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Loosing air in secondary tank.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mario 1156, Nov 8, 2015.

Page 1 of 4
  1. Nov 8, 2015 #1
    mario 1156

    mario 1156 Bobtail Member

    26
    1
    Jul 15, 2010
    Miami FL
    0
    Hi, i have a 07 9400i with a cummins engine. I have a problem, I'm loosing air in the secondary tank but only when the truck is running. If i shut the truck off as soon as the dryer kicks, my air will stay at 120psi for a while. I just replace the air dryer. the compressor and the governor are 11 month old. Any idea? please help.

    Thanks.
     
    mario 1156, Nov 8, 2015
    mario 1156, Nov 8, 2015
    #1
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  3. Nov 8, 2015 #2
    HotH2o

    HotH2o Road Train Member

    4,098
    4,865
    Sep 23, 2012
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    Loose air is no good!
     
    HotH2o, Nov 8, 2015
    HotH2o, Nov 8, 2015
    #2
    Pumpkin Oval Head Thanks this.
  4. Nov 8, 2015 #3
    uncleal13

    uncleal13 Road Train Member

    3,797
    6,294
    Apr 9, 2009
    Humboldt, Sk
    0
    I have a Mercedes do that. It was an air line that went to the turbo brake, when you shut off the truck it didn't leak at all.
    I know a Cummins doesn't have an exhaust brake, but could be something that is operated by air. I had to crawl around the engine with it running to hear where it was coming from.
     
    uncleal13, Nov 8, 2015
    uncleal13, Nov 8, 2015
    #3
  5. Nov 8, 2015 #4
    062

    062 Road Train Member

    6,205
    33,434
    Oct 20, 2013
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    Does it have the air operated turbo actuator?
     
    062, Nov 8, 2015
    062, Nov 8, 2015
    #4
  7. Nov 8, 2015 #5
    mario 1156

    mario 1156 Bobtail Member

    26
    1
    Jul 15, 2010
    Miami FL
    0
    How can i tell? there are no air lines going to the turbo.
     
    mario 1156, Nov 8, 2015
    mario 1156, Nov 8, 2015
    #5
  8. Nov 8, 2015 #6
    mario 1156

    mario 1156 Bobtail Member

    26
    1
    Jul 15, 2010
    Miami FL
    0
    I have tried to hear for a leak with the truck running but the engine is to laud.
     
    mario 1156, Nov 8, 2015
    mario 1156, Nov 8, 2015
    #6
  9. Nov 8, 2015 #7
    062

    062 Road Train Member

    6,205
    33,434
    Oct 20, 2013
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    The line would be steel braided,so it won't look like a regular air line.
    With the key on motor off,wait for the fuel pump to cut off. Then listen for air leaks.
    If you have the air operated actuator,the control box is under the power steering pump. Spray the box and line coming off the top,follow it over the top of the motor.
     
    062, Nov 8, 2015
    062, Nov 8, 2015
    #7
  10. Nov 8, 2015 #8
    mario 1156

    mario 1156 Bobtail Member

    26
    1
    Jul 15, 2010
    Miami FL
    0
    i will do that in the morning, thanks
     
    mario 1156, Nov 8, 2015
    mario 1156, Nov 8, 2015
    #8
  11. Nov 8, 2015 #9
    mario 1156

    mario 1156 Bobtail Member

    26
    1
    Jul 15, 2010
    Miami FL
    0
    I could not wait. I saw the line but there is no leak. i built pressure to 120 psi and shut the truck off then put the key on and did not loose pressure.
     
    mario 1156, Nov 8, 2015
    mario 1156, Nov 8, 2015
    #9
  12. Nov 8, 2015 #10
    062

    062 Road Train Member

    6,205
    33,434
    Oct 20, 2013
    0
    With the motor running,sitting still vary your rpm like your going down the road,see if you loose air,if not it's probably a leveling valve or air bag.
     
    062, Nov 8, 2015
    062, Nov 8, 2015
    #10
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