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Bad Luck (broken bolt)

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Old Oct 20, 2012 | 10:48 PM
  #1  
actarnoff's Avatar
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Car: 1991 RS/B4C clone
Engine: 355 TPI
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Bad Luck (broken bolt)

I was installing my 1LE kit from Ed Miller today, and while I was torquing the caliper adapter bracket to spindle bolt to spec, the head snapped right off. Now I have no idea what to do. Has this happened to anyone before? I am beyond frustrated, and as of now have an inoperable car.
Attached Thumbnails Bad Luck (broken bolt)-imag0433.jpg  
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Old Oct 20, 2012 | 11:00 PM
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t-top havoc's Avatar
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Re: Bad Luck (broken bolt)

Can you remove the bracket & use vicegrips or is it busted flush on the mount?
IDK- grasping at straws for an idea
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Old Oct 20, 2012 | 11:12 PM
  #3  
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From: Los Angeles
Car: 1991 RS/B4C clone
Engine: 355 TPI
Transmission: Probuilt Street/Strip 700r4
Axle/Gears: 7.625 axle with 3.23 gears/TrueTrac
Re: Bad Luck (broken bolt)

Dude, you are a huge effin' stud. In my frustration, I didn't think of the most simple solution. I owe you a beer.
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Old Oct 20, 2012 | 11:16 PM
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Car: 87' IROC
Engine: L98
Transmission: T56
Re: Bad Luck (broken bolt)

Originally Posted by actarnoff
I was installing my 1LE kit from Ed Miller today, and while I was torquing the caliper adapter bracket to spindle bolt to spec, the head snapped right off. Now I have no idea what to do. Has this happened to anyone before? I am beyond frustrated, and as of now have an inoperable car.
What size bolt and what were you trying to torque it to?
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Old Oct 20, 2012 | 11:17 PM
  #5  
actarnoff's Avatar
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From: Los Angeles
Car: 1991 RS/B4C clone
Engine: 355 TPI
Transmission: Probuilt Street/Strip 700r4
Axle/Gears: 7.625 axle with 3.23 gears/TrueTrac
Re: Bad Luck (broken bolt)

It was a 14mm head, I'm not sure what pitch it was. His instructions specified 75 ft lbs, which the bottom bolt did, but the top just sheered. I'm thinking it's because the top bolt bottoms out in the hole as opposed to the bottom one which has a hole on the other side.
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Old Oct 20, 2012 | 11:44 PM
  #6  
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Car: 92 T/A 'vert
Engine: Mild .040 over L98 4 bolt mains
Transmission: Mostly stock 700R4, 2600 Vigilante
Axle/Gears: LS1 3.42
Re: Bad Luck (broken bolt)

Odd. None of mine were blind holes on Ed's kit.
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Old Oct 20, 2012 | 11:52 PM
  #7  
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Re: Bad Luck (broken bolt)

Sometimes it just happens.

Better that it broke now, than right behind a school bus or something.

Definitely do check to make sure it's not bottomed though, so you don't (a) have it happen again, or (b) reach full torque before it's actually holding the pieces together.
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Old Oct 21, 2012 | 12:18 AM
  #8  
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Re: Bad Luck (broken bolt)

Originally Posted by actarnoff
It was a 14mm head, I'm not sure what pitch it was. His instructions specified 75 ft lbs, which the bottom bolt did, but the top just sheered. I'm thinking it's because the top bolt bottoms out in the hole as opposed to the bottom one which has a hole on the other side.
Strange. The head marking on that bolt suggests its a grade 8 bolt which suggests it is SAE. So I don't see how its possible that it has a 14mm thread. Instead I suspect its a grad 8 7/16-20 bolt. That would normally have a torque spec of 75ft lbs dry.

Did you put any lubricant or thread lock on the bolt?

Definatley make sure the bolt isn't bottoming out.
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Old Oct 21, 2012 | 12:31 AM
  #9  
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From: Los Angeles
Car: 1991 RS/B4C clone
Engine: 355 TPI
Transmission: Probuilt Street/Strip 700r4
Axle/Gears: 7.625 axle with 3.23 gears/TrueTrac
Re: Bad Luck (broken bolt)

Even if the bolt DOES bottom out, which is just my theory so far, should grade 8 bolts handle 75 ft lbs of torque?
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Old Oct 21, 2012 | 01:01 AM
  #10  
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Axle/Gears: factory stock
Re: Bad Luck (broken bolt)

Originally Posted by actarnoff
Dude, you are a huge effin' stud. In my frustration, I didn't think of the most simple solution. I owe you a beer.
Hope it goes as easy as it sounds!! I had a couple Long Islands : )
Couple weeks ago I broke some fender bolts on " the other " car. I had to heat them a bit with a lil propane torch then did the vice grip thing. Worked out good-- home it goes ok for you-- good luck
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Old Oct 21, 2012 | 01:42 AM
  #11  
actarnoff's Avatar
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From: Los Angeles
Car: 1991 RS/B4C clone
Engine: 355 TPI
Transmission: Probuilt Street/Strip 700r4
Axle/Gears: 7.625 axle with 3.23 gears/TrueTrac
Re: Bad Luck (broken bolt)

Originally Posted by t-top havoc
Hope it goes as easy as it sounds!! I had a couple Long Islands : )
Couple weeks ago I broke some fender bolts on " the other " car. I had to heat them a bit with a lil propane torch then did the vice grip thing. Worked out good-- home it goes ok for you-- good luck

Yep, it worked like a charm!
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Old Oct 21, 2012 | 03:27 PM
  #12  
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Car: 92 T/A 'vert
Engine: Mild .040 over L98 4 bolt mains
Transmission: Mostly stock 700R4, 2600 Vigilante
Axle/Gears: LS1 3.42
Re: Bad Luck (broken bolt)

Originally Posted by 87350IROC
Strange. The head marking on that bolt suggests its a grade 8 bolt which suggests it is SAE. So I don't see how its possible that it has a 14mm thread. Instead I suspect its a grad 8 7/16-20 bolt. That would normally have a torque spec of 75ft lbs dry.

Did you put any lubricant or thread lock on the bolt?

Definatley make sure the bolt isn't bottoming out.

IIRC, mine were a metric/Allen head capscrew. But, it was 2 years ago and I'm borderline senile.
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Old Oct 27, 2012 | 11:55 AM
  #13  
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Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
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Axle/Gears: 9-bolt 3.70
Re: Bad Luck (broken bolt)

I managed to bottom out a metric 10.9 bolt on my setup. Fortunately ace hardware had a replacement bolt I was able to use of the same size/grade. Had to laboriously drill it out with bigger and bigger drill bits until it crumbled. Avoid that at all costs, but if you have to drill it out you can. It will chew up the drill bits but as long as you dont force it, you will make slow, steady progress.
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