3306C Engines for Caterpillar Built Machines Caterpillar


Piston and Rings

Usage:

D6D 01Y
请参阅可再用零件指南, SEBF8049, "活塞"。 参阅可再用零件指南, SEBF8068, "气缸套"。 参阅 可再用零件指南, SEBF8051, "活塞销和固定环"。

注: 安装过程中,连杆侧的凸片槽侧的数字应朝向发动机的曲轴。




图 1g01106920

1U-6431 活塞环槽量规 用于测量主要形式的活塞内的活塞环槽。 关于量规组件的正确使用参阅包括在量规组件中的说明卡片。

活塞顶环和中间环

(1) 活塞顶环

安装活塞环时应将带有"UP-1"标记的一侧朝向活塞顶部。

(2) 中间环

安装中间环时让有"UP-2"标记的一侧朝向活塞顶部。

当活塞环装进一个孔径为 120.70 mm (4.752 inch)的气缸套中时,规定的活塞环端部之间的间隙为如下数值:

顶环 ... 0.622 ± 0.191 mm (0.0245 ± 0.0075 in)
中间环 ... 0.622 ± 0.191 mm (0.0245 ± 0.0075 in)

新活塞顶环的厚度 ... 3.150 - 0.020 mm (0.1240 - 0.0008 inch)

新中间环的厚度 ... 2.375 - 0.020 mm (0.0935 - 0.0008 inch)

气缸套孔径每增加0.03 mm (0.001 inch) ,活塞环的端部间隙就增加0.08 mm (0.003 inch)。

油环

(3) 油环

装配时,油环的弹簧末端应该与油环开口间隙成 180 度。 从环的间隙必须能看见弹簧的蓝色部分。

活塞新油环槽的宽度 ... 4.033 ± 0.013 mm (0.1588 ± 0.0005 inch)
新的油环厚度 ... 3.98 ± 0.01 mm (0.1567 ± 0.0004 in)
油环槽与新的油环的间隙 ... 0.053 ± 0.023 mm (0.0021 ± 0.0009 in)
油环槽与使用后的油环的最大允许间隙 ... 0.15 mm (0.006 inch)

当活塞环装进孔径为120.70 mm (4.752 inch)的缸套中时,活塞环端之间的规定间隙为如下数值:

油环 ... 0.57 ± 0.19 mm (0.022 ± 0.008 inch)

气缸套孔径为增加0.03 mm (0.001 inch) ,活塞环端部间隙就增加0.08 mm (0.003 inch)。

活塞销孔

(4) 活塞销孔(椭圆形销孔)

活塞销中的孔径

垂直方向直径 ... 43.188 ± 0.004 mm (1.7003 ± 0.0002 in)
水平方向直径(垂直方向直径加上下列数值) ... 0.040 ± 0.007 mm (0.0016 ± 0.0003 in)
活塞销与孔之间的间隙 ... 0.004 至 0.022 mm (0.00015 至 0.0009 inch)
使用后活塞销与孔之间的最大允许间隙 ... 0.05 mm (0.002 inch)
新活塞销直径 ... 43.175 ± 0.005 mm (1.6998 ± 0.005 in)

注: 当活塞安装到发动机中时,活塞顶部的 "V" 形标记必须与气缸体上的"V"形标记对齐。

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