This service repair manual covers the Caterpillar 3208 Engine, a diesel engine with a 6.6 L displacement and a power output typically ranging from 165 to 205 hp, designed for application in the 613C Wheel Tractor. The engine is known for its robust engineering and reliability, making it a dependable component for heavy-duty operations. This manual provides comprehensive information to ensure optimal performance and longevity of the engine. The purpose of this manual is to provide detailed guidance for maintenance, diagnosis, and repair of the Caterpillar 3208 Engine. It includes diagnostic procedures, repair and rebuilding instructions, and electrical service procedures with wiring diagrams. The content is presented with detailed sub-steps, numbered instructions, bold figure numbers, and numerous illustrations, drawings, and photos, including enlarged insets for clarity. This resource is intended for owners, mechanics, and technicians to facilitate effective upkeep and repair of the engine.