This workshop service repair manual covers the Volvo B23 engine series, an inline-4 cylinder engine with a displacement of 2.3 liters. Known for its robust design and reliability, the B23 engine has been utilized across various applications, with horsepower typically ranging from approximately 100 to 140 hp, depending on the specific configuration. Its fuel system can be either carburetor or fuel injection based, and it features a liquid-cooled system. This engine series is a testament to Volvo's commitment to durable and efficient automotive engineering. This comprehensive English-language manual provides essential information for maintaining and repairing the Volvo B23 engine. It details critical maintenance procedures, including oil capacity and recommended types, oil filter specifications, spark plug gap settings, and information on timing belt tension and valve clearance adjustments. Technical specifications and troubleshooting guidance are also included, empowering owners, mechanics, and technicians to ensure the optimal performance and longevity of the B23 engine.