3304B and 3306B Engines for Caterpillar Built Machines Caterpillar


Camshaft - Remove and Install

Usage:

D6D 01Y

拆卸步骤

开始:

  1. 拆下气门挺杆。 请参考解体与组装, "挺杆总成 - 拆卸和安装"。
  2. 拆下正时齿轮盖。 请参考解体与组装, "前壳体 - 拆卸"。


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。





    图 1g00476744

  1. 转动曲轴至 1 缸活塞压缩行程的上止点。 曲轴齿轮上的 "C" 标记与凸轮轴齿轮上的 "C" 标记对准。



    图 2g00476743

    注: 在位置 (A) 上的燃油喷油泵驱动齿轮和惰齿轮的轮齿上作一个标记。 这将有助于在凸轮轴拆卸和安装过程中保持发动机正时正确。 在位置 (B) 上的惰齿轮的轮齿和凸轮轴齿轮 (2) 的轮齿上作一个标记。 在安装凸轮轴时,当位置 (A) 的标记对准了位置 (B) 的标记,并且曲轴齿轮上的 "C" 标记对准了凸轮轴齿轮上的 "C" 标记,则发动机正时正确。

  1. 拆下螺栓、锁片和垫圈 (1) 。



    图 3g00535590


    注意

    拆卸凸轮轴时不要损坏凸轮或轴承。


  1. 从发动机上小心地拆下凸轮轴 (3) 。

  1. 如有必要,拆下将凸轮轴驱动齿轮 (2) 固定到凸轮轴上的螺栓,然后拆下齿轮。

安装步骤


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。





    图 4g00535590

  1. 将凸轮轴驱动齿轮 (2) 在凸轮轴端 (3) 上放置到位。 安装螺栓,将凸轮轴驱动齿轮 (2) 固定到凸轮轴 (3) 上。 将螺栓拧紧至扭矩 55 ± 7 N·m (41 ± 5 lb ft)。


    注意

    安装凸轮轴时不要损坏凸轮或轴承。


  1. 8T-2998 凸轮轴润滑剂 仅涂覆在凸轮轴凸轮上,将清洁的发动机机油涂覆在轴承轴颈上。

    注: 在安装凸轮轴 (3) 过程中,以两个方向旋转凸轮轴,来避免凸轮轴轴承孔粘合。

  1. 将凸轮轴 (3) 小心地安装到发动机上。



    图 5g00476743



    图 6g00476744

  1. 确保燃油喷油泵驱动齿轮和惰齿轮的轮齿上的标记与位置 (A) 对准。 确保惰齿轮和凸轮轴齿轮 (2) 上的标记与位置 (B) 对准。 将曲轴齿轮上与凸轮轴齿轮 (2) 上的 "C" 标记对准。 在全部正时标记都对准后,则发动机正时即是正确的。

  1. 安装垫圈 (1) 、锁片和两根螺栓,将凸轮轴在发动机上固定到位。

End By:

  1. 安装气门挺杆。 请参考 解体与组装, "挺杆总成 - 拆卸和安装"。
  2. 安装正时齿轮盖。 请参考 解体与组装, "前壳体 - 安装"。

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