Loosing air pressure when engine is running.

Discussion in 'Ask An Owner Operator' started by Aaag, May 17, 2024.

  1. Aaag

    Aaag Bobtail Member

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    May 17, 2024
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    Tomorrow will block the lines going to airbags and check the pressure.
     
    silverspur Thanks this.
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  3. Constant Learner

    Constant Learner Medium Load Member

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    The Moon
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    Or it's not.
     
  4. uncleal13

    uncleal13 Road Train Member

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    I had a 2006 Century with the MBE4000 engine, had an air line come off the bottom of the turbo, think it actuated the variable vanes or something like that. It lost a lot of air while running, zero air loss when shut off, but with the air line off it made so much noise that I was able to track it down. Not at all the same engine as the DD15, but they are both designed by Daimler-Benz.

    The ultrasonic leak detector can be used on a running engine, but it takes some practice to get use to the sounds that you are looking for.
     
  5. BoostedTeg

    BoostedTeg Road Train Member

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    Check the fan hub I had the same thing on mine couple years ago.
     
  6. shatteredsquare

    shatteredsquare Road Train Member

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    middle dirt
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    just lots of little plastic parts, always breaking = always in stock
     
    Kenworth6969 Thanks this.
  7. ElmerFudpucker

    ElmerFudpucker Medium Load Member

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    And always replacing… at the worst possible time.
     
  8. abyliks

    abyliks Road Train Member

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    ludlow MA
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    considering they only rolled out of the factory with one to begin with…
     
  9. Aaag

    Aaag Bobtail Member

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    Today disconnected air lines out of secondary tank and blocked fitting connected to the tank .started with blue 3/8 no change the silver one 3/8 YES IT IS the silver one air built very fast and holding pressure for long time .followed this line is going to device on the engine under the turbo from the device blue hose connected to the turbo by using ultra sound device heard noise behind these devices to the engine and to the turbo its hard to hear this leaking by naked ear when engine is running and no bubbles.
     
    xsetra Thanks this.
  10. Antinomian

    Antinomian Road Train Member

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    That's the turbo waste gate actuator. Freightliner won't sell you one (sorry bastids!). They want you to buy a whole new turbo. You can find lots of replacement actuators on line and I'm pretty sure I've seen a video on how to replace it. You will have to remove the turbo though.

    BTW there are completely crazy price differences. I've seen them as low as $45 and as high as $500.
     
    Last edited: May 18, 2024
    shatteredsquare and Aaag Thank this.
  11. Aaag

    Aaag Bobtail Member

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    May 17, 2024
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    Yes when disconnect the harness from VPOD air stop leaking from wastegate solenoid .thank you.
     
    201773 Thanks this.
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