This manual covers the JCB DIESELMAX Tier 3 SE Engine, a robust diesel engine designed for demanding applications. Featuring a 4-cylinder, turbocharged configuration with a 4.4-liter displacement, this liquid-cooled engine meets Tier 3 emission standards. Its common rail injection system and compression ignition ensure efficient power delivery. The engine's engineering prioritizes reliability and performance, making it a dependable choice for various industrial and heavy-duty uses. This Service Repair Manual provides comprehensive guidance for the repair, servicing, and technical maintenance of the JCB DIESELMAX Tier 3 SE Engine. It includes detailed procedures, technical specifications, and safety guidelines, supported by diagrams, photo illustrations, and schemes. This manual is an essential resource for owners, mechanics, and technicians to ensure the optimal performance and longevity of the engine through proper maintenance and repair practices.