This workshop service repair manual covers MAN marine diesel engines, specifically the D2866 LE401, LE402, LE403, LE405 series and the D2876 LE301, LE403 series. These engines are engineered for demanding marine applications, offering robust performance and reliability. The D2866 series features an inline 6-cylinder configuration with a displacement of 12.4 liters, while the D2876 series also utilizes an inline 6-cylinder configuration with a displacement of 13.4 liters. Though specific production years are not detailed, these engines represent advanced diesel technology designed for sustained operation in marine environments. The purpose of this comprehensive manual is to provide detailed guidance for the maintenance, repair, and troubleshooting of these MAN marine diesel engines. It includes essential information such as service schedules, lubrication details, fuel system diagrams, and specifications for critical components like the cylinder head, crankshaft, and intake/exhaust systems. Furthermore, the manual contains information on special tools, troubleshooting tables, overhaul procedures, and commissioning after overhaul. This resource is invaluable for owners, mechanics, and technicians seeking to ensure optimal performance and longevity of their MAN marine diesel engines.