3 Auto Engine Repair will help you learn to diagnose and rebuild all makes and models of gasoline engines. The text will prepare you to use factory service manuals and speci- fications to complete competent engine service and repair work on any gasoline engine found in today’s cars, vans, SUVs, and light trucks. This book has been revised and reorganized to help you pass the ASE certification test on engine repair. The engine repair test primarily includes questions on how to troubleshoot, repair, and rebuild passenger vehicle engines. Automobile manufacturers are now using advanced engine designs to improve power, efficiency, and depend- ability. Today’s cars and light trucks are equipped with computer-controlled high-performance 4-, 6-, 8-, 10-, and 12-cylinder engines. Many engines have three or four valves per cylinder, overhead camshafts, aluminum heads, alu- minum blocks, turbochargers, superchargers, plastic parts, and many other engineering advances. This textbook was written to help you understand and service engines with these challenging innovations. The 26 chapters in Auto Engine Repair are grouped together into six areas of study. Chapters 1 through 5 review the fundamentals of engine operation, equipment, and safety. Chapters 6 through 11 detail engine construction and design so you will know how engines are supposed to oper- ate and how they are manufactured. Chapters 12 through 16 summarize the theory and service of engine-related systems. To be a competent engine technician, you must understand and be able to service starting systems, ignition systems, fuel systems, emission control systems, diesel injection sys- tems, turbochargers, and more. The ASE engine repair test includes questions on engine support systems. Chapters 17 through 18 explain how to diagnose both mechanical and performance problems. Chapter 19 summarizes engine tune-up procedures. Chapters 20 through 24 cover the overhauling or rebuilding of engines. Chapters 25 and 26 summarize ASE certification tests and career success. Auto Engine Repair is written so you may study the chapters in the sequence presented or concentrate on cer- tain topics. The chapters are small and cover specific engine assemblies or related subjects. Cross-references help you find additional information elsewhere in the book. Each chapter begins with learning objectives, which emphasize the important topics you will study in that chapter. A summary is provided at the end of the chapter to help you review the most important concepts. The review questions at the end of each chapter allow you to measure your progress. ASE-type questions are also provided at the end of the chapter to help you prepare for certification. Auto Engine Repair was developed to help you become a professional engine technician as quickly as possible. Since engine repair is very technical and precise, the book was writ- ten using short, easy-to-understand sentences accompanied by carefully selected illustrations. Color photos and line drawings have been used to illustrate as much as possible about engine repair. Technical terms are printed in bold italic and defined so you can quickly learn the “language” of an engine technician. Chapter 5 provides general information about shop safety. Additional instruction regarding safety is stressed throughout the book. You can never know too much about safety. There are three types of special notes you will encounter in this book: Note: A note may highlight important technical information, present information related to the topic, or cross-reference the material. Caution: A caution identifies a situation that may result in damage to the vehicle, tools, or equipment if the proper procedure is not followed. Warning: A warning identifies operations that may potentially result in injury. Specific repair procedures are presented in a sequen- tial, step-by-step list. This allows you to easily follow the procedure as you perform the operation. Auto Engine Repair is a valuable guide to anyone want- ing to understand or work on today’s engines. It will help a student enter the trade more easily, but it will also help the vehicle owner know more about the operation and servicing of engines. An experienced technician can also benefit from this text by using it to become better informed about the latest engine technology and repair methods. —James E. Duffy Introduction