Despite the high cost, diesel engines are becoming increasingly popular due to the low price of oil, their robust design, their compatibility with gasoline engine maintenance and repair equipment, and their ability to keep emissions within prescribed limits. More and more often, craftsmen have the opportunity to repair a diesel engine. Specialized craftsmen are very few but have extensive experience in repairing and adjusting these engines. However, there are also the unskilled, who fortunately are even fewer, and who, with their ignorance, create serious problems for the engines and great inconvenience and expenses for the customers. [...] (from the preface)