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| &^%$# busted bolt https://www.ausmini.com/forums/viewtopic.php?f=2&t=22610 |
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| Author: | Blokeinamoke [ Sat Sep 16, 2006 4:42 pm ] |
| Post subject: | &^%$# busted bolt |
I ve had enough now. A bolt, one of the ones used in the front mounting of the rear subframe broke whilst I was tightening. I have tried to drill it out so I can use as Ezout or just drill it out. I have gone through two bits for seemingly no impression the decapitated bolt. A small amount is through the other side into one of the boxes but not enough to weld a head on ...arrggghhhh.. Any suggestions? |
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| Author: | drmini in aust [ Sat Sep 16, 2006 4:57 pm ] |
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I know about busted studs and bolts, I have replaced heaps of SS ones in outboard motors over the years. Oh I'm a fitter by trade so know what I'm doing too. 
May be too late now, but... 1. Ezy outs are a waste of time if it's rusted in there (it is) and busted off. 2. I drill the bolt out on center to 5/16". Then I tap it 3/8 UNC and use a starter motor bolt. 
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| Author: | Blokeinamoke [ Sat Sep 16, 2006 5:02 pm ] |
| Post subject: | |
drmini in aust wrote: I know about busted studs and bolts, I have replaced heaps of SS ones in outboard motors over the years. Oh I'm a fitter by trade so know what I'm doing too.
May be too late now, but... 1. Ezy outs are a waste of time if it's rusted in there (it is) and busted off. 2. I drill the bolt out on center to 5/16". Then I tap it 3/8 UNC and use a starter motor bolt. Nope its not rusted. It was a new bolt into a clean threaded hole. I cant drill it out it keeps eating bits. |
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| Author: | awdmoke [ Sat Sep 16, 2006 6:02 pm ] |
| Post subject: | |
A jobber drill bit won't do it - buy one of those flash Titanium nitride coated ones 
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| Author: | drmini in aust [ Sat Sep 16, 2006 6:32 pm ] |
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... or U could use a carbide one. I just use nice sharp std HSS drills, not the crappy `made in PRC' ones though. The TiNi coated ones are pretty, but no harder than a good std HSS one. I only buy Suttons, P&N or Frost.
Don't run `em fast. Grade 8 bolts are tuff stuff. <edit> if the 5/16" UNF bolt is still in there, drill it out 7.0mm, then run a 5/16 UNF tap thru it. |
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| Author: | 9YaTaH [ Sat Sep 16, 2006 9:01 pm ] |
| Post subject: | Punch |
Try a sharp centre punch dead centre...could help the drill bit get started. or Dremel to square off whats left??? then drill and tap 
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| Author: | Blokeinamoke [ Sun Sep 17, 2006 9:18 am ] |
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Thanks to all that offered suggestions. I got the wrotten thing out by cutting a vertical grove in the end that was in the box (about 1/2mm) with a hacksaw and then backing it enough with a screwdriver to weld on a nut and then voila its out. Yippeee. It took 5 minutes to do and two days to work out what todo. Maybe I should have asked the wife
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