Isuzu 4BD1 Series Engine

The Isuzu 4BD1 is a 3.9 litre four cylinder diesel engine. It was manufactured by Isuzu in Japan and in some places is still in production. In the USA, early forms of this engine were known as the QD100. The six cylinder version (6BD1) was also known as the QD150. Approx 1980 this engine became available as an industrial and marine engine, it also used in Isuzu light trucks known as the K series. As a marine and industrial engine the 4BD1 and 4BD1T continue to be sold in some countries. Isuzu still offer 4BG1 and 4BG1T industrial and marine engines which while larger displacement are the same engine family and offer power outputs of up to 200hp.