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Need help drilling out a broken subframe bolt

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Old 12-08-2008, 06:17 PM
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Default Need help drilling out a broken subframe bolt

Hey guys,

As you may have seen, I snapped a 19mm sub-frame bolt when I was doing my clutch install. I highly suspect the threads are galled.

About 3-4 inches of the bolt are still let in the frame.



Are there any shops that you would recommend that can drill it out using a guide/ jig so they can drill as close to perfectly in the center as possible and then clean the threads with a tap?

mines13 maybe

I REALLY want to avoid having to cut the frame.

Thanks in advance.

James
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Old 12-08-2008, 06:28 PM
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You can drill it out and rethread the hole. I never done it but i hear its not that hard.
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Old 12-08-2008, 06:31 PM
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Originally Posted by Jdmapl,Dec 8 2008, 10:28 PM
You can drill it out and rethread the hole. I never done it but i hear its not that hard.
I know this

I'd much rather pay a shop to do it since they can get the car up on a lift.
Also i just don't trust myself to drill it perfectly centered.
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Old 12-08-2008, 06:45 PM
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is there enough of the bolt sticking out to get a welder in there and weld another bolt on, heat it up with a torch and remove the old bolt?
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Old 12-08-2008, 06:48 PM
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Originally Posted by 2poor2mod,Dec 8 2008, 10:45 PM
is there enough of the bolt sticking out to get a welder in there and weld another bolt on, heat it up with a torch and remove the old bolt?
there is none of the bolt sticking out it is about 1-2 inches into the frame
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Old 12-08-2008, 07:26 PM
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if the car wasn't on jackstands i'd do it up for ya.
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Old 12-08-2008, 07:31 PM
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Originally Posted by Nick.,Dec 8 2008, 11:26 PM
if the car wasn't on jackstands i'd do it up for ya.
I will be taking it down this weekend. AAA FTW I can flat bed it anywhere within 100 miles I want.
How would you drill it so it could be as close to center and as straight as possible? \

This is not something would let anyone do free hand.

I have absolutely NO experience with this kind of stuff. Also, do you have the tap needed to re-thread it?

J's
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Old 12-08-2008, 08:07 PM
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A bolt puller might get the rest of what's in there out...so you wouldn't have to worry about it being the absolute straightest hole...and then just retap the hole.

I have a tap set if you guys decide to do this at home.
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Old 12-08-2008, 08:29 PM
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Originally Posted by Neutered Sputniks,Dec 9 2008, 12:07 AM
A bolt puller might get the rest of what's in there out...so you wouldn't have to worry about it being the absolute straightest hole...and then just retap the hole.

I have a tap set if you guys decide to do this at home.
bolt puller? never seen one? would it work on a galled bolt this big?
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Old 12-08-2008, 08:35 PM
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Originally Posted by Js S2k,Dec 9 2008, 01:29 AM
bolt puller? never seen one? would it work on a galled bolt this big?
Possibly. I have the tap/die set, but not the bolt removal set. I'd say give it a try first - if it doesn't work, you can still just drill out the hole and tap it. Drilling out the hole and retapping it will require using a bolt a size or two up from the stock, so make sure you can find the right length bolt first...
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