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  #1  
Old 01-08-2004, 05:18 AM
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Broken lug bolts on 1994 C220. Has anyone ever heard of this?

A good friend of mine called me and said three of his lug bolts broke off his rear wheel. He torqued them to spec when he put the wheels on. What would cause this? They are sheared off clean in the hub.

Is there any way to get these out or is it time for him to buy a new hub?

TIA,
Steve

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  #2  
Old 01-08-2004, 06:46 AM
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Time to get a new torque wrench? Hard to see why three bolts would shear at the same time if they were correctly torqued.

If properly installed, it is only the loading created by the wheel that holds these bolts tight. With the wheel off and the load off the bolts, they should come out pretty easily, perhaps with an easyout, our use a punch to drive them round.
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  #3  
Old 01-08-2004, 08:47 AM
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The threads may not have been clean when torqueing the bolts.
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  #4  
Old 01-08-2004, 09:51 AM
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Corrosion/lack of thread lubricant?
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  #5  
Old 01-08-2004, 12:50 PM
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use a reversed drill bit to get them out, that could work too.

xp
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Old 01-08-2004, 01:18 PM
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They were possibly already damaged due to previous overtorqueing by monkeys with impact wrenches. One more cycle and pooof.

Duke
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  #7  
Old 01-08-2004, 04:30 PM
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Overtorqued bolts would show up with necking at fracture.
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Old 01-08-2004, 07:06 PM
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What is necking?
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Last edited by d2bernhard; 01-08-2004 at 07:38 PM.
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Old 01-08-2004, 07:08 PM
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Quote:
Originally posted by d2bernhard
Waht is necking?
Boy & girl, in the backseat of a car !
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  #10  
Old 01-08-2004, 08:23 PM
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"Necking" in regard to bolts is the reduction in diameter

at the point of the break, caused by the stretch of the bolt when overstressed. Necking in the back seat of the car, on the other hand, often results in an _increase_ in the diameter of the midsection of one of the participants, some months later.
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  #11  
Old 01-08-2004, 11:00 PM
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Ask your tool supplier for an Ultra-sonic bolt releasing tool kit, works like a jiffy every time!! It mounts to the wheel and uses sound waves to slowly deteriorate the corrosion around the lug threads, allowing you to remove the broken studs with a simple pair of pliers.
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  #12  
Old 01-11-2004, 09:21 PM
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Thanks for all of your responses. On Friday, we pulled the hub carrier off the car so we could put the new bearing and hub on it. As I was reading on this site, most of the hub assemblies need to be checked with a dial indicator after assembly. Is it necessary to do this with the W202? Is there a crush washer that needs to be set to spec.? Can it just be put back together and torque the new bearing in with the axle shaft and the job is complete?

Thanks again,
Steve
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  #13  
Old 06-27-2006, 04:10 AM
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looking for supplier

Quote:
Originally Posted by M.G.
Ask your tool supplier for an Ultra-sonic bolt releasing tool kit, works like a jiffy every time!! It mounts to the wheel and uses sound waves to slowly deteriorate the corrosion around the lug threads, allowing you to remove the broken studs with a simple pair of pliers.
Can you give any more info about this tool kit? I have 8 seized wheel studs and could certainly use a tool like that

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