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air problem

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

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  1. Jul 25, 2020 #1
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    2006 T800 with 2005 C15MXS motor.


    Under acceleration the compressor safety valve sometimes will pop off.

    Running the truck in the shop the air builds to 125 and purges, It only does it at high rpm / load

    I'm stumped.
     
    Diesel Dan 92, Jul 25, 2020
    Diesel Dan 92, Jul 25, 2020
    #1
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  3. Jul 25, 2020 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    I would thank it hard to know it is the compressor safety valve while driving down the road. You mentioned the air pressure in the shop. What is the air pressure on the gauges when you hear a pop off on the road?
     
    BoxCarKidd, Jul 25, 2020
    BoxCarKidd, Jul 25, 2020
    #2
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  4. Jul 26, 2020 #3
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    It is the safety valve, for sure.

    Pressure on the the gauges is usually 110-125


    I've run shop are through the main discharge line and it doesn't seem restricted at all.
     
    Diesel Dan 92, Jul 26, 2020
    Diesel Dan 92, Jul 26, 2020
    #3
  5. Jul 26, 2020 #4
    AModelCat

    AModelCat Road Train Member

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    Are you sure its the compressor valve popping off?

    I don't know about the MXS for sure but some engines/trucks used a similar valve post-turbo as a safety valve to prevent overboost.
     
    AModelCat, Jul 26, 2020
    AModelCat, Jul 26, 2020
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  7. Jul 26, 2020 #5
    spsauerland

    spsauerland Road Train Member

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    That safety valve does go bad, sounds like a machine gun. I remember replacing couple on ACERT engines.
     
    spsauerland, Jul 26, 2020
    spsauerland, Jul 26, 2020
    #5
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  8. Jul 26, 2020 #6
    BoxCarKidd

    BoxCarKidd Road Train Member

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    That did not answer the question of what are the air pressure gauges reading while a relief valve is popping off.
     
    BoxCarKidd, Jul 26, 2020
    BoxCarKidd, Jul 26, 2020
    #6
    Rideandrepair Thanks this.
  9. Jul 27, 2020 #7
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    yes it did, the valve pops at those pressures.
     
    Diesel Dan 92, Jul 27, 2020
    Diesel Dan 92, Jul 27, 2020
    #7
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  10. Jul 27, 2020 #8
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    yes I am, ive already had to replace one because it wore out from popping off and wouldn’t hold.
     
    Diesel Dan 92, Jul 27, 2020
    Diesel Dan 92, Jul 27, 2020
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  11. Jul 27, 2020 #9
    062

    062 Road Train Member

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    What psi are you replacing it with?
     
    062, Jul 27, 2020
    062, Jul 27, 2020
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  12. Jul 27, 2020 #10
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    It was 150 or 200 I’d have to double check
     
    Diesel Dan 92, Jul 27, 2020
    Diesel Dan 92, Jul 27, 2020
    #10
    Rideandrepair Thanks this.
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