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Air Compressor Leaking Oil?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by PE_T, Oct 10, 2019.

  1. Oct 10, 2019 #1
    PE_T

    PE_T Road Train Member

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    Texas (trucking since 02/2013)
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    I think my air compressor is leaking oil. It’s not really leaking on the ground. I’m seeing some black oil under the compressor. Is it time to replace the air compressor? This is on a 2014 Freightliner Cascadia DD15. I don’t think the air compressor has ever been changed.
     

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    PE_T, Oct 10, 2019
    PE_T, Oct 10, 2019
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  3. Dec 13, 2025 #2
    wkbmarine

    wkbmarine Bobtail Member

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    I know this is a very old post, but my compressor is wet with oil at this exact spot. I recently had the overhead run and this leak showed up a couple of days later. Did you ever determine what the issue was on yours?
     
    wkbmarine, Dec 13, 2025
    wkbmarine, Dec 13, 2025
    #2
  4. Dec 13, 2025 #3
    bad-luck

    bad-luck Road Train Member

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    Usually when it starts leaking like that, it is at the end of its life.
     
    Last edited: Dec 13, 2025
    bad-luck, Dec 13, 2025
    bad-luck, Dec 13, 2025
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  5. Dec 13, 2025 #4
    Lane=addict

    Lane=addict Light Load Member

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    Get a new compressor sounds like the right plan.
     
    Lane=addict, Dec 13, 2025
    Lane=addict, Dec 13, 2025
    #4
  7. Dec 13, 2025 #5
    062

    062 Road Train Member

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    Depending on mileage, the o-ring may have gotten hard allowing oil to leak.
     
    062, Dec 13, 2025
    062, Dec 13, 2025
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    Rideandrepair Thanks this.
  8. Dec 17, 2025 #6
    Rideandrepair

    Rideandrepair Road Train Member

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    I agree with 062. Is that the fuel pump mounted at the end? If so, maybe just a gasket or o ring.
     
    Rideandrepair, Dec 17, 2025
    Rideandrepair, Dec 17, 2025
    #6
    062 Thanks this.
  9. Dec 17, 2025 #7
    062

    062 Road Train Member

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    Power steering pump
     
    062, Dec 17, 2025
    062, Dec 17, 2025
    #7
    Rideandrepair Thanks this.
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