本文将系统地介绍卡特彼勒(Caterpiler)3408PC和3408DI发动机各系统及主要零部件的故障诊断、维修方法和重要零件尺寸。而且对系统进行了必要的说明。对于一个工程技术人员,发动机的调试、维修是其知识结构的一个组成部分。对发动机系统的全面介绍及文中所记录的零件尺寸公差,都会对发动机设计有所帮助。同时本文所介绍的发动机调试及维修方法与步骤,对其它机型也是适用的。 This article systematically describes troubleshooting and repair methods and key part dimensions for each system and major components of the Caterpiler 3408PC and 3408DI engines. And the necessary instructions for the system. For an engineer, the commissioning and servicing of the engine is an integral part of its knowledge structure. A comprehensive introduction to the engine system and the part size tolerances documented in the article will all help with engine design. At the same time this article describes the engine commissioning and maintenance methods and procedures for other models are also applicable.