Oil dripping from breather tube on fresh rebuild.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cascadia, Apr 17, 2022.

  1. Cascadia

    Cascadia Light Load Member

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    I'd be ok if it burns oil for 6 months untill ring seats but I can not deal with the oil getting everywhere under the truck, heck, im fine adding a gallon or two evwry 5 tho miles.
    Did the guy you met also had oil dripping out of breather tube?
     
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  3. Cascadia

    Cascadia Light Load Member

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    Top ring has a mark (Little dot) gotta face piston dome, and theres only one way to install second ring as they are chamfered, both oriented 180° apart.
    Ok, to check air compressor you say to remove braided hose then what... Remove oil feed line and use shop air at the fitting where I disconnected braided hose and look for air out of feed tube from compressor?
     
    Last edited: Apr 18, 2022
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  4. Cascadia

    Cascadia Light Load Member

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    There's no smoke coming out the stacks other than black when shifting hard, we all know it's unburned fuel... I really want to believe it is the turbo (not even a year old) or the air compressor cause if I had installed the top piston rings wrong (I doubt it) you would see blue smoke coming out of the stacks and the engine wouldn't run so well but you would indeed see a lot of compressed air being pushed into the oil pan creating a lot of fumes and thats whats happening.
    Im going crazy.
     
  5. wore out

    wore out Numbered Classic

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    The air compressor I have seen cause it to use oil by pushing it into the intake via the inlet line of the compressor. That’s easy to see as inside of inlet line will be oil soaked. I have also seen them push oil through the hot line into the tanks. I have not seen one pressure up the inside of the engine and push oil out. Not that I’ve seen everything by any means.

    I have seen 2 turbos loose boost to the engine through the seal on cold side however they did not create a oil loss condition, loss of hp was the complaint. Not saying they cannot cause one to loose oil but it would be rare.
     
  6. Cascadia

    Cascadia Light Load Member

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    Thats whats driving me insane...
    I thought if turbo goes bad it will push air inside the engine but I understand now it will only use oil by sending it to either intake manifold through suction hose which is dry, or send oil to the air tanks that I already opened the little drain valve and no sign of oil or even water, but if that was the case I would be seeing smoke out exhaust and theres none.
    My turbo boost did improved after the inframe, I almost hit 30 psi, prior to that I only saw around 28.
     
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  7. wore out

    wore out Numbered Classic

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    You don’t always have smoke with oil consumption on a Diesel engine. Though you should see some in back of the turbo. If I understand what you have going on it’s pushing oil out the blow by tube......a bad hole or several bad holes doesn’t necessarily mean it’s burning it. Do you know if it has piston cooling nozzles or not? If not the odds of a bad hole and not burning oil get better.
     
  8. Cascadia

    Cascadia Light Load Member

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    It does have oil cooling nozzles, its the BK model and to my surprise number 6 was broken when I removed it.
     
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  9. bad-luck

    bad-luck Road Train Member

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    Did you get a new head and was the block cut? Either way, you need to take it back to the person who rebuild the engine.
     
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  10. Cascadia

    Cascadia Light Load Member

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    A rebuilt one by Detroit Diesel, and one of the intake valves seal was all the way up...I did removed the spring and fixed it but that should not cause the oil slobbering out the breather at least not this much.
    I did the inframe.
     
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  11. bad-luck

    bad-luck Road Train Member

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    Ok. Possibly one of rings didn't seat properly.
     
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