This manual covers the YANMAR SVE8 and SVE12 Marine Diesel Engines, designed for reliable marine propulsion. These engines represent YANMAR's commitment to engineering excellence, offering robust performance and durability for demanding maritime applications. Their specialized design ensures efficient operation and longevity, making them a trusted choice for boat owners and operators seeking dependable power solutions. This comprehensive Operation Manual provides essential information for the safe and effective use of your YANMAR marine diesel engine. It details critical operational procedures, including starting, monitoring during operation, and stopping, along with air venting instructions. Furthermore, the manual thoroughly covers maintenance and inspection schedules, periodical checks, and specific adjustments, such as the fuel-injection regulator. Handling precautions are also included, empowering owners and technicians to maintain the engine's optimal performance and extend its service life, ultimately saving costs on repairs.