This manual covers the Volvo Penta D3 Marine Diesel Engine, a 5-cylinder, 2.4-liter engine known for its robust design and efficient performance. The D3 series offers a power range from 81 kW to 140 kW (110 HP to 190 HP) and features a Common Rail Direct Injection fuel system, indirect cooling, and a wet sump lubrication system. Designed for reliability and durability in marine environments, these engines are engineered to provide consistent power and fuel efficiency. This comprehensive Workshop Service Repair Manual provides essential information for maintaining and repairing the Volvo Penta D3 Marine Diesel Engine. It includes detailed repair instructions with illustrations, fault tracing procedures, and full overhaul guidance for disassembly and assembly. The manual also covers technical data, safety information, and specific details on the engine block, cylinder head, lubrication system, fuel system, and cooling system, ensuring that owners, mechanics, and technicians have the resources needed for proper service.