Liebherr D924 Complete Diesel Engine Assembly The Liebherr D924 complete diesel engine assembly is a 4-cylinder, 6.7 litre water-cooled unit specifically designed for R924 and R924B hydraulic excavators. Available in new, remanufactured, and used-original grades to meet various operational needs and budgets. Key Features Liebherr D924 complete diesel engine assembly, model D924 TI-E 4-cylinder in-line, water-cooled, 6.7 litre displacement Bore 122 mm x stroke 142 mm