The SD23 is a 2.3L (2289 cc) Straight 4 diesel engine with 8 valves (2 per cylinder), and a distributor type injection pump.
In 1981, pistons were upgraded to a three ring piston with a steel compression ring carrier cast as part of the piston for improved durability. The engine has three main bearings (an SD33 six minus two rear cylinders) and was never available with turbocharging like its six-cylinder derivative. The SD22 was used in the Datsun 720 pickup trucks 1980 through 1983, producing 61 SAE brake horsepower 4000 rpm. It was used in the 1965-1971 Nissan Cedric It was also produced in a marine version MN 22 by Chrysler Marine under license during the 1980s. The SD22 is a normally aspirated 2.2L (2164 cc) Straight 4 diesel engine. The Diesel version Nissan Cedric in mid 1960s was using this engine. The SD20 is a normally aspirated 2.0L Straight 4 diesel engine.
The Engine was also used in the UD 3400 series light truck, large forklifts, Marine applications, in International Scout offerings from 1976 to 1979,as well as Jeep CJ-10 and Cj-10a flightline tow vehicles from 1985 to 1986.
