This Service Repair Workshop Manual provides comprehensive information for the Volvo D20/D24, first generation, produced between 1979 and 1988. These vehicles are equipped with robust diesel engines, including the 2.0-liter inline-4 D20, producing approximately 60-65 horsepower with indirect injection, and the 2.4-liter inline-6 D24, offering around 82-85 horsepower, also featuring indirect injection. Transmission options include manual gearboxes typically with 4 or 5 speeds, and automatic transmissions usually with 3 speeds. Known for their engineering quality and reliability, these Volvo models were designed for dependable performance. This manual is designed to assist owners, mechanics, and technicians in maintaining and repairing the Volvo D20/D24. It covers essential areas such as detailed maintenance procedures, including recommended diesel engine oil types and capacities, coolant specifications, and timing belt replacement intervals. Diagnostic and troubleshooting guidance is provided to address potential issues, alongside technical specifications for key components and systems. Safety guidelines are also included to ensure proper and secure operation and repair practices.