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The Alco 251 is a 4-stroke diesel engine that was developed by the American Locomotive Company to replace its 244 and 539 engines. The 251 was developed to be used in diesel locomotives, as a marine power plant in ships, and as a stationary power generator.

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  • ALCO 251 (en)
  • ALCO 251 (pt)
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  • The Alco 251 is a 4-stroke diesel engine that was developed by the American Locomotive Company to replace its 244 and 539 engines. The 251 was developed to be used in diesel locomotives, as a marine power plant in ships, and as a stationary power generator. (en)
  • O motor diesel Alco 251 é um motor primário de combustão interna desenvolvido pela ALCO para substituir os antigos e . O desenvolvimento começou em 1949, e como o ALCO 244 deveria ter um diâmetro dos cilindros de 229mm(9")e um curso de 267 mm (10,5"). O engenheiro chefe de design diesel da ALCO, Paul Vaughan, projetou o 251 para resolver os principais pontos fracos que o 244 apresentou, como as grandes diferenças térmicas que o 244 apresentava, o novo 251 solucionou grande parte desses problemas com o uso de um aftercooler no turbo-alimentador, o que maximizou o desempenho do motor, no mesmo bloco do antigo 244. Outras modificações menores também foram feitas nos rolamentos, pistões, injetores e bombas. (pt)
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