This workshop service repair manual covers the Volvo Penta TAD Series marine diesel engines, specifically the TAD1340VE through TAD1355GE models. These 12.78L, 6-cylinder in-line, 4-stroke, turbocharged diesel engines are engineered for demanding marine applications, offering robust performance and reliability. The comprehensive nature of this manual reflects the advanced engineering and quality inherent in the Volvo Penta TAD Series, ensuring optimal operation and longevity for these powerful marine powerplants. This manual provides detailed, step-by-step procedures for the maintenance, servicing, and repair of your Volvo Penta TAD Series diesel engine. It includes essential sections on general information, engine specifications, safety instructions, special tools, and in-depth coverage of all major engine systems, including the cylinder head, pistons, lubricating and oil system, fuel system, inlet and exhaust system, turbocharger, and cooling system. Technicians and owners alike will find this manual an indispensable resource for understanding, maintaining, and troubleshooting these engines, ensuring they perform at their peak.