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使用说明书中规定,S195型柴油机的供油提前角应在上止点前15°～18°。这个规定可理解为调整柴油机供油时间时,只要把供油提前角调到上止点前15°～18°之间的任一角度即可。这样理解对技术状态良好的新机无疑是正确的,但对用过一段时间的柴油机则是错误的。这是因为,用过一段时间的柴油机普遍是气缸活塞组磨损严重,压缩终了的气缸压力偏低(多在允许值附近)。由于气缸压力偏低,增加柴油机的着火延迟期时间,恶化了燃烧过程,使得压力升高速率、最高燃烧压力及压缩负功增加,从而造成燃烧过程粗暴、功率下降、
Operating instructions, S195 diesel fuel supply advance angle should be in the top dead center 15 ° ~ 18 °. This provision can be understood as the adjustment of diesel fuel supply time, as long as the fuel supply advanced to the top dead center point in any angle between 15 ° ~ 18 ° can be. It is undoubtedly correct to understand that a new aircraft of good technical status is correct, but it is wrong to use a diesel engine that has been used for some time. This is because, after a period of time the diesel engine is generally a serious wear and tear of the cylinder piston group, the end of the compression cylinder pressure is too low (more than the allowable value). As the cylinder pressure is low, increasing the ignition delay time of diesel engine, worsening the combustion process, making the pressure rise rate, the maximum combustion pressure and negative compression power increase, resulting in rough combustion process, power decline,