The Yanmar 4LHE is a robust internal combustion engine designed for marine propulsion. This diesel engine features a displacement of 2.366 L, a bore of 88 mm, and a stroke of 97 mm, operating at 2800 RPM. Its design incorporates a naturally aspirated air intake, direct injection fuel system, and a wet exhaust, all contributing to its reliable performance. The engine utilizes a forced lubrication system and is raw water cooled, ensuring efficient operation in demanding marine environments. With its four cylinders and compression ignition, the 4LHE is engineered for durability and consistent power output. This Service Repair Manual provides comprehensive guidance for the Yanmar 4LHE engine. It covers essential maintenance procedures, including oil capacity of 9.5 L and the recommended API CF or higher oil type, along with a service interval of 250 hours or annually. Technical specifications detail the engine's electrical system (12V), fuel type, and cooling method. This manual serves as an indispensable resource for owners, mechanics, and technicians, offering the necessary information to maintain, troubleshoot, and ensure the optimal performance and longevity of the Yanmar 4LHE marine propulsion engine.