VAC gauge

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by hoffa660, Dec 7, 2019.

  1. hoffa660

    hoffa660 Bobtail Member

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    Feb 14, 2015
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    Can anyone tell me what this gauge is for? And what numbers it should run? It's in a 2001 Freightliner classicXL with a 1994 N14 Cummins celectplus engine 525hp. I've looked everywhere and I can't find anything on it and what it should read.
     

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  2. Roberts450

    Roberts450 Road Train Member

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    Air filter restriction gauge. Should read 0-5” of H2O under hard pulls and if it starts going over 20 the filters are starting to get pretty plugged up.
     
    Goodysnap Thanks this.
  3. hoffa660

    hoffa660 Bobtail Member

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    Feb 14, 2015
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    Oh ok yeah under hard pulls it's been getting up to 8, the turbo usually gives between 23-27psi depending where my rpms are. Air filters were replaced in March got 74k on them. What's the usual life span of them in dual breather setup? I run kck to Oregon and back dedicated
     
  4. Roberts450

    Roberts450 Road Train Member

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    My 389 with a 600 x15 wont pull my restriction gauge over 1 and I have 237,xxx and two years on the factory installed filters. My 15” donaldsons I think are bigger then the filters on your classic, so if you’re pretty much just on the big road like me then you should get a year+ out of them.
     
    pushbroom and spsauerland Thank this.
  5. Final Drive

    Final Drive Medium Load Member

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    Jan 21, 2015
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    I thought that the Celect Plus was introduced in 1997....
     
  6. Slowpoke KW

    Slowpoke KW Heavy Load Member

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    What type of line runs to it? It could also be a fuel filter restriction gauge.
     
  7. Roberts450

    Roberts450 Road Train Member

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    Fuel is normally in inches of Hg not H2O.
     
  8. Final Drive

    Final Drive Medium Load Member

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    Jan 21, 2015
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    Could be a air filter service gauge..
     
    dibstr Thanks this.
  9. dibstr

    dibstr Road Train Member

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    Sep 10, 2010
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    It is
     
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