C-9 Engines for Caterpillar Built Machines Caterpillar


Inlet Manifold Pressure - Test

Usage:

TK711 101
通过比较进气歧管的压力与 技术营销信息 (TMI) 中规定的信息,即可检查发动机的效率。 应在发动机功率下降,但是发动机又没有切实的故障迹象时采用本测试。

TMI 中还列出了进气歧管的正确压力。 这一信息资料是在下述工况下拟定的:

  • 干式大气压力为 99 kPa (29.7 in Hg)

  • 外部气温为 29 °C (85 °F)

  • 温度在 16 °C (60 °F)时美国石油学会 (API) 比重指数为35 API 的燃油

对于增压中冷式发动机,功率会随燃油的比重指数的不同而变化。 进气歧管压力会随燃油的比重指数的不同而变化。 如果燃油等级高于 35 API,则进气歧管的压力可能会低于 TMI 中规定的压力值。 如果燃油等级低于 35 API,则进气歧管的压力可能会高于 TMI 中列出的压力值。

注: 检查进气歧管压力时,应确保进气和排气没有受阻。



图 1g01130168
(1) 增压压力传感器

表 1
需要的工具 
零件号  零件名  数量 
1U-5470
或者
198-4240 
发动机压力表总成
或者
数字式压力指示仪  


图 2g00293196
1U-5470 发动机压力表总成

请参阅专门说明书 , SEHS8907, " 1U-5470 发动机压力表总成的使用 ",了解使用 1U-5470 发动机压力表总成 时需要的说明。

使用下述程序测量进气歧管压力:

  1. 从缸盖上拆下增压压力传感器 ( 1)。

  2. 在缸盖的测压位置连接 1U-5470 发动机压力表总成 。

    注: 必须使用 T 形管或一些其它管路部件,以使增压压力传感器 ( 1) 连接在测试位置上。

  3. 记录数值。

  4. 比较程序 3 中记录的数值与 TMI 中规定的压力值。

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