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I've found on Passenger Side, the aft lower Exhaust Manifold Stud is Broken,
and there is a slightly Exhaust leak. (i hear it, because i know it)
The Stud is NOT Flush with the Head, but flush with the Flange.
Today i tried to drill them out, but no chance.
first of all, its nearly impossible to reach the Stud with a drill bit.
i've made it with the "Dremel" and a 90° gear, an a brand new 3mm HSS Drill.
I've only scratched and made a little tiny Crater.
but this Stud is such hard....
then i have tried a smaller one with carbide edges. (but not new)
And finally i tried to open the other Studs, to remove the Flange, no way,
The Flange looks pretty good but the Nuts and Studs are corroded.
I don't want to remove the Head, because, its hard and very expensive to get Parts here in Europe.
i've removed the RH Exhaust Manifold, because of Leaking and broken Stud.
Found a second broken stud (Nut was held only by rust)
I could remove all broken Studs and the good Studs, except one.
I've retreaded them. (i think i let em in)
And i've found a Crack at the Exhaust manifold between 3th and 4th cylinder.
tomorrow, i'll buy some studs and Nuts, and then i try to reassemble it.
(it is not easy to TIG weld Casted Iron, but it's possible, with much cleaning and preheating)