Jim Warman Posted October 27, 2007 Share Posted October 27, 2007 Something I'm having trouble with convincing my young lions of.... turbochargers that "puke" oil. This was brought to a head yesterday when one of my diesel guys showed me a one month old EGR valve that was carbonned just about wide open.... (EGR from another store, thank God)... and I've been pushing coking deposit diagnosis this last while... Anyway, the new EGR goes in and the truck is running with the hot side CAC off.... Oil is dripping out of the turbo.... We've all seen CAC systems with oil in them - fact of life, right? So techs start to figure that oil in the system is normal and that's that.... But let's analyze a little (notice you can't spell analyze without "anal"?).... Where did the oil in the CAC system come from and how much are we seeing and (just as important) how much aren't we seeing. An easy check (and, for all I know, it may be mentioned in the new TSB) is to disconnect the hot side CAC AND the air intake duct. Clean out the turbocharger volute and run the truck. If the turbo starts puking oil, the seals are bad and this is up for replacement.... But some guys can't see the requirement for removing the intake duct.... but it has to be done to give meaning to the test. My point... most of what we do can be broken down in to simple ideas.... In this case, we are all used to seeing oil in the intake system.... but we have to wonder if the oil is coming from where it "normally" comes from. Or if it's oil that shouldn't be there.... Food for thought.... Quote Link to comment Share on other sites More sharing options...
Steve Mutter Posted October 27, 2007 Share Posted October 27, 2007 good point,if you had oil coming from the turbo with the cac off,would you then see smoke out the exhaust when everything is hooked back up,or would it all burn up in the cumbustion chamber if it was a small leak? I don't see much coking hear,most of the time it is just idle time and I have yet to see a turbo that is coked and not rusted Quote Link to comment Share on other sites More sharing options...
DwayneGorniak Posted October 28, 2007 Share Posted October 28, 2007 I have seen quite a few turbos over the years pukin oil myself. And no, they don't always smoke out the tailpipe. Quote Link to comment Share on other sites More sharing options...
Jim Warman Posted October 28, 2007 Author Share Posted October 28, 2007 Catalytic converters are very good at "desmoking" exhaust... used to be you could tell real quick if you had an oil burner on your hands but those days disappeared a long time ago. Anyone here know what a "road draft tube" is? /forums/images/%%GRAEMLIN_URL%%/grin.gif Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted October 28, 2007 Share Posted October 28, 2007 Anyone here know what a "road draft tube" is? Isn't that the slang term for a beer keg tap at tailgating parties? /forums/images/%%GRAEMLIN_URL%%/eeeesh.gif I think the Cat engines still had them up until a year or two ago. Keep in mind that re-opening the crankcase ventilation system is a mod for the 6.0L. I have read signatures and seen a few Webshots albums with the vent piped down the firewall and the intake plugged up. That will keep your charge air system clean for sure! Quote Link to comment Share on other sites More sharing options...
Jim Warman Posted October 28, 2007 Author Share Posted October 28, 2007 And that has to be some special sort of idiocy... the CCV mod".... "Yup, I'ma gonna let that sucker spew whatever out the side o' my truck so everyone can enjoy it... least the inside of my pipe'll be clean"... Apparently, none of these yokels thinks about what sort of pressure might be inside the crankcase whan boost hits one or two atmospheres (hmmm, now there would be an interesting tidbit of knowledge). Quote Link to comment Share on other sites More sharing options...
OHNO60 Posted October 29, 2007 Share Posted October 29, 2007 HAD 2 LAST WEEK. THE INTAKE WAS SO CAKED IT WAS IMPOSSIBLE TO CLEAN. SAME ISSUE. WEEK OLD EGR WEDGED OPEN WITH "CHUNK" BASICALLY BEEN CHANGING INTAKES AND TURBOS. Quote Link to comment Share on other sites More sharing options...
Mekanik Posted November 2, 2007 Share Posted November 2, 2007 I read about this happening on another site. They were saying that the egr would get stuck open agian because the carbon wasn't completley cleaned out of the intake. Nobody mentioned anything about the turbo. It makes total sense though. That is a good test and I'll remember it. Quote Link to comment Share on other sites More sharing options...
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