C4.4 Engines for Caterpillar Built Machines Caterpillar


Pistons and Connecting Rods - Remove

Usage:

C4.4 2W2

拆卸步骤

表 1
所需工具 
工具  零件号  零件描述  数量 
A(1)   9U-6198  曲轴转动工具 
A(2)   9U-7336  盘车装置壳体 
5P-7305 齿轮 
8S-2269  缸口铰刀 
227-4390  E12 梅花套筒 
(1) 曲轴转动工具用于前皮带轮。
(2) 该工具在电动起动马达的孔上使用。

开始:

  1. 拆下缸盖。 请参阅拆解和组装, "缸盖 - 拆卸"。

  2. 如果发动机配备平衡器,则卸下该平衡器。 请参阅拆解和组装, "平衡器 - 拆卸"。 如果发动机未配备平衡器,则卸下发动机机油泵。 请参阅拆解和组装, "发动机油泵 - 拆卸和安装"。

  3. 拆下活塞冷却喷嘴。 请参阅拆解和组装, "活塞冷却喷嘴 - 拆卸和安装"。

注: 可以使用两个工具 (A) 中的任意一个。 请使用最适用的工具。


注意

保持所有零件清洁无杂质。

杂质会造成快速磨损和缩短部件寿命。


  1. 使用工具 (A),转动曲轴,使曲柄销处于下止点位置。

  2. 使用工具 (B) 除去缸孔顶部内表面上的积碳。


    图 1g01479383

  3. 连杆和连杆盖侧面应有浸蚀编号 (X)。 连杆和连杆盖上的编号必须相互匹配。 确保标记连杆和连杆盖 (2) 的正确位置。 如有必要,在连杆和连杆盖上做出一个临时的标记来识别缸号。

    注: 请勿压印连杆组件。 在连杆组件上压印或冲孔会导致连杆断裂。

  4. 使用工具 (C) 拆下螺栓 (1),然后从连杆上拆下连杆盖 (2)。


    图 2g01479386
    典型示例

  5. 小心地把活塞 (3) 和连杆组件推出缸孔。 将活塞抬出缸体顶部。

    注: 不要推压连杆的断面分裂面,否则会导致损坏。

  6. 在从发动机上取出组件后,暂时将连杆盖 (2) 和螺栓 (1) 安装到连杆上。 拧紧螺栓 (1) 至扭矩为 15 N·m (132.76 lb in)

    注: 放置断面分裂式连杆时必须要安装连杆盖。 确保连杆盖与连杆上的蚀刻编号相互匹配。 确保连杆盖的朝向正确。

  7. 对其余的活塞和连杆,重复步骤 1 至步骤 5。

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