This Service Repair Workshop Manual covers Mitsubishi vehicles equipped with the 4D5 engine family, spanning multiple generations. The 4D5 engine is a liquid-cooled diesel engine available in various configurations, including naturally aspirated and turbocharged variants, with displacements typically ranging from 2.3L to 2.8L. Fuel systems vary by specific variant, encompassing indirect injection, direct injection, and common rail technologies. Transmission options include both manual and automatic, with specific gear counts depending on the application. This manual is designed to provide comprehensive information for maintaining and repairing these robust diesel engines. The purpose of this manual is to offer detailed guidance for owners, mechanics, and technicians. It covers a wide array of essential topics, including full service and repair instructions, diagnostic procedures, and troubleshooting for common issues such as engine starting problems, oil leaks, overheating, and performance concerns. Specific repair procedures are detailed for engine overhauls, cylinder head service, and fuel system components like injectors and pumps. Maintenance information, including details on glow plugs and timing drive systems (belt or chain), is also provided to ensure the longevity and optimal performance of your Mitsubishi vehicle.