This manual covers the Volvo B23 engine, an inline-4, 2.3-liter engine known for its robust design and reliability. Applicable across various model years, this engine family has been a cornerstone of Volvo's engineering, offering a balance of performance and durability. Its typical power output ranges between 100-130 horsepower, and it is compatible with both manual and automatic transmissions. The B23 engine features a water-cooled system and a distributor-based ignition, with fuel delivery options including carburetors or fuel injection depending on the specific variant. This comprehensive Full Service Repair Manual in English provides essential information for maintaining and repairing the Volvo B23 engine. It details critical maintenance procedures, including oil capacity, spark plug gap specifications, and valve lash adjustments. Technical specifications such as bore stroke, compression ratio, and recommended oil types are included to ensure proper engine operation. Furthermore, the manual guides users through various repair scenarios, offering solutions for troubleshooting and ensuring the longevity and optimal performance of the engine.