Fuel System Pressure - Test
燃油压力过低会导致功率低。 燃油压力过低也会使燃油产生能损坏喷油器的气穴现象。 下述情况可能导致燃油压力过低:
- 燃油滤清器阻塞
- 燃油注油泵的单向阀内有碎屑
- 压力调节阀内有碎屑
- 单向阀部分开启
- 燃油输油泵的燃油压力调节阀卡住或磨损
- 燃油滤清器底座的回燃油压力力调节阀严重磨损
- 输油泵齿轮磨损
- 燃油管路尺寸过小或受挤压变窄
- 旧燃油管路因管壁膨胀引起的内径缩小
- 燃油管路内壁表面损蚀
- 燃油管路接头受挤压变窄或尺寸过小
- 燃油箱,燃油管路或燃油系统部件内的碎屑对燃油流动产生阻力
燃油压力过高会造成燃油滤清器密封垫破裂 下述情况可能导致燃油压力过低:
- 燃油压力调节阀的节流孔堵塞
- 输油泵燃油压力调节阀卡住
- 回油管路受挤压变窄
发动机在工作温度时的典型燃油压力可能会发生变化。 低怠速时,燃油压力可达
当燃油压力降至低于
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所需工具 | ||
零件号 | 零件名称 | 数量 |
1U-5470 或 198-4240 |
发动机压力表组 或 数字式压力指示仪 |
1 |
3Y-2888 | 接头 | 1 |
3J-1907 | O 形密封圈 | 1 |
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图 1 | g00294866 |
1U-5470 发动机压力表总成 |
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图 2 | g01098018 |
(1) 典型的燃油压力测压点位置 |
要检查输油泵油压,从燃油滤清器上拆下螺塞。 安装带有 3J-1907 O 形密封圈的 3Y-2888 接头。 安装压力表,起动发动机。
1U-5470 发动机压力表组可用来检查发动机的燃油压力。 发动机压力表组内含专门说明书, SEHS8907, " 1U-5470 发动机压力表组的使用"。 此说明提供了有关如何使用该表组的的信息。
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