Peter H wrote:
>
> Hi Group: Hope someone here can help me with this question.
>
> I've got a minor leak in my exhaust manifold of my 2000 civic. I'm
> wondering whether I'm doing my motor any harm by not having it repaired
> right away. It doesn't seem to be affecting performance in any way, but
> I've been told by a mechanic that it's there and I think I can hear it.
>

The potential for damage depends on where the leak is located. If the leak
is at the junction of the manifold to the head, then the leak should be
fixed promptly. Exhaust leaks at the manifold gasket have the potential to
damage the flange sealing surface on the aluminum cylinder head. I
witnessed this on a car owned by someone I know. He drove around with a
very distinct sounding exhaust leak for several months. By the time he got
around to replacing the manifold gasket the head had already been damaged
and a new gasket made no improvement. If, however, the leak is from the
exhaust manifold itself, then driving around with it for a little while
might not be too offensive. It would be best to closely evaluate where
exactly the leak is coming from and proceed appropriately.

Eric