Check out the courses offered to US Sail & Power Squadron members. They offer an Engine Maintenance course. Description below is from their site:
Description of Course:
This course attempts to make the student more self-reliant afloat by teaching high level "how it works" concepts, and by giving special emphasis to trouble diagnosis, temporary remedies and safety measures. Both gasoline and diesel engines are covered, as are key engine subsystems, including: propulsion systems, cooling systems,
fuel systems, lubricating systems, and power train systems. The course is open to all Squadron members. No prerequisites.
They also offer a course on Marine Electronics
Description of Course:
This course provides essential knowledge about your boat's electrical and electronic systems. Proper wiring, grounding, electrolysis control, and batteries and their maintenance are covered. Depth finders, marine
radio telephones,
radar, location systems such as
GPS and loran. Advanced systems for electronic charting and navigation are also studied. Information is provided on FCC requirements for station licensing and operator permits for
radio telephone. Open to all members. No prerequisites