This service repair workshop manual covers the Yanmar 4JM-TE marine diesel engine, a turbocharged engine designed for marine propulsion. Engineered for reliability, this engine represents a significant advancement in marine power technology, offering robust performance and efficiency for demanding aquatic applications. Its advanced design and construction ensure dependable operation, making it a preferred choice for boat owners and operators seeking quality and durability. This manual provides comprehensive guidance for maintaining and repairing the Yanmar 4JM-TE. It includes detailed procedures for complete disassembly and reassembly, supported by hundreds of photos and illustrations. Coverage extends to routine maintenance, including periodic checklists, and in-depth system servicing for fuel injection and electrical components. Technical data, such as tightening torques and service standards, along with test running procedures and lists of required tools, are also provided, ensuring that owners, mechanics, and technicians have all the necessary information for optimal engine upkeep.