Exhaust manifold studs Q

[peter@thescirocco.com (Peter)]

-----Original Message-----
From: scirocco-l-admin@scirocco.org
[mailto:scirocco-l-admin@scirocco.org] On Behalf Of Marc scirocco =
Qu=E9bec
Sent: Saturday, June 22, 2002 10:00 PM
To: Peter
Cc: scirocco-l@scirocco.org
Subject: RE: Exhaust manifold studs Q


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

Stainless isn't any harder than the stock hardened studs...

I'd try a new drill bit first...=20
Sometimes they loose their edge before you can get them all drilled out.

Pete


 --- Peter <peter@thescirocco.com> a =E9crit : >=20
>=20
> -----Original Message-----
> From: scirocco-l-admin@scirocco.org=20
> [mailto:scirocco-l-admin@scirocco.org] On Behalf Of Marc scirocco=20
> Qu=E9bec
> Sent: Sunday, June 16, 2002 8:46 PM
> To: scirocco-l@scirocco.org
> Subject: Exhaust manifold studs Q
>=20
>=20
> Here it is, I am about to install this 4-2 exhaust
> manifold.
>=20
> Now, 3 of the old studs are out, no problem. The 3
> remaining studs broke, with nothing to grab them.
>=20
> 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.
>=20
> 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...
>=20
> Anybody has done something similar in the past? Any suggestion?
>=20
> Cheers.
>=20
> Marc
> '83 Scirocco
> '88 Scirocco Slegato
>=20
> 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.
>=20
> 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.
>=20
> Peter
> =20

__________________________________________________________
L=E8che-vitrine ou l=E8che-=E9cran ?
magasinage.yahoo.ca

_______________________________________________
Scirocco-l mailing list
Scirocco-l@scirocco.org http://neubayern.net/mailman/listinfo/scirocco-l