This manual covers the Mitsubishi S12A2, a V-type, 4-stroke marine diesel engine with a 12.0 L displacement and 12 cylinders, designed for marine propulsion. Engineered by Mitsubishi Heavy Industries, Ltd., this engine is built for reliability and performance in demanding marine environments. While specific horsepower and torque vary by model variant, such as the S12A2-MPTA and S12A2-STTA, the core design emphasizes robust construction and efficient operation on diesel fuel.

The purpose of this Operation and Maintenance Manual is to provide comprehensive guidance for the proper operation, maintenance, and servicing of the Mitsubishi S12A2 engine. It details essential information including recommended service intervals, lubrication requirements, and inspection schedules. This manual serves as an indispensable resource for owners, operators, and technicians, enabling them to ensure the longevity, optimal performance, and safe operation of their marine diesel engine.