The YANMAR 6LY2-STE / 6LY2A-STP / 6LYA-STP Series represents a line of powerful and reliable marine inboard diesel engines. These engines are engineered for demanding maritime applications, featuring turbocharged and intercooled aspiration for enhanced performance. With a displacement of 6.57 liters, an in-line 6-cylinder configuration, and direct injection common rail fuel systems, they deliver robust power outputs ranging from 355 to 440 HP at 2300-2400 RPM. Their advanced design prioritizes durability and efficiency, making them a trusted choice for various marine vessels.

This service manual provides comprehensive guidance for the maintenance, repair, and technical understanding of the YANMAR 6LY2-STE / 6LY2A-STP / 6LYA-STP Series engines. It covers essential procedures including detailed maintenance schedules, fluid specifications, and capacities for engine oil and cooling systems. Technical specifications, troubleshooting information, and diagnostic procedures are also included to assist owners, technicians, and mechanics in ensuring optimal engine performance and longevity.