Re: broken bolt in exhaust manifold
While these can be a real bugger, I can't believe a professional tech would
let a scrubby little chunk of bolt win (though extracting things like this
can approach an art form). Since these heads are aluminum, I hope they
haven't left a real mess in their wakes....
They "usually" break with a bit of stud sticking out from the head... with
these, the easiest course is to weld a nut to the prtusion, allow everything
to cool (we must be able to touch it with bare hands) and the nub generally
comes out quite easy. If the previous attempts have left something unusable,
It will have to be cut flush and drilled out.... The drill must be centered
in the studand it must be drilled all the way through to avoid further
If they have already tried drilling it and botched that up, I'd need to see
it but there may be a head gasket in someones future if this is the case. It
would be much easier to remove the head and install a helicoil or
thread-sert in a case like this.
FWIW, these do break of on occasion... they appear to start breaking at the
rear of the manifold and can progress until several are broken. If I find
one broken stud, all the studs on that side get changed...
<email@example.com> wrote in message
> I have an exhust leak due to a broken bolt in the exhaust manifold in
> my 2002 expedition (5.4). I've taken it to two garages and both places
> could not get it out. Does anyone have any advice?