The Yanmar 1GM(10L), 2GM(F)(L), and 3GM(D)(F)(L) series marine engines are engineered for reliable marine propulsion. These diesel engines, with varying displacements depending on the specific model, are built to meet the demanding requirements of marine applications. Yanmar is recognized for its commitment to quality and durability, ensuring these engines provide consistent performance for a wide range of vessels. Their robust design and efficient operation make them a trusted choice for boat owners and operators. This comprehensive manual serves as an essential resource for maintaining and repairing your Yanmar marine engine. It covers a broad spectrum of topics, including general information, fuel systems, lubrication and cooling systems, engine removal and installation, transmission, steering, and electrical systems. Detailed procedures for routine maintenance, advanced troubleshooting, and parts lookup are provided. This guide is designed to assist owners, technicians, and mechanics in ensuring the optimal performance and longevity of their Yanmar engines.