Oil in airtanks.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Hendrix404, Jan 24, 2021.

  1. Hendrix404

    Hendrix404 Bobtail Member

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    Oct 1, 2020
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    Cascadia 2020
    220 000 miles DD15

    Good day, gentleman's!

    So, starting this winter I start gaining some water in air tanks, that freezes the lines if engine is off. So, I changed air dryer cartridge 2 weeks ago. Besides, mechanic put some air system antifreeze liquid. A week ago same thing happened again - it froze in the morning. After starting up the engine, I drained airtanks - and milky-colored water starts coming out. This morning, while draining, a Hershey chocolate topping starts coming out - a couple ounces.

    Could it be an antifreeze liquid, if not oil?

    And if it is oil - does warranty covers air compressor? I got 220 000 miles on a truck.
     

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  3. AModelCat

    AModelCat Road Train Member

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    Looks like engine oil. I would pull the discharge line off the compressor and see if there is fresh oil there. Chances are its the compressor. Unfortunately, you'll more than likely need a new air dryer cartridge as well if the compressor is passing oil.
     
    black_dog106 Thanks this.
  4. Rideandrepair

    Rideandrepair Road Train Member

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    Might just be leftover from what mechanic put in. I’d put some more air brake conditioner in it. They say not to use alcohol, but I have plenty of times. Pour it right into the steel braided line off compressor, so it gets through the whole system. Drain tanks some more till they look fairly clean. I don’t drain my tanks regularly to be honest. When I do, they’re often a little cruddy. All kinds of milky or oily junk come out.
     
    lwlevens Thanks this.
  5. Caterpillar Cowboy

    Caterpillar Cowboy Heavy Load Member

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    I would recommend if you choose to add alcohol to do it into the line coming OUT of the air dryer.

    Alcohol is pretty tough on the desiccant cartridges from what I've been told.
     
  6. Caterpillar Cowboy

    Caterpillar Cowboy Heavy Load Member

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    Wyoming
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    I would get after fixing what is causing the oil in your air system, likely the compressor but could be a few other things.

    Usually when the tanks let crap like that out my wintertime air issues won't be solved till the whole air dryer gets replaced after the new compressor.
     
  7. Hye

    Hye Bobtail Member

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    Jan 23, 2021
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    Your truck may have wabco air drier. I would not worry about this. Just keep letting it out. Summertime it may stop.
     
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