This text presents the principles and practices of engine rebuilding, engine theory and in-the-vehicle service in a clear, concise format. Each chapter makes clear connections between theory and servicing, opening coverage with technical material, then moving into diagnosis, troubleshooting and service procedures. The Fourth Edition has been both updated and streamlined to reflect the latest engine developments, techniques and terminology in the field and make learning even more accessible. Features tools, engine operating systems, diagnosis, complete coverage of engine parts and functions, engine assembly and installation and in-vehicle service.