air problem

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Diesel Dan 92, Jul 25, 2020.

  1. Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    Nov 27, 2015
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    looks fine to me. Headscratcher.
     

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  3. bad-luck

    bad-luck Road Train Member

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    Nov 16, 2013
    Baltimore, Maryland
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    Ok, look down with a flashlight in the hole for carbon build up. If there is some, it is usually where it seats. If there is carbon you can clean it with the tools that come in a gun cleaning kit
     
  4. spsauerland

    spsauerland Road Train Member

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    May 31, 2010
    West Harrison, In
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    That's just the balance piston and spring. Pull out the unloader piston.
     
    Diesel Dan 92 and BoxCarKidd Thank this.
  5. Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    Nov 27, 2015
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    Update. Replaced with a new 250psi valve and all is normal last 400 miles.
     
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