Exhaust manifold studs Q

[marc_scirocco@yahoo.ca (Marc scirocco Québec)]

Heli-coils went in for two of the holes. Now the last
son of a b***h looks like it is a stainless steel
stud.

Titanium drill bits did nothing. Cobalt drill bits
with four points did nothing. Lots of cutting oil, low
speed (+-200RPM), high pressure, and I am down into
the stud about 1/16 of an inch.

Any ideas? A machine shop?

Cheers.

Marc
'83 Scirocco
'88 Scirocco Slegato

 --- Peter <peter@thescirocco.com> a écrit : > 
> 
> -----Original Message-----
> From: scirocco-l-admin@scirocco.org
> [mailto:scirocco-l-admin@scirocco.org] On Behalf Of
> Marc scirocco Québec
> Sent: Sunday, June 16, 2002 8:46 PM
> To: scirocco-l@scirocco.org
> Subject: Exhaust manifold studs Q
> 
> 
> Here it is, I am about to install this 4-2 exhaust
> manifold.
> 
> Now, 3 of the old studs are out, no problem. The 3
> remaining studs broke, with nothing to grab them.
> 
> I drilled 2, one of them is gone now, but the
> threads
> are shot... And I am sur that it will be the same
> thing for the remaining 2 studs.
> 
> At this stage, I do not care if the new studs ever
> come out again, so I am thinking about drilling a
> hole, and welding/gluing the remaining 3 new studs,
> JB
> weld, or something similar...
> 
> Anybody has done something similar in the past? Any
> suggestion?
> 
> Cheers.
> 
> Marc
> '83 Scirocco
> '88 Scirocco Slegato
> 
> Using 8mm x 1.25 Heli-coils is how I would fix it.
> The kit comes with a tap for the steel coil threads,
> you drill the
> 21/64" hole, run the tap through, the key to tapping
> cast iron is back
> and forth, back and forth, in very small steps, you
> thread in the thread
> coil and you are done.
> 
> The tough part is drilling the hole in the center of
> the broken stud.
> A small 1/8" pilot hole in the center of the broken
> stud is a good start
> and a drill press doesn't hurt.
> 
> Peter
>  

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