This official service repair manual provides comprehensive information for the LIEBHERR D 9406, D 9408, D 9306, and D 9308 Diesel Engines. These engines are known for their robust engineering and reliable performance, making them suitable for demanding applications. This manual ensures that users have access to all necessary procedures for maintaining and repairing these powerful diesel units. The scope of this manual is extensive, covering detailed engine descriptions, technical data, adjustment values, and fluid quantities. It includes in-depth guidance on critical components such as the fuel system, lube oil circuit, and coolant circuit, along with procedures for valve adjustment, cylinder head, pistons, and crankshafts. Furthermore, the manual offers essential sections on maintenance, inspections, troubleshooting, and special tools, empowering owners, mechanics, and technicians to effectively service and preserve the operational integrity of their LIEBHERR diesel engines.