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940 white smoke
my exhaust randomly putting out white smoke. It is cold out side but I thought that was supposed to stop after warming up. It seems to only happen while idling. |
a little white steam is normal in cold weather, gasoline is a hydrocarbon, and when you burn hydrogen and carbon with oxygen, you get CO2 and H2O ...
massive big clouds of pure white can indicate a head gasket failure, but when that happens you'll usuallly have smoke bubbling out of the coolant overfflow bottle, along with oil slick rainbows... clouds of light BLUE smoke generally indicate burning oil. |
Thank you
Thank you for the reply. I finally located a source of leaking of oil coming from the bottom of my turbo it seems. There is a nut missing where there is supposed to be 2 there’s only one still and pretty good dose of oil is around the turbo. Hopefully this just means it’s not got a good deal around the turbo and not something more sinister.
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oh yeah, turbos are another source of oil and/or water in the exhaust... they have both oil and water plumbed through them for lubrication and cooling. the turbine inside spins at an insanely high speed, like 100,000 RPM or something, so the seals on the bearing shaft is pretty fragile. they can also spray oil into the engine intake, whereupon the engine turns a very small amount of oil into lotsa smoke.
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Originally Posted by pierce
(Post 469369)
oh yeah, turbos are another source of oil and/or water in the exhaust... they have both oil and water plumbed through them for lubrication and cooling. the turbine inside spins at an insanely high speed, like 100,000 RPM or something, so the seals on the bearing shaft is pretty fragile. they can also spray oil into the engine intake, whereupon the engine turns a very small amount of oil into lotsa smoke.
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you mean the nut on the banjo fitting? if those were missing, the oil would be pouring out the opening. and no oil pressure in turbo, it self destructs the first time you wind it up.
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Not sure
Not sure what you mean by banjo fitting but it’s the line the comes from the oil pan to the turbo and it’s the two nuts on the turbo itself. Only one is missing and it’s a pretty descent leak but not enough to show much of a spot on the ground. It’s very light leak. |
oh, that one is the oil drain, low pressure oil out of the turbo back into the engine oil pan. my 740T had a drip for awhile which was tracked down to a missing seal where that downpipe sticks into the block. There's a banjo fitting on the pressurized oil input line (and I think on thee two coolant lines). here, this is a fancy braided oil line, with a banjo fitting on top... I believe the stock oil line is a thinner pipe, but it too has a banjo...
https://cimg2.ibsrv.net/gimg/volvofo...bbab43485e.jpg |
Originally Posted by pierce
(Post 469378)
oh, that one is the oil drain, low pressure oil out of the turbo back into the engine oil pan. my 740T had a drip for awhile which was tracked down to a missing seal where that downpipe sticks into the block. There's a banjo fitting on the pressurized oil input line (and I think on thee two coolant lines). here, this is a fancy braided oil line, with a banjo fitting on top... I believe the stock oil line is a thinner pipe, but it too has a banjo...
https://cimg2.ibsrv.net/gimg/volvofo...bbab43485e.jpg alright sweet. So if it’s just the oil return seal leaking due to a missing nut I should be okay until I can get it to the shop right? I know it could probably get ugly if that other nut backs out. |
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