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Nissan UD engine 
Summary
The Nissan UD series of diesel engines 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 buses and trucks produced from 1990 through 1998.[1]
Specification edit
All engines retain the same bore and stroke ratio - 110 mm x 130 mm.
UD-3 - 3706 cc - straight-3 diesel engine edit
Applications:
- Nissan Bus U690/UG680/UR690/NUR690
- Nissan Truck U680/DUG680/TU680/U681
UD-4 - 4941 cc - straight-4 diesel engine edit
Applications:
- Nissan Bus R80/RX102/4R82/4RA82/4RA104
- Nissan Truck T80/T80S/T80SD/TC8
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UD-5 - 6177 cc - straight-5 diesel engine edit
Applications:
- Nissan Bus 5R104/5RA104
- Nissan Truck 5TWDC10
UD-6 - 7413 cc - straight-6 diesel engine edit
Applications:
- Nissan Bus 6R110/6RA110
- Nissan Truck 6TW1Z/6TW1ZS/6TW12SD
UD-V8 - 9883 cc - V8 diesel engine edit
Applications:
- Nissan Bus U8RA110
UD-V12 - 14825 cc - V12 diesel engine edit
Applications:
- Nissan Dump Truck WD38
Marine applications edit
Nowadays, these engines find applications in boats as an alternative to Cummins diesels.[2]