G3304 and G3306 Engines Caterpillar


Cylinder Head Valves

Usage:

G3304 37Y



图 1g01652139



图 2g01923535

注: 组装之前,用清洁的发动机机油涂覆气门杆。

(1) 7S-7144 弹簧

在试验力下的长度 ... 44.86 mm (1.766 in)
试验力 ... 257 ± 25 N (58 ± 5.6 lb)
测试后的自由长度 ... 52.07 mm (2.050 in)
外径 ... 35.21 mm (1.386 in)

(A) 至气门导管顶部的高度 ... 45.62 ± 0.25 mm (1.796 ± 0.010 in)

(B) 气门唇

可再次使用的气门唇厚度为下列数值:
排气门 ... 2.64 mm (0.104 in)
进气门 ... 2.69 mm (0.106 in)

(C) 气门杆的尺寸

气门杆的直径 ... 9.441 ± 0.008 mm (0.3717 ± 0.0003 in)
可再次使用的最小直径 ... 9.408 mm (0.3704 in)
安装后新气门导管的最小孔径 ... 9.484 ± 0.025 mm (0.3734 ± 0.0010 in)
最小允许气门导管孔径 ... 9.581 mm (0.3772 in)

(D) 气门盖直径

排气门 ... 48.16 ± 0.13 mm (1.896 ± 0.005 in)
进气门 ... 51.31 ± 0.13 mm (2.020 ± 0.005 in)

(E) 气门表面角度 ... 29.25 度

(F) 量规面

(G) 缸盖上的气门座圈孔深度

排气门 ... 11.40 ± 0.13 mm (0.449 ± 0.005 in)
进气门 ... 8.87 ± 0.13 mm (0.349 ± 0.005 in)

(H) 气门座圈表面角度 ... 30 ± 1 度

(J) 研磨座圈表面,以将最大座圈直径降低到以下角度。 ... 30.25 ± 0.5 度

(K) 从关闭的气门顶部到盖表面的尺寸

排气门的最大允许尺寸 ... 2.98 mm (0.117 in)
排气门的最小允许尺寸 ... 2.42 mm (0.095 in)
进气门的最大允许尺寸 ... 3.51 mm (0.138 in)
进气门的最小允许尺寸 ... 2.92 mm (0.115 in)

(L) 从量规面到盖表面的量规直径和距离

排气门座圈量规直径 ... 45.11 mm (1.776 in)
从进气座圈量规直径到盖表面的距离 ... 0.58 ± 0.08 mm (0.023 ± 0.003 in)
进气门座圈量规直径 ... 48.26 mm (1.900 in)
从排气座圈量规直径到盖表面的距离 ... 0.86 ± 0.08 mm (0.034 ± 0.003 in)

(M) 气门座圈尺寸

排气门座圈直径 ... 50.889 ± 0.013 mm (2.0035 ± 0.0005 in)
缸盖上的排气门座圈孔径 ... 50.813 ± 0.030 mm (2.0005 ± 0.0012 in)
进气门座圈直径 ... 52.032 ± 0.013 mm (2.0485 ± 0.0005 in)
缸盖上的进气门座圈孔径 ... 51.956 ± 0.030 mm (2.0455 ± 0.0012 in)

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