This manual pertains to CAV and Bosch PE-A/PE-B fuel injection pumps, integral components of diesel engine fuel systems. These pumps utilize a mechanical injection system with a plunger and barrel delivery mechanism, featuring mechanical timing control. Engineered for reliability and performance, these fuel injection pumps are designed to ensure precise fuel delivery for optimal engine operation. The manual covers various models and eras, providing essential information for maintaining these critical diesel engine components. The purpose of this English-language service and testing instruction manual is to provide comprehensive guidance for the maintenance, testing, and troubleshooting of CAV-Bosch PE-A and PE-B fuel injection pumps. It details procedures for assessing fuel injection pump performance and calibration, including necessary diagnostic tools like a fuel injection test bench and key testing parameters such as delivery pressure, flow rate, and timing. Common issues like low power, rough running, and fuel leaks are addressed, making this manual an indispensable resource for diesel engine mechanics and service technicians.