3114, 3116, and 3126 Engines Caterpillar


Fuel System Pressure - Test

Usage:

IT38G 1CW

表 1
所需工具    
零件号     零件名称     数量    
1U-5470     发动机压力表总成     1    
3Y-2888     接头     1    
3J-1907     O 形密封圈     1    

注: 5P-2720 探测器适配器 ((自密封))和 164-2192 探测器适配器总成 可与所需工具配合使用。 使用这些工具可在将来安装压力探测器。




图 1g00294866

1U-5470 发动机压力总成

1U-5470 发动机压力表组 可用来检查发动机的燃油压力。 发动机压力表总成内含专门说明书, SEHS8907, " 1U-5470 发动机压力表总成 的使用"。 此说明提供了有关如何使用该总成的的信息。

燃油压力读数




图 2g00701422

回油管

(1) 缸盖

(2) 压力调节孔

(3) 管组件(燃油回流)

(4) 单向阀组件

(5) 压力安全阀

(6) 燃油出口

(7) 燃油通道

输送至缸盖 (1) 内部燃油通道 (7) 的典型的燃油压力可能出现变化。 在额定转速和负载条件下,输送至燃油通道的燃油压力为 200 至 400 kPa (29 至 58 psi)。 在低怠速下,管组件 (3) 内的压力调节孔 (2) 保持输送至喷油器的最低燃油压力 50 kPa (7.3 psi)。 单向阀 (4) 防止燃油离开缸盖燃油通道。

检查燃油压力




图 3g00701423

(8) 燃油滤清器底座

(9) 燃油测压口(未过滤侧)

(10) 燃油测压口(过滤侧)

要检查未经过滤的燃油压力,从燃油滤清器底座 (8) 上的燃油测压口 (9) 拆下螺塞。 将下述工具安装至燃油测压口: 3J-1907 O 形密封圈, 3Y-2888 接头 和 1U-5470 发动机压力总成 。 安装工具后,运行发动机以获得燃油压力读数。

要检查燃油通道的燃油压力,从燃油测压口 (10) 拆下螺塞。 将下述工具安装至燃油测压口: 3J-1907 O 形密封圈, 3Y-2888 接头 和 1U-5470 发动机压力总成 。 安装工具后,运行发动机以获得燃油压力读数。

注: 检查燃油压力前,确保燃油滤清器清洁。 燃油滤清器阻塞将导致测压口 (10) 的燃油压力低于测压口 (9) 的燃油压力。

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