This manual covers the BUKH DV10LME and DV10LSME diesel engines. These naturally aspirated, two-cylinder engines are designed for marine applications, featuring compression ignition and raw water cooling. They typically produce 9.2 kW (12.5 HP) at 3000 RPM and are equipped with a 12V starter motor. The engines are engineered for reliability and efficient operation in demanding marine environments, with a focus on robust performance. The purpose of this English-language manual is to provide comprehensive guidance for the operation, maintenance, and servicing of the BUKH DV10LME and DV10LSME engines. It details essential procedures, including lubrication requirements, and offers insights into the engine's technical specifications. This resource is intended to assist owners, operators, and technicians in ensuring the longevity and optimal performance of their BUKH engines through proper care and troubleshooting.