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  1. Azraelo

    Converting signals for transmission sensor

    Hello! So I'm replacing a transmission in a truck and the speed sensor (in the output shaft of each transmission) is not the same. According to my oscilloscope, these are the signals from old speed sensor. (rectangular waves) And these are the signals from the new speed sensor. (rectangular...
  2. Azraelo

    Interpretation of fuel analysis

    Hello everybody. This customer has been complaining about fuel filter saturation. This engine is for interstate bus application here, running on Biodiesel 5. He states that his filters gets clogged too often. Fuel sample has been taken from its fuel tanks. The results are attached. I suspect of...
  3. Azraelo

    Synthetic oil: one-size-fits-all?

    Hello! So this European oil maker states that its synthetic oil can work properly in both: Otto and Diesel engines (automotive applications). It states having many decades of experience to back its product. Even further, it claims that this oil can work safely with almost any popular fuel (CNG...
  4. Azraelo

    Piston and liner failure analysis

    Hello everybody. This engine is a dedicated, stock, heavy duty engine, running on CNG for city bus applications. It is 1900 hours old (equals to aprox 39000 Kilometers). Last oil change 2000 Kilometers ago. Customer refers that engine shutted down 2 times when running at full load. When...
  5. Azraelo

    Exhaust valve failure analysis

    Hi again! I will try to solve some of your questions: It is a mass-produced, dedicated, non-modified engine running on natural gas. According to specifications, it is single point injected, lean-burn engine. It can be as lean as 23:1 (40% excess air) depending on load conditions. No temp...
  6. Azraelo

    Exhaust valve failure analysis

    Hi everybody! Please take a look at these photos. An exhaust valve failed in an automotive natural gas engine. The engine is new, just 1400 hours (around 28000 Kilometers). Operator complains about low output power and vibration. No remarkable fault codes logged in ECU (just 3 counts of oxygen...
  7. Azraelo

    Oil for differential gears

    Hi! I've got a Chinese light truck, in its rear axle differential service manual it says "Use 85W-90 GL4 oil". In the repair shop I have 80W-140 GL-5 oil, so I decided to use it. The enviromental temperatures here is around 30° C average so I think the viscosity difference is not an issue. Since...
  8. Azraelo

    Pressure drop inside pumps seal

    Hi! Could you help me, please? I'm reading a manual about pressure drops along a pump seal. I understand that the mechanical seals have two parts: stationary seal and rotationary seal. Between them there is a gap, and the gap is filled with the pumped fluid. But I don't understand very well why...
  9. Azraelo

    WABCO Turbocharged compressors

    Hi. I have always seen compressors intake after the air filter and before turbocharger. But in these new Cummins BGE5-200 engines, compressor intake is after the aftercooler. (and, obviously after the turbo). So this new compressors are "turbocharged". What's the technical reasons? The only...
  10. Azraelo

    Standard for filling station (fuel station)

    Thanks for your answer. As you supposed, I mean "dispenser". What is the minimun distance between this dispenser and the nearest spark?. We are trying to build a private filling station inside our garage (it is a big garage for our buses). But there is a small welding workshop inside our garage...
  11. Azraelo

    Standard for filling station (fuel station)

    Hello. What is the minimum distance between a spark (cigarrete, matches, lighters)and a fuel pump in a filling station (fuel station). I know this distance is 150 feet (50 meters) but I don`t know what Standard applies. Maybe NFPA? What NFPA? I was looking in NFPA 30, but I didn't find this...
  12. Azraelo

    Polyethylene pipe Test

    Hello everybody. I'm looking for alternative methods for leak and pressure tests in polyethylene pipelines (PE pipes), rather than classic hydrotest. I was reading about gas tracers, but they are a very time-consuming alternative. The acoustic test is appropiate for this material? Is there...
  13. Azraelo

    Hydrostatic test - Zinc Refinery

    I was looking for information about hydrostatic test in Zinc Refinery pipelines. Is ASME B31.11 the right code for this application? If not, what is the right code? I was reading, and the pipelines for this application are made of HDPE (High density polyestirene) or Stainless Steel. I'll be...

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