Volvo Penta (Volvo Penta) TAD551GE diesel engine is a common rail electronic injection, turbocharged and air-cooled inline 4-cylinder, 4.76-liter displacement, 4-stroke diesel generator engine. TAD551GE is a two-speed engine, with two speed modes of 50hz / 1500 rpm and 60hz / 1800 rpm, used for main and standby power generation.