[W126 Coupe] Broken bolt

[Dick Spellman]

David:

You need to run down to a Sears store and pick up a bolt extractor kit 
of a diameter less than the wheel bolt so as to not damage the threads.  
The kits have a drill bit followed by an extractor that will permit the 
bolt fragments removal if done right.

Or reassemble the wheel with just 4 bolts and torqued to factory spec of 
80 ft lbs only.  Run it up to a local garage and ask they remove the 
damaged lug bolt.

All the wheel bolts should be inspected if this happened from being on 
there way too tight by some mechanic that used say an air tool without 
regard for the torque.  Replace any that use the long stem with the new 
MB bolt version available at the local MB dealer.  These extension bolts 
on the 15 hole wheels have been done away with because they do snap and 
represent a safety issue too.  So, if that's what you've got, get the 
updated bolt from MB.

Was this the front rotor or the rear wheel hub where the bolt cracked?

Dick

David King wrote:

>  

> I need some help with a broken wheel bolt on a 1990 560 SEC.  The last 

> 1/2 inch fractured at a nasty angle and I'm not sure what to do? Any 

> ideas.

> Dave

> David A. King, PE&LS

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