This manual covers the Caterpillar 6D16 Series Diesel Engines, including models DP80, DP90, DP100, DP115, DP135, and DP150. These engines are engineered for robust performance and reliability, making them suitable for a wide range of demanding industrial and commercial applications. Their design prioritizes durability and efficient operation, ensuring consistent power delivery across various operating conditions. This comprehensive service repair workshop manual provides all necessary information for the maintenance, servicing, and repair of the Caterpillar 6D16 Series engines. It includes highly detailed procedures, hundreds of pages of content, detailed photos, diagrams, and exploded views to assist professional mechanics and technicians. The manual covers all repairs, troubleshooting, and technical specifications, enabling efficient and accurate upkeep of the engine.