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I've got four of them that's broken.Two already breaks;and two at themontage barely touched.;I drilled in the center to extract.ON TOMBE DIRECTEMENT IN THE CHAMBRE. At reassembly put the filet andancheness otherwise.....
Some say if its not broke leave it alone. However if you have a lot of studs already broken the remaining studs probably wont last long. You have to decide. The inlet manifold has a long gasket and also a smaller gasket where the exhaust gas flows inside the inlet manifold. Best if both gaskets are the same type and thickness. Geoff is correct. It is possible but you will find its easier to take both manifolds off especially if you have to face the ex manifold. New gaskets should mean no leaks. Good luck
No broken studs, thankfully.
It seems my problem is around the rearmost stud on the exhaust manifold and its gasket - not the intake manifold as I originally thought. That one visually looks OK.
I've got a greasy, sooty streak below that last stud on the exhaust manifold and oil weeping out of the top of the nut on that stud.
It would be great if I could avoid disturbing the inlet manifold as it might only cause more leakage problems if I do.
At the moment, I've just taken all the nuts of all the studs on both manifolds and have done nothing more than try to wiggle them with hand pressure and nothing has moved - so, hopefully, no damage done in that direction - to either the manifolds or existing gaskets.
I'd like to torque up the inlet manifold nuts and concentrate on getting only the exhaust manifold off.
But I will wait to get the OK to that course of action (or an alternative one you may suggest) from you experts, please, before attempting anything further.
The exhaust manifold was a new casting from the ROC that I put on after I got the engine back from its rebuild and it's going to be an expensive mistake if I damage it !
Thanks to everyone for the advice.
I've just bought some J-B Weld thread and stud lock.