learning to work on engines?
All right. We donít know whatís wrong with the engine. It could be as simple as replacing the plugs or it could be that the thingís a complete pile of rust. I doubt youíll find any crash course that will teach you what youíll need to know to handle every possibility in the allotted time frame. But local high schools usually offer adult education courses. You may be able to find a course that can give you a good overview of your motor, which is something all sailors should have anyway.
Even bolstered with information about motors, you may want to purse another option. A stout skiff with a strong outboard would act as a good yawl-boat to get you home, or at least into a more accessible location to get your motor serviced. Itís not that great of a deal as youíll need the skiff anyway and having one that you know will do the job should the need again arise, will be a comfort.
Good luck and happy sailing!