The main purpose of the book is to provide the beginners in the automotive field with a thorough knowledge of the construction and operating principles of the modern automobiles. In addition to detailing and stressing on the fundamentals of automobile theory, the book provides to the students and the automobile engineering persons with the necessary background for intelligent diagnosis, maintenance and repairs of different types of modern automobiles. The book also provides up-to-date methods of maintenance and repair as well as text to serve the needs of the students and helps to upgrade the skills of those already employed in automobile field for understanding, maintaining and repairing of modern automobiles. The objective of writing this book has been to present the various aspects of Automobile Engineering in a simple language, a most graspable and lucid manner. To aid in visualization, clear, simple illustrations have been provided wherever necessary. To keep it within the easy reach of the engineering students, Technocrats and working engineers. All the topics have been explained with practical examples wherever necessary. To appraise the students about the expected types of questions which can be asked in the examination important review questions have been provided at the end of each chapter.