Junkers Jumo 204

Jumo 204
Cut away view of a Jumo 205, a decreased capacity version of the Jumo 204
Type Aircraft Diesel engine
Manufacturer Junkers
First run 1929
Developed into Junkers Jumo 205

The Jumo 204 was an opposed-piston, inline, liquid-cooled 6-cylinder aircraft Diesel engine produced by the German manufacturer Junkers. It entered service in 1932. Later engines in the series, the Jumo 205, Jumo 206, Jumo 207 and Jumo 208, differed in stroke, bore, and supercharging arrangements.