C175-16 and C175-20 Engines for Off-Highway Trucks Caterpillar


Camshaft

Usage:

793F SSP



图 1g01460189

注: 组装前,将 8T-2998 润滑剂 涂敷在止推垫圈的侧面。 将一薄层 8T-2998 润滑剂 涂敷在凸轮轴轴承与止推垫圈凹槽接触的区域。

(1) 止推垫圈的尺寸

新止推垫圈的厚度 ... 8.50 ± 0.05 mm (0.335 ± 0.002 in)
新凸轮轴槽的厚度 ... 8.75 ± 0.05 mm (0.344 ± 0.002 in)
新凸轮轴的端隙 ... 0.15 到 0.35 mm (0.006 到 0.014 in)

注: 将凸轮轴组装至缸体前,将一薄层 8T-2998 润滑剂 涂敷在每个凸轮轴轴颈和凸轮轴轴承的外径上。

(A) 轴颈表面尺寸

轴承轴颈直径 ... 91.88 ± 0.02 mm (3.617 ± 0.001 in)
组装后凸轮轴上的轴承孔径 ... 92.152 ± 0.015 mm (3.6280 ± 0.0006 in)



图 2g01460209

(2) 8 个拔梢锁紧双头螺柱的扭矩 ... 35 ± 5 N·m (26 ± 4 lb ft)

(B) 定位销自前凸轮轴端部的伸出量 ... 11.5 ± 0.5 mm (0.45 ± 0.02 in)




图 3g01420238

按照以下步骤得出实际凸轮升程:

  1. 测量凸轮轴凸轮高度 (D) 。

  1. 测量基圆 (E) 。

  1. 从凸轮高度值 (D) 中减去基圆 (E) 。 二者之差就是实际凸轮轴凸轮升程 (C) 。

(C) 凸轮轴凸轮规定升程

进气凸轮 ... 12.448 mm (0.4901 in)
排气凸轮 ... 17.184 mm (0.6765 in)

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