Hi there,<br /><br />I have a 1963 40hp Evinrude Lark. I changed the gearcase fluid about a month ago with the high grade OMC stuff. I did not replace the nylon washer on the drainplug, as it looked really new. I noticed today that the gearcase was leaking from a small hole on the underside of the cavitation plate. The fluid was milky indicating the presence of water. The hole is just starboard of the middle and just forward of the exhaust port(or whatever that is). <br /><br />What is this hole? Have you all run into this before? is this an overflow or is it something else?