CAC pipe leaking boost pressure. Help!

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Horsepowerchic, Apr 10, 2020.

  1. Horsepowerchic

    Horsepowerchic Bobtail Member

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    I'll try to make this short as possible.

    I have a 2019 Freightliner Coronado glider w/ 60 series 12.7 Detroit. The other day I noticed an air leak coming from the engine when on the pedal. I got home and sprayed the charge pipe down with soapy water and find a leak. I tried a few thing to stop it, but no luck. (I have had problems with the charge pipes before)

    I ordered new charge pipes, silicone boots, and 8 new clamps from Fitzgerald. I got those put on lightly tightened the clamps, and went for a drive. Right away getting in the high side boost leak, pull over tighten clamps more, boost leak, tighten clamps more, boost leak, and so on.

    Now I might say the charge pipes weren't the problem, but every time I mess with the clamps the tone of the leak changes or goes away (if only for a minute). The only way I have to find the leaks are to rev the engine to 1,900 and spray the boots with soapy water.

    Any ideas are greatly appreciated. Help a girl out!
     
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  3. AModelCat

    AModelCat Road Train Member

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    Where exactly is the soap bubbling from?
     
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  4. Rideandrepair

    Rideandrepair Road Train Member

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    It’s probably the ata cooler leaking. And when you tighten the hoses up, it leaks there more. Check it, especially on the left or turbo inlet side. Often the front side will be leaking where the vanes go into the side header, all the way down
     
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  5. Horsepowerchic

    Horsepowerchic Bobtail Member

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    Where the silicone boots meets any metal pipes. I keep getting them to stop, but still getting leak(s) when I drive and over 10 psi from the turbo. But, can't get to 10 psi sitting in the driveway.
     
  6. Horsepowerchic

    Horsepowerchic Bobtail Member

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    I did try spraying the cooler down, but didn't see anything obvious. I'll try again in the morning. And, when this all started my Daughter was riding with me. We both agreed the leak was on the drivers side. After the new pipes it sounded more on the passenger side. Now after a few hours of chasing the leak(s) it sounds to be on the drivers side again.
     
    Last edited: Apr 10, 2020
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  7. OldeSkool

    OldeSkool Road Train Member

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    I suppose you did this already, but when you take the boots off the pipe did you make sure the pipe was really clean? Sometimes if there is dust or crud on the pipe it can make it not seal very well.

    Also make sure the clamps aren't on the bevel on the pipe. That will definately make them leak. Detroits can be a bit finicky. Other than that idk.
     
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  8. AModelCat

    AModelCat Road Train Member

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    How tight are you putting the clamps? I never bother with the torque specs, just snug them up real good.
     
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  9. Rideandrepair

    Rideandrepair Road Train Member

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    I had a leak once, took a while to find it. The hose from intake manifold to air compressor, on my 12.7 it’s plumbed into the compressor on the backside. Hard to get at, up against the block, big 1” silicone hose.
     
  10. Horsepowerchic

    Horsepowerchic Bobtail Member

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    I started off not very tight at all, but as I'm finding and trying to stop leaks. I find I have to tighten the clamps all the way down till the spring is bottomed out.
     
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  11. Horsepowerchic

    Horsepowerchic Bobtail Member

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    Oh, you mean this hose with the giant hole in it? How do I get it off the compressor? 20200411_110835.jpg
     
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