This manual covers the Yanmar 6CXM-GTE and 6CXM-GTE2 marine diesel engines. These engines are engineered for demanding marine applications, featuring a robust 6-cylinder configuration, turbocharged and intercooled aspiration, and a displacement of approximately 6.5 liters. The 6CXM-GTE models are known for their reliable power output, with the GTE variant typically delivering 300-400 HP and the GTE2 variant offering 350-450 HP. Designed for durability and performance, these engines are suitable for a wide range of marine vessels requiring dependable propulsion. This comprehensive factory service and repair manual provides essential information for the maintenance and servicing of your Yanmar marine diesel engine. It includes detailed procedures for general operations, disassembly and reassembly of major engine components, inspection and servicing schedules, and critical specifications such as tightening torques. A dedicated troubleshooting section is also included to assist in diagnosing and resolving potential issues. This manual is an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance and longevity of the 6CXM-GTE and 6CXM-GTE2 engines.