This workshop service manual covers Volvo vehicles equipped with the B17/B19/B21/B23 engine family, produced during the early to mid-1980s. These inline-4, water-cooled engines, with displacements ranging from 1700cc to 2316cc, were available with either carbureted or fuel injection systems and featured overhead valve or overhead cam valvetrains. Power output typically ranged from 70 to 130 horsepower, depending on the specific engine variant and tuning. The vehicles supported both manual and automatic transmissions. This comprehensive manual provides detailed information for professional repair and maintenance. It covers essential procedures such as oil changes with recommended viscosity and intervals, filter replacements, and timing belt or chain service. Diagnostic and troubleshooting guidance is included for common issues related to the ignition, cooling, and fuel systems, as well as electrical components like the 12V battery and alternator. Technical specifications and safety guidelines are also detailed to ensure proper upkeep and repair of your Volvo.