Forgot to mention there is another gasket/O-ring between the pump housing parts that could leak. Mine leaks on the side every Spring but it could leak out the bottom too. So far I've just retorqued the 4 bolts and it stops. This year the ring is so squashed it wouldn't stop leaking so I got a new ring this year but haven't installed it yet. Only a drip or two until the motor heats up a little. Also, there are no brushes in these motors. Just a centrifugal switch for starting.
Al