BMW MARINE D12 DIESEL WORKSHOP SERVICE REPAIR MANUAL PARTS MANUAL ALSO INCLUDED This manual describes the overhaul of the BMW D 12 marine engine when not installed. All removal, installation and overhaul jobs on a specific assembly (component) are always combined into one section and named after the assembly. Additionally, at the beginning of each section the jobs are listed which are required The D 12 marine engine is a single-cylinder, four-stroke Diesel engine with direct injection. It features a single-circuit cooling system. The coolant pump with Neoprene impeller is driven directly from the crankshaft. The A.C. generator is located in the flywheel and, like the electric starter, is standard epuipment. The injection pump is driven from the camshaft. The injection system bleeds itself automatically.