Nissan UD engine

The Nissan UD series of automobile engines were produced in a range of configurations from 3 cylinder to 12 cylinder. The engines were mainly used in heavy applications i.e. buses and trucks produced from 1971 through 1983.^[1]

Specification

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

UD-3 - 3076 cm3 - straight-3 diesel engine

Applications:

• Nissan Bus U690/UG680/UR690/NUR690
• Nissan Truck U680/DUG680/TU680/U681

UD-4 - 4941 cm3 - straight-4 diesel engine

Applications:

• Nissan Bus R80/RX102/4R82/4RA82/4RA104
• Nissan Truck T80/T80S/T80SD/TC81

UD-5 - 6177 cm3 - straight-5 diesel engine

Applications:

• Nissan Bus 5R104/5RA104
• Nissan Truck 5TWDC10

UD-6 - 7413 cm3 - straight-6 diesel engine

Applications:

• Nissan Bus 6R110/6RA110
• Nissan Truck 6TW1Z/6TW1ZS/6TW12SD

UD-V8 - 9882 cm3 - V8 diesel engine

Applications:

• Nissan Bus U8RA110

UD-12 - 14825 cm3 - V12 diesel engine

Applications:

• Nissan Dump Truck WD38

Nowadays the engines find its application in marine boats as an alternative to Cummins diesels.^[2]

References

1. ^ Kortai Piston Ring Set Catalog, http://www.kortai.com/pr_html/nissan.htm 
2. ^ Patrol4x4.com Forums Discussion, http://www.patrol4x4.com/forum/general-discussion-18/do-any-you-know-anything-about-ud-series-engines-10767/