This workshop service repair manual covers the Volvo Penta MD21A and MD32A marine diesel engines. These inline diesel engines are engineered for reliable performance in marine applications, with the MD21A featuring a 2.1-liter displacement and the MD32A a 3.2-liter displacement. Both models utilize either raw water cooling or a heat exchanger system, depending on the specific installation. The manual provides comprehensive information to ensure optimal operation and longevity of these robust marine powerplants. The purpose of this English-language manual is to provide detailed guidance for the maintenance, repair, and troubleshooting of the Volvo Penta MD21A and MD32A engines. It includes numbered, step-by-step instructions, accompanied by detailed illustrations, exploded diagrams, drawings, and photos to facilitate understanding. The manual covers essential areas such as fuel system and cooling system maintenance, along with troubleshooting guidance. Safety information, including notes, cautions, and warnings, is integrated throughout to promote safe working practices.