This manual covers the Mitsubishi 4G1 Series engine, a versatile internal combustion engine known for its inline four-cylinder configuration and adaptable displacement, ranging from 1.2L to 1.6L depending on the specific variant. Engineered for reliability and efficiency, the 4G1 engine family utilizes fuel injection systems, with valve actuation managed by either SOHC or DOHC configurations employing timing belts or chains. While specific power and torque figures vary significantly based on the application, this engine series has been a foundational component in numerous vehicles, demonstrating consistent performance and durability. This comprehensive Service Repair Workshop Manual provides essential information for maintaining and repairing the Mitsubishi 4G1 Series engine. It details critical maintenance procedures, including lubrication requirements and service intervals, alongside in-depth troubleshooting guides and detailed component replacement instructions. The manual also includes engine rebuild procedures, offering a complete resource for technicians and owners alike to ensure the optimal performance, longevity, and correct functioning of their engine.