This manual covers Volvo Penta MD21A, MD32A, AQD21A, and AQD32A marine diesel engines. Designed for service, repair, and maintenance, these engines are known for their robust construction and reliable performance in demanding marine environments. This comprehensive guide ensures you have the necessary information to keep your Volvo Penta engines operating at peak efficiency. The scope of this complete workshop service repair manual is extensive, providing easy-to-follow, step-by-step instructions with accompanying pictures for all repair and service procedures from A to Z. It is intended to assist owners, mechanics, and technicians in performing all necessary maintenance and repair tasks, ensuring the longevity and optimal function of the covered engine models.