This book explains how a diesel engine works and how the auxiliary systems for fuel, oil, coolant, electricity, as well as transmission, shaft, and propeller function, using numerous photos and easily understandable illustrations. It also addresses the most frequently asked questions from skippers and clearly describes the most important maintenance tasks and emergency tips for everyone. The individual topics are covered in the following chapters: - Operation of a diesel engine - Fuel - The air system - Engine cooling - The electrical system - Lubrication - Propulsion - Engine control - Starting and stopping the engine - Diagnosis and troubleshooting - Maintenance tasks - Emergency situations. The diesel engine is considered the most reliable propulsion system for yachts. Typically installed in a space-saving manner under the cockpit, it is the steel heart of many sports boats. With this book, you can prevent trouble and ensure smooth operation.