This service and repair manual covers the Mitsubishi K3M and K4M engines, applicable to all production years. These internal combustion engines are known for their robust design and reliable performance, featuring 4-cylinder inline configurations. The K3M variant offers a displacement of approximately 1.3 liters (1298 cc) with a SOHC valve train, while the K4M variant provides a larger 1.6-liter (1598 cc) displacement and a DOHC valve train with Electronic Fuel Injection. Both engine families are liquid-cooled, designed for dependable operation across various applications. This comprehensive English-language manual provides all necessary service and repair procedures for the Mitsubishi K3M/K4M engines. It details essential maintenance tasks, troubleshooting guides, and technical specifications, including information on lubrication, timing belt replacement, and recommended service intervals. The manual is an indispensable resource for owners, mechanics, and technicians, ensuring proper upkeep and efficient repair of these engines to maintain their optimal performance and longevity.