Blow by tube mystery liquid

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by God prefers Diesels, Jan 4, 2021.

  1. Antinomian

    Antinomian Road Train Member

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    Brake fluid from you hydraulic clutch? Sometimes when it's really cold the seals harden up and leak. Mine did. I refilled it and it hasn't leaked since. I was a bit of shocker. I stepped on the clutch one cold morning and it didn't come back up. The reservoir was empty and there was a puddle on the ground.
     
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  3. God prefers Diesels

    God prefers Diesels Road Train Member

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    No, it's mechanical. I wish. Starting to worry this might be a short lived trucking career.
     
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  4. 062

    062 Road Train Member

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    Hopefully not. Isx oil temp is what is supposed to steam off the moisture. If the tube was partially blocked, then I could see it pooling up.
    What’s your guess on how much came out?
     
  5. God prefers Diesels

    God prefers Diesels Road Train Member

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    Maybe a 1/4 cup. It's about eight inches in diameter, but thin. It just doesn't smell or taste like coolant, but I don't know what else it could be.
     
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  6. bigtravelr

    bigtravelr Light Load Member

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    [​IMG]
     
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  7. 062

    062 Road Train Member

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  8. Scooter Jones

    Scooter Jones Road Train Member

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    Dang, man.
     
  9. SmallPackage

    SmallPackage Road Train Member

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    South Texas humid warm winters. Cold wet mornings with warm dry afternoons. Makes the down draft tubes sweat with condensation buildup in the oil vapor and then run out after it gets heavy enough to seperate on its own.

    Not uncommon for the down draft tubes or pcv hoses (on old carburated engines) to be the only hoses sweaty on the outside when sitting overnight.
     
  10. Antinomian

    Antinomian Road Train Member

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    Power steering fluid? That's on the same side as the breather on a CM870 isn't it?
     
  11. loudtom

    loudtom Road Train Member

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    Check any hoses that might be around it. I had a transmission cooler line rub right near the blow by tube on my Volvo, which made the blow by tube look like it could've been the possible source.
     
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