This full service and repair manual provides comprehensive guidance for the YANMAR 4LHA Series marine diesel engines. Engineered for reliability and performance, these 4-cylinder diesel engines are designed for demanding marine applications. While specific model years are not detailed, this manual covers the series, offering in-depth information essential for maintaining these robust power units. This manual is your definitive resource for understanding, maintaining, and repairing your YANMAR 4LHA Series engine. It includes detailed step-by-step instructions, high-quality diagrams, and exploded views to facilitate complete disassembly and reassembly. Coverage encompasses all manufacturer specifications, lubrication details, troubleshooting procedures, and recommended service intervals, making it invaluable for both do-it-yourself owners and professional mechanics.