<VV> Pulled head stud Woes

[BEllison@bbafiberweb.com]

Thanks to Seth, Jim Davis, and Ed, for the off-list advice on pulled head
studs, and roller rocker adjustment.

My head stud pulled, before I put hardly any torque on it at all, during my
first round of tightening.  This being the 2nd,I may have others.  Seems the
block itself may have been compromised/overheated.

Barry
 


> -----Original Message-----
> From: James Davis [mailto:jld@wk.net] 
> Sent: Monday, March 08, 2004 10:35 AM
> To: BEllison@bbafiberweb.com
> Subject: Fwd: RE: <VV> Pulled head stud Woes
> 
> 
> 
> >
> >Sorry once the aluminum has yielded, it is not recoverable.  
> There is a
> >reason there are no aluminum springs.  Steel stretches 
> easily and returns 
> >to its original shape (a high modulus of elasticity), where 
> as aluminum 
> >doesn't.  If you want to save the crankcase you should 
> repair all the 
> >threads.  There are at least two ways. one is to use 
> oversize studs (the 
> >GM way) and the other is to use thread inserts (most 
> reliable if done 
> >properly).  I would spend the money and buy (rent the 
> Time-Serts insert 
> >tool and inserts from someone (Clark's)) and do all th 
> threads.  Don't 
> >forget to chase the studs with a die (course threads) before 
> installing them.
> 
> 
> 
> 
> 
> >At 09:01 AM 3/8/2004, you wrote:
> >>I'm not aware of the engine overheating.  I've never lost a 
> belt, and I
> >>probably had <2000 miles on the car when the smoking started.
> >>
> >> From what you describe, I must have overtorqued them on 
> the first install.
> >>I used anti-seize, and torqued to 35-38lbs (it's been two 
> years, so I don't
> >>remember).  Then when I ran it, it was too much for the 
> threads.  Did I say
> >>that right?
> >>
> >>Are you saying you can undo the damage to the threads from 
> over torqueing,
> >>by heating the block?
> >>
> >>I definitely think I'll pull the other head off, carefully, 
> using vise grips
> >>to stop the headstuds from pulling out, and retorque with 
> lower settings.
> >>Sounds like it would be worth it, or I'll head down the same path.
> >>
> >>Thanks,
> >>Barry
> >>
> 
> 
> 
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