This workshop service repair manual covers Volvo vehicles equipped with the B17, B19, B21, and B23 inline-4 cylinder engines. These engines, available in displacements ranging from 1700cc to 2300cc, feature SOHC valvetrain and were offered with either carbureted or fuel injection fuel systems, and paired with manual or automatic transmissions depending on the specific vehicle application. The engines are known for their robust engineering and reliability, forming the backbone of many Volvo models across various production years. This manual provides in-depth information for maintaining and repairing these versatile powerplants. The purpose of this comprehensive English-language manual is to serve as an authoritative guide for owners, mechanics, and technicians. It details essential maintenance procedures, including tune-up guidelines, recommended fluid types and capacities, and specific component adjustments. Diagnostic and troubleshooting sections are included to help identify and resolve issues efficiently. Furthermore, the manual provides detailed technical specifications for engine components, electrical systems, cooling, fuel, lubrication, and exhaust systems, along with information on emissions control for relevant models. This resource ensures that vehicles utilizing these Volvo engines can be kept in optimal working condition.