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Checking boost system for leak?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by DarrenL, May 19, 2016.

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  1. May 19, 2016 #1
    DarrenL

    DarrenL Bobtail Member

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    Apr 14, 2016
    Dresden, On. Canada
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    I know i have read on here about testing the boost system for leaks and i have tried to read back on different threads to see how but cant seem to find what i am looking for. My question is how do i do this? Im assuming hook it to my shop air compressor turn regulator down to 30 or 40 psi but where do you guys plumb it in at? I know theres some sharp fellas on here that this will be a no brainer to them...thanks in advance to you guys. Its a 3406e cat in a 1996 379Pete.
     
    DarrenL, May 19, 2016
    DarrenL, May 19, 2016
    #1
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  3. May 19, 2016 #2
    AModelCat

    AModelCat Road Train Member

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    To check CAC you need to remove intake pipes from the cooler. Then they put special blanking plugs in the boots to seal the cooler off. Plugs also have safety chains that tie onto truck in case the plugs blow out. 1 blanking plug has a regulator plumbed into it. Cooler is pressured to mfg spec and monitored for pressure loss over a specified time period. Excessive pressure loss indicates a cooler that needs to be replaced due to a leak.
     
    AModelCat, May 19, 2016
    AModelCat, May 19, 2016
    #2
    DarrenL and TheDude1969 Thank this.
  4. May 19, 2016 #3
    TheDude1969

    TheDude1969 Heavy Load Member

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    NorthernMechanic is correct.

    The way I tested mine, by myself (insert idiot warning here). PVC pipe from local hardware shop. I bought two ends, and caps. Threaded a brass fitting into it. used the existing hose and clamps to secure the caps. Pressurized it to a constant 30psi, and sprayed soapy water to find the leak(s). Worked perfect, and cost $10-20.
    Good luck!
     
    TheDude1969, May 19, 2016
    TheDude1969, May 19, 2016
    #3
    dustinbrock, RustyBolt, ExOTR and 1 other person Thank this.
  5. May 19, 2016 #4
    DarrenL

    DarrenL Bobtail Member

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    Apr 14, 2016
    Dresden, On. Canada
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    Hey thanks guys. We probably have enough stuff sitting around the shop to do that. Northernmechanic youre probably rolling your eyes at that....so...maybe you could take a break from the ash and smoke out there and head east to Ontario and check this thing the legit way?? ;)
     
    DarrenL, May 19, 2016
    DarrenL, May 19, 2016
    #4
  7. May 19, 2016 #5
    TheDude1969

    TheDude1969 Heavy Load Member

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    P.S. I'm sure others can get creative with this and test intake gasket etc... But NEVER leave your turbo connected! Any spinning it does will not be oiled.
     
    TheDude1969, May 19, 2016
    TheDude1969, May 19, 2016
    #5
  8. May 20, 2016 #6
    AModelCat

    AModelCat Road Train Member

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    No ash and smoke out here. Taking a forced vacation in BC and its been raining steady the last couple days.
     
    AModelCat, May 20, 2016
    AModelCat, May 20, 2016
    #6
    TheDude1969 Thanks this.
  9. May 20, 2016 #7
    lester

    lester Midwest's #1 Feed Hauler

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    I always get a kick out of how badly people worry about the turbo spinning with no oil.
    And I'm a shade tree wrench at best.
    However I'd bet you a new turbo that you could let that wheel and bearing spin in the breeze for days with no damage. It's the heat and pressure and very fast speeds of your turbo when it's actually on s running engine that would kill it fast with no oil.

    Anyone else agree?
     
    lester, May 20, 2016
    lester, May 20, 2016
    #7
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  10. May 20, 2016 #8
    little cat 500

    little cat 500 Road Train Member

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    i agree 100% lester not realy sure how the turbo is going to spin with the motor not running in the first place
     
    little cat 500, May 20, 2016
    little cat 500, May 20, 2016
    #8
    DarrenL and TheDude1969 Thank this.
  11. May 20, 2016 #9
    ClineER

    ClineER Light Load Member

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    Apr 27, 2016
    N.E. Oklahoma
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    While you can plug both sides of cooler I like to pull pipe off turbo and pressurize with intake connected to inlet of motor. Ive seen guys pressure up cooler but miss intake manifold or air compressor inlet leaking
     
    ClineER, May 20, 2016
    ClineER, May 20, 2016
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    DarrenL and TheDude1969 Thank this.
  12. May 20, 2016 #10
    DarrenL

    DarrenL Bobtail Member

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    Apr 14, 2016
    Dresden, On. Canada
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    The problem where i think i have a leak is right on the outlet side of the turbo where the pipe connects so would it not hurt then to remove the pipe from the cooler on the drivers side and hook aircompressor there? I wondered if turbo would be able to spin with motor not running it should dead head right?
     
    DarrenL, May 20, 2016
    DarrenL, May 20, 2016
    #10
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