3126B Engines Caterpillar


Finding Top Center Position for No. 1 Piston

Usage:

120H 124

表 1
所需工具    
工具     零件号     说明     数量    
A     136-4632     正时销     1    
B     139-7063     正时销接头     1    
C     5P-7305     发动机盘车工具     1    
D     9U-6943
或者
9U-7336    
壳体组件     1    
E     178-8615     发动机盘车工具     1    



图 1g01140081

正时孔位置(典型示例)




图 2g01140082

正时孔位置(典型示例)




图 3g01140087

正时孔位置(典型示例)

注: 正时销的销孔可能位于以下位置:

  • 飞轮壳的右前表面

  • 飞轮壳的左前表面

  1. 将螺塞 (1) 从飞轮壳 (2) 上拆下。 将工具 (A) 通过正时孔插入飞轮壳内。

    注: 必要时,利用工具 (B) 将正时销转接到较大的正时孔内。

  1. 将销组件缓慢拧入飞轮壳内。 通过松开工具把手上的锁,让销对准飞轮内的正时孔。

  1. 利用工具 (C) 、工具 (D) 和棘轮沿正常发动机转向转动发动机。 从飞轮端向前观看发动机时,发动机正常转向为逆时针方向。

    注: 可以利用工具 (E) 从发动机前端转动曲轴。

  1. 缓慢转动飞轮,直到工具 (A) 插入飞轮内的小孔中为止。

    如果飞轮转过了接合点,则采用以下程序重新调整飞轮后重试:

    1. 收回工具 (A) 的销并将工具锁定到收回位置。

    1. 沿与发动机正常转向相反的方向转动飞轮。 将发动机转过正时孔至少 30 度。

    1. 通过解锁工具 (A) 找到飞轮内的正时孔。 沿正常发动机转向转动飞轮,直到正时销插入飞轮内的正时孔为止。

  1. 采用以下程序确定 1 号活塞的冲程位置:

    1. 拆下气门机构盖。

    1. 检查 1 号活塞进气门和排气门的位置。

      如果满足以下条件,1 号活塞将处于压缩冲程:

      • 1 号活塞的进气门和排气门完全关闭。

      • 1 号活塞的摇臂可以用手移动。

      如果这些条件得到满足,则采用相同的条件检查 6 号活塞的冲程位置。 如果 6 号活塞处于压缩冲程,必须额外转动飞轮 360 度,以便使 1 号活塞位于压缩冲程。

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