This workshop service manual covers the Volvo B23 engine, a 2.3-liter inline-4 internal combustion engine known for its robust design and reliable performance. With a bore of 96.0 mm and a stroke of 79.5 mm, this liquid-cooled engine utilizes a distributor with coil ignition and can be equipped with either carburetor or fuel injection systems depending on the specific application. Its versatility makes it suitable for a range of automotive uses where dependable power and efficiency are paramount. This comprehensive English-language manual is designed for professional technicians and provides detailed information essential for the maintenance, diagnosis, and repair of the Volvo B23 engine. It includes critical technical specifications, such as compression ratios ranging from 8.8:1 to 9.3:1, and precise maintenance procedures covering lubrication, filter replacement, tune-up specifications like spark plug gap, and valve clearance adjustments for both intake and exhaust. Understanding and applying the information within this manual will ensure optimal engine operation and longevity.