This workshop manual covers the Volvo Penta MD6A and MD7A marine diesel engines. These engines are known for their robust construction and reliable performance in marine applications. Designed for a variety of vessels, they represent a commitment to engineering excellence and durability. The information within this manual is tailored to ensure these engines operate at their peak efficiency and longevity. The purpose of this English-language workshop manual is to provide comprehensive guidance for the maintenance, repair, and servicing of the Volvo Penta MD6A and MD7A marine diesel engines. It details essential information including safety precautions, general engine information, specific repair methods for each model, electrical system details, and the use of specialized tools. Technical data and recommended procedures are outlined to assist owners, technicians, and mechanics in effectively maintaining and troubleshooting these engines.