EM stud thread size? also welder EM stud removal?

Jim Green jeg1976 at yahoo.com
Tue Dec 24 08:17:09 EST 2002

--- auditude at cox.net wrote:
> Hey Everyone,
> Happy Holidays!


> What is the thread size for the exhaust studs on an
> MC motor?  I heard they were M8, but
> I'm looking at Time-serts, and they list them for
> M8x1.0 and M8x1.25.

Not sure right of hand, sorry

> I'm prepping the MC-1 motor I have for installation,
> and in the course of replacing the EM
> with a 2-piece, I found one cross-threaded stud, and
> three broken ones.  Actually there was
> one that I could get off double-nutting, so I will
> have to see what happens when I take the
> Vice-Grips to it.
> For those running KH intake manifolds, what did you
> do for the air shrouded injector port?
> Just block it off, or hook it up to a hose running
> to(?).

Hook it up to a pre-TB air source, don't block it off
unless your doing EFI, which you are right?

> As far as which way the EM gaskets should be (metal
> facing EM, I believe), I found this
> donor motor to have them every which way.  I think
> two were reversed.

Whichever way they fit, I don't think it matters which
side the metal is on

> I'm gonna try to yank the old motor out of the 4ksq
> sometime during the holiday break.  I got
> everything stripped off of it except for the
> downpipe, so it should actually occur.
> Anyway, regarding re-doing the threads on the head.
> Should I go ahead and drill out all of
> them and use a thread repair kit on them?  Or, just
> do the ones that are buggered?  I'm
> thinking do them all.

I would leave the good ones alone, just clean them
out, and helicoil the rest.  Don't use any type of
glue type thread repair

> As for the repair method, I did a spark plug hole
> with a Time-sert, and had good luck with
> that.  Anyone want to recommend a Helicoil over a
> Time-sert?  The difference being that a
> Time-sert is a solid bushing sort of a thing,
> threaded on both sides and held in place by the
> bottom of it being sort of swaged into the head.
> It's not epoxied in like some other solid
> inserts.

Let's just say my engine is held together by
helicoils, I love them.  I've never used a time-sert
so I can't vouch for them.  I think they are meant for
through holes where helicoil will not work, like spark
plug holes.

> I may try the mig-welder method of broken stud
> removal, if I need to.  Will the bead not stick
> to the aluminum, just because it's not ferrous and
> the wire is?  Is that how it works?

It woun't stick, but it may melt it , so you still
have to be careful.  Honestly , I've always had
machine shops deal with broken off studs if the heads
off the engine.  I usually just have them re-surface
the EM face, head, and remove any broken studs while
they are in there.


Jim Green
'89 90tq 034EFI, Haltech IG5

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