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DD15 crankcase breather

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by LTL Bull, Nov 19, 2020.

  1. Nov 19, 2020 #1
    LTL Bull

    LTL Bull Road Train Member

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    Had the crankcase breather go bad. Was dumping oil out of the bottom like mad. Plug was bad and apparently not throwing a code till it got bad enough to puke oil everywhere. I’m not a mechanic and the owner already replaced it to the tune of 400$. My question is, can someone explain to me what the purpose of this is as opposed to just the old crankcase breather tube and how could it possibly be throwing so much oil out? There is apparently no other issue causing excess pressure in the crankcase.
     
    LTL Bull, Nov 19, 2020
    LTL Bull, Nov 19, 2020
    #1
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  3. Nov 19, 2020 #2
    AModelCat

    AModelCat Road Train Member

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    Recycles the crankcase fumes as they now count crankcase fumes as part of the total emissions from an engine.
     
    AModelCat, Nov 19, 2020
    AModelCat, Nov 19, 2020
    #2
  4. Nov 19, 2020 #3
    LTL Bull

    LTL Bull Road Train Member

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    Appreciate that, I guess I’m curious about the VOLUME of oil it was discharging so quickly. I’d stop for three minutes and have an oil pool the size of my two size 13 boot prints. Is there a lot more blow by in these new fangled engines?
     
    LTL Bull, Nov 19, 2020
    LTL Bull, Nov 19, 2020
    #3
  5. Nov 19, 2020 #4
    spsauerland

    spsauerland Road Train Member

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    Not positive on the Detroit, but ones on Mack/Volvo and early Paccar used oil pressure to operate. Once separator plates become so plugged up, the CCV unit will flood and cause oil to come out the draft tube.
     
    spsauerland, Nov 19, 2020
    spsauerland, Nov 19, 2020
    #4
  7. Nov 19, 2020 #5
    LTL Bull

    LTL Bull Road Train Member

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    Copy that . It was slit of oil . Mt Airy NC to northwest Ohio went through 1.5 gallons.
     
    LTL Bull, Nov 19, 2020
    LTL Bull, Nov 19, 2020
    #5
  8. Feb 18, 2021 #6
    Lockport

    Lockport Light Load Member

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    At 500,000 miles the breathers are supposed to be heat damaged and replacement is recommended. How many miles on this engine when that happened?
     
    Lockport, Feb 18, 2021
    Lockport, Feb 18, 2021
    #6
    shatteredsquare Thanks this.
  9. Feb 18, 2021 #7
    LTL Bull

    LTL Bull Road Train Member

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    Ex Wally World truck. 710,000 when we got it. About 730,000 when it went kerpluuiee
     
    LTL Bull, Feb 18, 2021
    LTL Bull, Feb 18, 2021
    #7
    baha Thanks this.
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