The Nissan UD series of

diesel engine The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-ca ...

s were produced by Nissan in a range of configurations from three to twelve cylinders, all sharing the same internal dimensions. The engines were mainly used in heavy applications, such as

bus A bus (contracted from omnibus, with variants multibus, motorbus, autobus, etc.) is a road vehicle that carries significantly more passengers than an average car or van. It is most commonly used in public transport, but is also in use for cha ...

es and

truck A truck or lorry is a motor vehicle designed to transport cargo, carry specialized payloads, or perform other utilitarian work. Trucks vary greatly in size, power, and configuration, but the vast majority feature body-on-frame constructi ...

s produced from 1990 through 1998.

Specification

All engines retain the same bore and stroke ratio - 110 mm x 130 mm.

UD-3 - 3706 cc - straight-3 diesel engine

Applications: * Nissan Bus U690/UG680/UR690/NUR690 * Nissan Truck U680/DUG680/TU680/U681

UD-4 - 4941 cc - straight-4 diesel engine

Applications: * Nissan Bus R80/RX102/4R82/4RA82/4RA104 * Nissan Truck T80/T80S/T80SD/TC8 my shipping container

UD-5 - 6177 cc - straight-5 diesel engine

Applications: * Nissan Bus 5R104/5RA104 * Nissan Truck 5TWDC10

UD-6 - 7413 cc - straight-6 diesel engine

Applications: * Nissan Bus 6R110/6RA110 * Nissan Truck 6TW1Z/6TW1ZS/6TW12SD

UD-V8 - 9883 cc - V8 diesel engine

Applications: * Nissan Bus U8RA110

UD-V12 - 14825 cc - V12 diesel engine

Applications: * Nissan Dump Truck WD38

Marine applications

Nowadays, these engines find applications in

boat A boat is a watercraft of a large range of types and sizes, but generally smaller than a ship, which is distinguished by its larger size, shape, cargo or passenger capacity, or its ability to carry boats. Small boats are typically found on inl ...

s as an alternative to

Cummins Cummins Inc. is an American multinational corporation that designs, manufactures, and distributes engines, filtration, and power generation products. Cummins also services engines and related equipment, including fuel systems, controls, air ...

diesels.

References

{{nissan UD Diesel engines by model Straight-three engines Straight-four engines Straight-five engines Straight-six engines V8 engines V12 engines