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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 27, 2020 #11
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Ok. I have no answer for for that. Have seen some strange things caused by slide valves in the compressor head. Restricted airline to governor res port, restricted air dryer and bad reed valves in the compressor inlet port. Will be interesting to learn what is going on.
     
    BoxCarKidd, Jul 27, 2020
    BoxCarKidd, Jul 27, 2020
    #11
    Rideandrepair Thanks this.
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  3. Jul 28, 2020 #12
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    :(:(
    I’ll let ya know got a friend who recently went out on his own as a mobile wrench coming later this week to re seal injector cups
     
    Diesel Dan 92, Jul 28, 2020
    Diesel Dan 92, Jul 28, 2020
    #12
    BoxCarKidd Thanks this.
  4. Jul 28, 2020 #13
    bad-luck

    bad-luck Road Train Member

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    Have you replaced the pop off valve? It is cheap. Could be a bad purge valve on the air dryer
     
    bad-luck, Jul 28, 2020
    bad-luck, Jul 28, 2020
    #13
    Diesel Dan 92 Thanks this.
  5. Jul 29, 2020 #14
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    yes I have replaced the pop off valve
     
    Diesel Dan 92, Jul 29, 2020
    Diesel Dan 92, Jul 29, 2020
    #14
  7. Jul 29, 2020 #15
    bad-luck

    bad-luck Road Train Member

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    Maybe a bad purge valve on the dryer. Or possibly the air governor
     
    bad-luck, Jul 29, 2020
    bad-luck, Jul 29, 2020
    #15
    Diesel Dan 92 Thanks this.
  8. Jul 29, 2020 #16
    spsauerland

    spsauerland Road Train Member

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    Have you pressure tested and made sure unloader in compressor is working?
     
    spsauerland, Jul 29, 2020
    spsauerland, Jul 29, 2020
    #16
    Diesel Dan 92 Thanks this.
  9. Jul 30, 2020 #17
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    governor has been replaced, I will look into purge valve thanks.
     
    Diesel Dan 92, Jul 30, 2020
    Diesel Dan 92, Jul 30, 2020
    #17
  10. Jul 30, 2020 #18
    Diesel Dan 92

    Diesel Dan 92 Light Load Member

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    I have not. How does one go about testing the unloader?
     
    Diesel Dan 92, Jul 30, 2020
    Diesel Dan 92, Jul 30, 2020
    #18
  11. Jul 31, 2020 #19
    spsauerland

    spsauerland Road Train Member

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    I use a setup like this. KIMG2518.JPG
    Put air to it and see if it leaks off. Your compressor is probably a Bendix BA921. Two torx bolt cover is unloader. Kit is K109119.
     
    spsauerland, Jul 31, 2020
    spsauerland, Jul 31, 2020
    #19
    Diesel Dan 92 and BoxCarKidd Thank this.
  12. Aug 2, 2020 #20
    bad-luck

    bad-luck Road Train Member

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    The unloader valve is cheap. You can take it out and check it. Sometimes it can get carbon build up and not work properly. Or the spring can break or become weak
     
    bad-luck, Aug 2, 2020
    bad-luck, Aug 2, 2020
    #20
    Diesel Dan 92 Thanks this.
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