3126B Engines Caterpillar


General Information

Usage:

120H 124



图 1g01139576

右视图(典型示例)

(1) 吊耳

(2) 发动机曲轴箱呼吸器

(3) 涡轮增压器

(4) 机油加注口r

(5) 水温调节器壳体

(6) 皮带张紧装置

(7) 放水螺塞

(8) 曲轴减振器

(9) 机油滤清器

(10) 水泵




图 2g01139579

左视图(典型示例)

(11) 机油加注口

(12) 吊耳

(13) 燃油滤清器

(14) 燃油起动注油泵(如有配备)

(15) 油位表(典型示例)

(16) 电子控制模块(ECM)

(17) 空气压缩机(如有配备)

(18) 缸盖接地螺柱

(19) 排油螺塞

3126B 发动机为直列六缸布局。 发动机的点火顺序为 1-5-3-6-2-4。 当从发动机的飞轮端观看发动机时,发动机的转向为逆时针。 发动机采用涡轮增压器和空冷后冷器。 发动机的缸径为 110 mm (4.3 in),冲程为 127 mm (5.0 in)。 排量为 7.25 L (442 cu in)。

液压电子式单体喷油器(HEUI)燃油系统消除了泵和管路燃油系统内使用的许多机械部件。 HEUI 燃油系统也可加强对正时和燃油空气混合的控制。 通过精确控制单体喷油器正时获得正时提前。 发动机转速由调整喷油持续时间来控制。 通过特殊的脉冲轮为电子控制模块(ECM)提供气缸位置和发动机转速检测信息。

发动机具有内置诊断,以便确保所有部件正常工作。 如果系统部件出现故障,可以通过仪表板上的检查发动机指示灯提醒操作员这个状况。 Caterpillar 电子技师(ET)可用来读取故障部件或工况的数字编码。 间歇性故障会记录和储存在存储器内。

起动发动机

发动机 ECM 将自动提供起动发动机所需的正确燃油量。 盘车起动发动机时不要踩下油门。 如果发动机 20 秒内没有起动,应松开起动开关。 再次使用起动马达之前,让起动马达先冷却两分钟。


注意

过量使用乙醚会造成活塞和活塞环损坏。 只在寒冷天气起动时才使用乙醚。


寒冷天气起动

寒冷天气发动机的起动和运转性能取决于燃油类型、机油粘度和其它选装的起动辅助装置。

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