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Peterbilt 579 Air leak

Discussion in 'Trucks [ Eighteen Wheelers ]' started by stark21, Nov 21, 2020.

  1. Nov 21, 2020 #1
    stark21

    stark21 Light Load Member

    128
    5
    Jul 25, 2010
    Virginia Beach
    0
    I have a 2017 pete 579 that I found a small air leak coming from inside the engine area, it has the MX13 it's coming from this this white air line going into a small inlet that if I push the line down it stops. does anyone know what this is supplying air to. I am new to the MX13 engine.
     

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    stark21, Nov 21, 2020
    stark21, Nov 21, 2020
    #1
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  3. Nov 22, 2020 #2
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    The air line supplies air to the aftertreatment air shutoff valve. The air purges fuel from the Dosing line after regeneration or dosing is completed. Its one of the lovely push/quick connect fittings we all love. Due to engine vibrations they are prone to leakage. Dealer should have the exact replacement fitting or if you are inclined to a trip to the parker store may adapt to a compression style for a better fix.
     
    Goodysnap, Nov 22, 2020
    Goodysnap, Nov 22, 2020
    #2
    AModelCat, spsauerland and stark21 Thank this.
  4. Nov 22, 2020 #3
    stark21

    stark21 Light Load Member

    128
    5
    Jul 25, 2010
    Virginia Beach
    0
    aha ok thanks, just another great design by paccar.. still trying to figure out if it's the line or the brass fitting that's leaking, I am leaning towards the brass fitting being the issue..
     
    stark21, Nov 22, 2020
    stark21, Nov 22, 2020
    #3
    Goodysnap Thanks this.
  5. Nov 22, 2020 #4
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    Its not just Paccar, the whole industry uses these fittings to speed assembly. They just dont last on real world environment. You can try to cut back the line to see if it reseals. The oring is likely worn in the fitting.

    Your welcome.
     
    Goodysnap, Nov 22, 2020
    Goodysnap, Nov 22, 2020
    #4
    spsauerland, stuckinthemud and stark21 Thank this.
  7. Nov 22, 2020 #5
    stark21

    stark21 Light Load Member

    128
    5
    Jul 25, 2010
    Virginia Beach
    0
    ok will do.. thanks again.
     
    stark21, Nov 22, 2020
    stark21, Nov 22, 2020
    #5
    Goodysnap Thanks this.
  8. Nov 22, 2020 #6
    stark21

    stark21 Light Load Member

    128
    5
    Jul 25, 2010
    Virginia Beach
    0
    after looking again it's leaking from the top of the quick connect if I push down on it like to remove the air line it stops, so probably will just replace with a compression fitting.. can't feel any air coming from where the threads go into.
     
    stark21, Nov 22, 2020
    stark21, Nov 22, 2020
    #6
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