This manual provides comprehensive information for the Mack E7 Truck Engine, part of the E7 Series. This powerful diesel engine is an inline 6-cylinder unit with a displacement of 11.1 liters (677 cu in). It features direct injection, a water-cooled system, and forced lubrication. The E7 engine is known for its robust construction and is typically turbocharged and intercooled, delivering a horsepower range of 250-450 HP and torque from 850-1450 lb-ft, depending on the specific application. Its engineering is designed for demanding heavy-duty use, emphasizing reliability and performance in commercial vehicle operations. The purpose of this Workshop Repair Service Manual is to guide users through the complete overhaul of the Mack E7 Truck Engine. It covers all essential aspects necessary for engine maintenance and repair, including detailed procedures, technical specifications, and system component information. This manual is an indispensable resource for owners, mechanics, and technicians, providing the knowledge required to ensure the engine's optimal performance, longevity, and proper functioning. The content is presented in English to facilitate understanding and application of the repair and overhaul processes.