This course focuses on cultivating students' comprehensive professional abilities in the maintenance of automotive engine mechanical systems as the core goal, with the diagnosis and maintenance process of the engine mechanical system as the main thread. It allows students to construct knowledge and exercise professional skills in their professional actions. In addition, the course also emphasizes on cultivating students' social and methodological abilities, enabling them to acquire the comprehensive professional abilities necessary for future work. The main content of the course is to explain the relevant knowledge of automotive engine maintenance. (1) The course content is mainly divided into nine parts: (2) Introduction to maintenance tools (3) Use of measurement tools (4) Preparation before engine maintenance (5) Disassembly and inspection of the engine block assembly (6) Detection of cylinder head flatness (7) Disassembly of the piston connecting rod assembly of the engine (8) Three-gap measurement of piston (9) Disassembly of valve group (10) Assembly of the engine