Cast Iron Drain Problem

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I imagine bees wax would work, worked on the joints.
Solder may work too. the only downside I can think of is if that pinhole isn't real clean the junk in there may contaminate the solder and it wouldn't stick. Don't know that for a fact, just thinking out loud.
 
If it's just a pin hole, a small diameter drill to clean out the hole, then solder. We use to heat lead to make the joints at floor level, guess it'd stick to a small hole.
 
If it's just a pin hole, a small diameter drill to clean out the hole, then solder. We use to heat lead to make the joints at floor level, guess it'd stick to a small hole.

With a cast iron engine, you drill a hole tap with a pipe thread and install a pipe plug. for a crack you over lap the plugs.
 
Just use JBweld and be done. I had a lawn mower that ran for 20 years after patching a hole in the side of the crank case with epoxy after it threw a rod.
 
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