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379 not building any air.

Discussion in 'Peterbilt Forum' started by Eighterfromdecatur, May 27, 2012.

  1. May 27, 2012 #1
    Eighterfromdecatur

    Eighterfromdecatur Bobtail Member

    19
    0
    Apr 10, 2012
    Decatur TX
    0
    I just bought a 87 379 w a 3406B. It has been sitting for 6 o 8 months. Started it up and it failed to build any air. Put a new air governer on it, no change. I felt like the comp wasn't putting out enough air, you can hold your finger over the output fitting for a few seconds before it blows it off so I get a new one, putting out just as much air as the original. Bypassed the air dryer and it still won't build air. Im at a lost unless I got a bad compressor. Any help??
     
    Eighterfromdecatur, May 27, 2012
    Eighterfromdecatur, May 27, 2012
    #1
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  3. May 27, 2012 #2
    bender

    bender Road Train Member

    2,105
    1,356
    Jul 20, 2010
    Don't Kid Yourself
    0
    Have you thoroughly checked the air compressor intake plumbing to be sure the compressor is getting adequate air? Critters like to make homes in trucks that are parked for extended periods.
     
    bender, May 27, 2012
    bender, May 27, 2012
    #2
  4. May 28, 2012 #3
    truckmechanic

    truckmechanic Medium Load Member

    534
    140
    Jan 14, 2012
    Hi Desert Ca
    0
    Check the unloaded @ the compressor.also check the fiber covers air Line that runs from the air compressor discharge line to the air dryer or air tank spray it with soapy water while its atempting to build air obscene chased many air building problems to find the main air line leaking through the inner rubber hose
     
    truckmechanic, May 28, 2012
    truckmechanic, May 28, 2012
    #3
  5. May 28, 2012 #4
    G/MAN

    G/MAN Road Train Member

    7,031
    8,622
    Sep 3, 2010
    0
    Do you hear air when the engine is running? Is it building any air or just not enough to release the brakes?
     
    G/MAN, May 28, 2012
    G/MAN, May 28, 2012
    #4
  7. May 29, 2012 #5
    Gear head

    Gear head Medium Load Member

    532
    91
    Apr 1, 2012
    Belair,md
    0
    Check at intake to see if it is sucking well. Make sure governer is set properly
     
    Gear head, May 29, 2012
    Gear head, May 29, 2012
    #5
  8. May 30, 2012 #6
    G/MAN

    G/MAN Road Train Member

    7,031
    8,622
    Sep 3, 2010
    0
    You may check to see if you plugged the right holes in the air governor. Do you hear air leaking?
     
    G/MAN, May 30, 2012
    G/MAN, May 30, 2012
    #6
  9. May 30, 2012 #7
    kwforage

    kwforage Road Train Member

    1,047
    472
    Jun 3, 2007
    Wisconsin
    0
    read the post wrong... deleted
     
    kwforage, May 30, 2012
    kwforage, May 30, 2012
    #7
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