This workshop service manual covers the BMW D35 and D50 Marine Diesel engines. These engines are 4-stroke, water-cooled diesel units available in 2-cylinder (1416 cc) and 3-cylinder (2124 cc) configurations. Designed for marine applications, they emphasize robust engineering and reliable performance, ensuring consistent power delivery for demanding maritime operations. This comprehensive manual provides detailed information essential for the maintenance, servicing, and repair of your BMW D35/D50 Marine Diesel engine. It includes procedures for critical systems such as air and fuel filtration, cooling system service, lubrication, and electrical components including the generator and starter motor. Wiring diagrams are also included to assist with troubleshooting and diagnostics.