Antique cast iron sink leak
We are buying a 1930s house that has a huge cast iron sink in the basement that the washing machine drains into. The sink is leaking in between the sink and the pipe. We think there must be a leak into the actual cast iron bottom of the sink. The water leaks out of the sink itself, not the drain.
Is there any way to put in a new piece of pipe to line the part of the drain with a leak? It would only need to be 4" or so.