This workshop repair manual covers YANMAR 2T and 3T marine diesel engines, designed for robust performance in marine applications. These engines are recognized for their professional quality and reliability, ensuring dependable operation for a wide range of marine tasks. This manual provides comprehensive information for all models, facilitating optimal engine performance and longevity. The purpose of this manual is to provide in-depth, step-by-step instructions for all servicing, repairs, and routine maintenance procedures. It includes detailed information, pictures, and wiring diagrams presented in an easy-to-follow layout, ensuring that owners, mechanics, and technicians can effectively maintain and repair their YANMAR engines. This resource is designed to empower users with the knowledge needed for efficient upkeep, leading to significant cost savings on repairs.