3054E Industrial Engine Caterpillar


Piston and Rings

Usage:

3054E 304
注: 活塞冠部的箭头标记必须朝向发动机前部。

注: 必须保证所有活塞环开口间隙彼此之间间隔 120 度。




图 1g00888215

活塞和环的典型示例

(1) 顶部压缩环

自然吸气式
顶部压缩环的形状 ... 矩形,具有筒形表面
顶部压缩环的厚度 ... 2.475 至 2.49 mm (0.097 至 0.098 in)
顶部压缩环与活塞环槽之间的间隙 ... 0.09 至 0.15 mm (0.0035 至 0.0059 in)
环开口间隙 ... 0.30 至 0.55 mm (0.0118 至 0.0216 in)
涡轮增压式
顶部压缩环的形状 ... 梯形,具有筒形表面
顶部压缩环的厚度 ... 锥形
环开口间隙 ... 0.30 至 0.55 mm (0.0118 至 0.0216 in)

注: 安装新顶部压缩环时一定要确认字母 "TOP" 朝向活塞的顶部。 在竖直活塞上安装活塞顶环时,新活塞顶环带有的红色识别标记必须位于环开口端隙的左侧。

(2) 中间压缩环

中间压缩环的形状 ... 底部外边缘为内斜面,带锥形表面
中间压缩环的宽度 ... 2.47 至 2.49 mm (0.097 至 0.098 in)
中间压缩环与活塞环槽之间的间隙 ... 0.05 至 0.09 mm (0.002 至 0.003 in)
环开口间隙 ... 0.70 至 0.95 mm (0.0275 至 0.0374 in)

注: 安装新的中间压缩环时,顶部 "TOP" 字样必须朝向活塞的顶部。 在竖直活塞上安装中间环时,新中间环带有的绿色识别标记必须位于活塞开口间隙的左侧。

(3) 油控环

油控环的形状 ... 弹簧加载的双片线圈
机油控制环的宽度 ... 3.47 至 3.49 mm (0.1366 至 0.1374 in)
油控环与活塞环槽之间的间隙 ... 0.03 至 0.07 mm (0.0011 至 0.0027 in)
环开口间隙 ... 0.30 至 0.55 mm (0.0118 至 0.0216 in)

注: 用一个销将机油控制环弹簧两端固定到位。 机油控制环的弹簧端必须与油环开口间隙相对安装。

活塞

涡轮增压式发动机的燃烧杯凹角 ... 80 度

自然吸气式发动机的燃烧杯凹角 ... 70 度

活塞高于缸体的高度 ... 0.21 至 0.35 mm (0.008 至 0.014 in)

自然吸气式发动机活塞顶部环槽的宽度 ... 2.58 至 2.60 mm (0.1016 至 0.1024 in)

涡轮增压式发动机活塞顶部环槽的宽度 ... 锥形

活塞第二道槽的宽度 ... 2.54 至 2.56 mm (0.1000 至 0.1008 in)

活塞第三道槽的宽度 ... 3.52 至 3.54 mm (0.1386 至 0.1394 in)

活塞销

新活塞销直径 ... 39.694 至 39.700 mm (1.5628 至 1.5630 in)
活塞销孔的直径 ... 39.703 到 39.709 mm (1.5631 到 1.5633 in)

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