TheEngine Maintenance course has been put into a ten chapter course that stresses the diagnosis of modern systems, while also teaching the basics of engine layout and operation. Gasoline inboards, and diesel engines are taught in a way that reinforces the common aspects of how engines work. The Engine Maintenance course covers those repairs that do-it-yourselfers can perform, teaches how to diagnose problems that might be beyond your ability to fix, and how to share that information with your mechanic so the right repairs are performed.