[W126 Coupe] Broken bolt

[Dick Spellman]

Hi David:

I sure do not want to tell you how to get that rotor off with wheel and 
caliper attached as I have never had to do this kind of repair.

I'd ask your local mechanic if he can drill that stud out from the front 
of the wheel or if he has a recommendation on pulling the hub and all 
with wheel attached which now that I have thought about it is NOT 
LIKELY.  You've got the wheel decorative center cap, then the bearing 
cap, then the outer bearing lock with /side mounted/ locking screw.  
Perhaps there is a way to raise the car up, remove the gravel shield and 
spin the hub to where you can access that stud from the back with 
everything still attached.

Really best to go hat in hand to a mechanic that's been there done that 
unless someone on the list has had the pleasure of fixing this kind of 
thing.

Dick

David King wrote:

>   Dick,

>   As luck would have it the brakes were due for changing several days before

> yesterdays ago.  Can you pull the front hubs off without removing the front

> caliper first?

>   Dave

>   David A. King, PE&LS

>   A2 Maps & Surveys

>   627 Norwich Road

>   Oakdale, CT 06370

>   Ph. (860) 889-5905

>   Fax (860) 889-5942

>   http://www.A2Maps.com

>   ----- Original Message ----- 

>   From: "Dick Spellman" <spell.yy at verizon.net>

>   To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>

>   Sent: Friday, August 31, 2007 4:51 PM

>   Subject: Re: [W126 Coupe] Broken bolt

>

>

>   > So David, seeing as how it's a front rotor, when are the rotors (brakes)

>   > due to be replaced?  If soon, just order them up with pads and senders

>   > and leave the old bolt. If the rotors are fairly new, you can do the

>   > repair on the vehicle only if the break is right up near the rotor or

>   > remove the troubled rotor set it on a bench and drill the stud out from

>   > the back side followed by judicious use of the extractor.  Then repack

>   > the outer wheel bearing, check the inner seal and replace the rotor.

>   >

>   > Good luck and your welcome!

>   >

>   > Dick

>   >

>   > David King wrote:

>   > > Mr. Spellman,

>   > > Thanks for the info.

>   > > It was a front left side bolt. It sheared near the head and left sharp

> point

>   > > offset to one side.

>   > > Dave

>   > >

>   > > David A. King, PE&LS

>   > > A2 Maps & Surveys

>   > > 627 Norwich Road

>   > > Oakdale, CT 06370

>   > > Ph. (860) 889-5905

>   > > Fax (860) 889-5942

>   > > http://www.A2Maps.com

>   > > ----- Original Message ----- 

>   > > From: "Dick Spellman" <spell.yy at verizon.net>

>   > > To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>

>   > > Sent: Friday, August 31, 2007 2:50 PM

>   > > Subject: Re: [W126 Coupe] Broken bolt

>   > >

>   > >

>   > >

>   > >> 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

>   > >>> A2 Maps & Surveys

>   > >>> 627 Norwich Road

>   > >>> Oakdale, CT 06370

>   > >>> Ph. (860) 889-5905

>   > >>> Fax (860) 889-5942

>   > >>> http://www.A2Maps.com

>   >

>   

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