AIR LEAK ON VOLVO 670 2011 with cummins isx

Discussion in 'Volvo Forum' started by RoadRanger^^, Feb 28, 2021.

  1. RoadRanger^^

    RoadRanger^^ Light Load Member

    121
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    Apr 17, 2018
    Columbus, OH
    0
    Hi to everyone.
    It’s been few days maybe a week my truck is leaking air from somewhere, but i can’t find it. So this is what is going on.
    As i accelerate i hear the air leak is louder. 5 seconds before the air dryer makes that sound “pshh” i guess its called before it purges, the air leak is gone and right after it purges leak comes back again and is leaking. the only time the air is not leaking is 5 seconda before it purges.

    what can be ? could be Air dryer, governor, compressor ?

    please help it drives me crazy. boost is good on thegauge
     
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  3. 6cuda6

    6cuda6 Light Load Member

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    Oct 9, 2020
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    Sure it is not coming from the discharge valve on your air dryer? The fact that it stops about 5 seconds before cut out leads me to believe its when system pressure is the highest and that what ever is leaking is "sealing itself".
    Here's what to do so you can check the drier if you dont know were it is or you need to check it but arent sure.......Start the truck, make sure your Park Brake is applied {wouldnt hurt to chalk a wheel as well}, remove the drivers side or passenger side step fairing [which ever side there is under truck access] and crawl under the truck towards the drivers side inner frame rail and about mid sleeper you should see the air drier bolted to the inside of the frame.....put your hand under the discharge valve of the drier, you shouldnt feel or hear air coming out of it...if you do that the problem.......just dont leave your hand there to long as you dont want the drier to discharge on your hand.
    Now if that is not your leaking problem let us know and we will dig into this deeper with you.
     
  4. RoadRanger^^

    RoadRanger^^ Light Load Member

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    Apr 17, 2018
    Columbus, OH
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    thank you for your help my friend. Turned out to be the rubber hose that is coming from the air compressor to the engine intake. I will post pic hopefully will be also helpfull for the next guy.
     

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    Snailexpress and loudtom Thank this.
  5. 6cuda6

    6cuda6 Light Load Member

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    Oct 9, 2020
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    Thanks for taking the time to post the solution and a picture as his will certainly help someone else!!
     
    Snailexpress and RoadRanger^^ Thank this.
  6. Sloppy-Joe

    Sloppy-Joe Bobtail Member

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    Jun 17, 2017
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    When's the last time you had your air dryer cartridge changed?
     
  7. RoadRanger^^

    RoadRanger^^ Light Load Member

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    Apr 17, 2018
    Columbus, OH
    0
    i replaces the whole dryer like 2 years ago i think.
     
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