is left, although some bolts cannot be done this way it depends on how it was broken, if it sticks out of the hole you will have a hard time keeping the drill straight or potentially wrecking the threads....
They also make reverse bits that you can use and might even break the bolt loose on the drill out, and there are taps and can be used to remove a broken bolt.
My favorite tool is the dremel. I removed three bolts I broke off on my head with it. I drilled straight down the center of the bolt and opened it up from there, after a few minuites the fragments that are left can be removed with pliers and some metal picks.... then run the threads through to clean up anything you might have scratched. It takes some patience but is not hard.
They also make reverse bits that you can use and might even break the bolt loose on the drill out, and there are taps and can be used to remove a broken bolt.
My favorite tool is the dremel. I removed three bolts I broke off on my head with it. I drilled straight down the center of the bolt and opened it up from there, after a few minuites the fragments that are left can be removed with pliers and some metal picks.... then run the threads through to clean up anything you might have scratched. It takes some patience but is not hard.
If you can, drill a small hole in the center of the bolt for relief. Then heat the bolt cherry red with a torch. Let the bolt cool back to room temp and spray penetrating oil on the bolt. If you can get a pair of vice grips clamped to the bolt, gently work it back and forth to loosen the threads. If it does not come loose then heat it again and allow it to cool. If the bolt is broken off flush with the block you may have to weld a flat washer to the broken bolt. Use a washer that is the same size as the bolt. You will use this washer to clamp the vice grips on. Be very patient. This will work if you take your time. If all else fails you may have to drill the bolt out to the threads and retap the hole.
one method I have used is to build a MIG bead on top of a flush bolt and use visegrips to work it loose. puts heat in it and gives something to turn it with.
nick
nick
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