Hi Ned, Theo, I have a MkII 1981 Nauticat with the Ford Lehman 80hp engine. I located the drain on the port side of the engine at the rear of the engine it is tucked under the curve of the engine casing. The drain has ‘wings’ so that you might be able to undo it by hand. I found it from the Nauticat diagrams I have for the boat rather than the engine manual. Hope that is helpful.