This book is written according to the curriculum reform thought of the integration of theory and practice in vocational education. The content is organized with the project as the unit, and the actual work task is introduced into the teaching material with the work task activity as the carrier. The teaching process strictly follows the maintenance manual and the operation process of the 4S shop, adheres to the integration of "e;teaching, learning and doing"e;, cultivates students'' professional awareness. Through the cooperation between schools and enterprises, the engine types of common models are summarized and selected, and a certain number of teaching projects are designed. Through these limited and representative typical cases, students can master the knowledge of automobile engine structure and disassembly and assembly skills as soon as possible. The contents of this book include 8 typical projects: the cognition of engine assembly, the cognition and disassembly of ignition system , the cognition and disassembly of starting system, the knowledge and disassembly of the lubrication system, the knowledge and disassembly of the fuel supply system, the recognition and disassembly of cooling system, the recognition and disassembly of valve train, and the recognition and disassembly of crank connecting rod.