[Fot] Stripped Threads - RHS rear corner of block

[Bill Babcock]

I have helicoils in all the short bolt studs holes on most of my  
engines--I do it to the outer four as a matter of practice, since the  
they tend to have cracks leading into the pushrod tunnels or  
elsewhere. Greg Solow has slightly longer studs available with longer  
threads that require a little drilling and using a bottoming tap on  
the existing hole. One of my engines has these as well as helicoils.  
The Helicoils WILL handle the torque, but in the future I will use  
Timeserts,  or keyserts, or any of the solid thread repair options. I  
like the look of the time serts best, but they require the most  
tooling. Keyserts are very good and they won't turn out. You use a  
standard tap for them in the smaller sizes, I'm not sure what they use  
for 1/2 inch, I'd suspect 9/16 but it might be something odd like 17/32"


On Aug 10, 2009, at 10:19 AM, Don Elliott wrote:

>      A good friend here in Montreal is re-building the engine for  
> his TR3A (used for touring) and found that the threads in the top of  
> the block where the rear RHS head stud is supposed to secure the  
> head has been stripped of its threads.
>
>      He would like to know what is the best option to solving this  
> problem. He is concerned that a heli-coil may not take the torque.  
> Also a larger stepped stud, specially manufactured means a larger  
> threaded hole in the block (like the heli-coil as well) and he is  
> concerned that he may hit a water passage with both of these options.
>
>      Any proven suggestions ?
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