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In the late 1930s the US Army began setting requirements for custom built tactical trucks, winning designs would be built in quantity. As demand increased during WWII some standardized designs were built by other manufactures. Early in the war most manufacturers built their own engines and cabs, but during the war heavier trucks began using vendor engines and most vehicles used military style open cabs. Since WWII most tactical vehicles have used vendor engines and open cabs. Most trucks had gasoline (G) engines until the early 1960s, when multifuel (M) and diesel (D) engines were introduced. Since then diesel fuel has increasingly been used, the last gasoline engine vehicles were built in 1985. Most engines have been water-cooled with inline (I) cylinders, but V types (V) and opposed (O) engines have also been used. Three air-cooled engines were used in two very light trucks. Gasoline engines up to WWII were often valve in block design (L-head), during the war more overhead valve (ohv) engines were used, and after the war all new engines (except 1 F-head) have been ohv. All diesel engines have ohv, they can be naturally aspired, supercharged (SC), or turbocharged (TC). The same engines have been used in different trucks, and larger trucks have had different engines during their service life. Because of application and evolution, the same engine often has different power ratings. Common ratings are used in tables. Engines in the tables are water-cooled and naturally aspirated unless noted. 〔(【引用サイトリンク】title=TM 9 series Technical Manuals )〕 == American Motors == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「US Army tactical truck engines」の詳細全文を読む スポンサード リンク
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