Question about Hyundai Tucson

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Oil from turbo mixes with air resulting in huge volume of black smoke. Likewise, oil from turbo seeps thru connection between aluminum pipe connecting turbo and rubber pipe with nylon coating connected to the intercooler. What are the possible causes why oil seeps thru turbo? I already installed brand new turbo. Engine was newly overhauled. Thanks.

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Your turbo has provisions for oil to cool bearings and the seals have blown out, although from my experience the result is white smoke if it is pumped into the hot exhaust. The reason it goes is usually a combination of things-high boost at cold temperatures, thicker oil under start up conditions or running oil that is a higher viscosity than recommended. Your crankcase pressures, the condition of the PCV and subsequent systems also contribute to this problem

The return path from the turbo is sometimes the issue and has to be clear, and I think the turbo seals could be bad, but black smoke is usually associated with excessive fuel.. You will also get alot of smoke when the oil return is slow to return the oil to the sump and it backs up into the turbo. It forces it's way out of the seals making it smoke.

Posted on Mar 24, 2011

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Sounds like a bad turbo to me. When you "kick it in", the engine falters and you get black smoke for a while. What is probably happening is that the turbo is leaking oil into the intake air stream, putting it into the cylinders with the fuel/air mix and causing one of two issues. Either the oil is inhibiting the combustion process, causing the falter and the resulting poor ignition, plus the oil, is giving black smoke, OR, the oil in the cylinders is fouling the plug momentarily, resulting in the fuel/oil being passed into the exhaust stream, burned in the catalytic converter and exits as black smoke. If it runs OK except when under turbo load, have that thing checked out ASAP. And, as far as the light staying on, most faults will set permanently after they occur three or more times within a certain period of time. This is ti ensure that intermittent faults won't cause false setting of the light.

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If you are adding oil to the engine I would say the rings or valve guides are worn out. Could also be a problem with the PCV valve.
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How much oil are you adding every day? And what level is the oil dipstick showing usually? Sometimes overfilling the engine with to much oil can cause this.

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Thanks. Keep updated for any more query. You can rate this solution and show your appreciation

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White smoke inducates the Vatican has elected a new Pope!

No, really... White smoke means that somehow oil has seeped into the intake manifold, which could mean a couple of things. Here are some of them::

1. the throttle body valve has failed. this tube runs in an oil port down the manifold from the head, about 4" long.

2. worn valve stem seals or guides.

3. worn/cracked head gasket leaking water/antifreeze into the combustion chamber (causing steam)

4. turbo failure.. smokes at idle

5. cracked block. fissure inside cast block. change motor.

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Depending on the overall condition of the engine, it could have worn or frozen rings, worn valve guides or the turbo you installed is worn out. These are driven by exhaust pressure and if their bearings are worn, you may be getting a mix of compressed air from the turbo and oil that is seeping past the compressor's internal seals.

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It's likely that the bad bearings and resultant oil seepage from the bad turbo caused oil to pool up in the intercooler piping (this is common). With a new turbo in there, you won't have further oil seepage, so the remainder of the oil in the piping should burn off. Over the next little while, you should see the amount of smoke coming out continue to diminish. If it does not, and is still smoking in a week or two, post back up on here and we'll take it from there.

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