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Excessive Haze from Blowby Pipe and Oil Cap '86 DT466

Discussion in 'International Forum' started by Airman89, May 4, 2016.

  1. May 4, 2016 #1
    Airman89

    Airman89 Light Load Member

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    I'm just trying to figure out what is causing this excessive haze from the Blowby tube and when I remove oil cap it's equally as bad. Enough comes out to make it look like it's an exhaust pipe. It's been this way since I got it. Oil pressure sits at a steady 60/90psi. It is using some oil, maybe 1/2 gallon for 1500/2000 miles. Not using any coolant. Could a plugged up Blowby pipe cause this? Is there a filter that could plug up? Thank you
     
    Airman89, May 4, 2016
    Airman89, May 4, 2016
    #1
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  3. May 4, 2016 #3
    DougA

    DougA Road Train Member

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    You have 90 psi oil pressure?
     
    DougA, May 4, 2016
    DougA, May 4, 2016
    #3
  4. May 4, 2016 #3
    Broke_and_Hungry

    Broke_and_Hungry Light Load Member

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    Feb 26, 2008
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    ^^It is a 1986, oil pressures were much higher some years back.
     
    Broke_and_Hungry, May 4, 2016
    Broke_and_Hungry, May 4, 2016
    #3
  5. May 4, 2016 #4
    Airman89

    Airman89 Light Load Member

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    Yes 90 psi when under a load. Is this high for the motor? I know my kenworth would run around 40/50 but I heard these run a lot higher
     
    Airman89, May 4, 2016
    Airman89, May 4, 2016
    #4
  7. May 4, 2016 #5
    RustyBolt

    RustyBolt Road Train Member

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    Bement, IL
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    Whats the haze smell like? Mine smelled like exhaust (with a mix of coolant, bad head) for the most part. Ended up rebuilding it after it broke a ring and took 4 gallons of oil to go 250 miles.
     
    Last edited: May 4, 2016
    RustyBolt, May 4, 2016
    RustyBolt, May 4, 2016
    #5
  8. May 4, 2016 #6
    ShooterK2

    ShooterK2 Road Train Member

    5,533
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    Dec 14, 2012
    Oklahoma
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    My N14 has quite a bit of blowby as well, but doesn't burn a bit of oil between 15,000 mile changes. I don't really understand it either, but it runs fine, so I'm not gonna concern myself with it until it shows me something else that makes me think it needs a rebuild. If the rings were bad, it would be burning oil.
     
    ShooterK2, May 4, 2016
    ShooterK2, May 4, 2016
    #6
    Big_D409 Thanks this.
  9. May 4, 2016 #8
    Airman89

    Airman89 Light Load Member

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    Jul 8, 2015
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    I can't really distinguish any specific smell from it. My truck does burn some oil but after its warmed up there is no visible oil burning. The exhaust does have a strong odor though, not like oil. the Blowby smells similar to exhaust though. We haven't used any coolant yet and we've gone about 3500 miles since I purchased this truck.
     
    Airman89, May 4, 2016
    Airman89, May 4, 2016
    #8
  10. May 4, 2016 #8
    baha

    baha Road Train Member

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    Go to parts store an buy a oil test kit, then next time you change the oil fill the jar and mail it in then you will get a report back to your e/mail on whats showing wear inside the motor.
     
    baha, May 4, 2016
    baha, May 4, 2016
    #8
  11. May 5, 2016 #9
    DougA

    DougA Road Train Member

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    90 is way to high.Either you have diluted oil (fuel,coolant),malfunctioning gauge or oil pump regulator issues.Have you changed the oil and done an oil analysis?Call IH truck garage,and ask.Max oil pressure would be 60 65psi.Blowby is compression in the crankcase.Worn cylinders,rings,etc.
     
    DougA, May 5, 2016
    DougA, May 5, 2016
    #9
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