smoking issue

[Xplicit Racing Design]

well here it goes, when my truck is all warmed up it starts smoking like an old whore, not at all when its under 160 degree's , lots of blue smoke and it reaks of burnt oil, everything is new, motor was 100% freshened, and the turbo is brand new, before i go tearing into this thing for the billionth time, anyone have any simple suggestions? the plugs have not even a hint of oil on them, when i had the turbo off it had a small small bit of oil residue on the compressor and discharge side, but every turbo i have seen has a little bit


thanks John S

 

[TurboTony]

What size is your oil drain? Anything under 10 an or so will cause that concern. I know from experience.

Make sure there are NO restrictions in that line.

Tony

 

[Xplicit Racing Design]

yes its a 10, its comes out 45 and then i used a full flow 90 into the pan, getting rid of the factory forged 90 and i welded a steel female AN to the pan, im thinking tomorrow i might pull the turbo off and run the truck with the oil feed blocked, see what happens, if the smoking stops i can eliminate motor issue's


thanks
John S

 

[myclone]

FYI, if the prob shows up at idle you can just block the turbo oil feed and wait for the temp to come up and see if the smoke is still there. Thatd save pulling the turbo all the way off. Just a thought....

My money is on a leaking turbo seal.

 

[TurboTony]

I ran into this same problem the first year I had my truck together.

I was thinking it was a seal at the time too. After talking to a turbo shop they told me to make absolutley sure that the whole drain line was 1/2. Turned out the fitting I welded to the pan was a 10, but the internal hole was only around 3/8.

From what the turbo guy told me the turbine side of the turbo doesn't have a seal. I has something similar to a compression ring that only prevents exhaust from going into the oil, not the other way around. The turbo relies on the oil level being lower than the shaft to keep oil out of the turbine side. So if the drain backs up you will run into this. I drilled out thefitting and the problem was solved.

Tony

 

[canadian]

any possibility that you're sucking oil into the intake through pcv's?

 

[Xplicit Racing Design]

thanks for the info guys, ill measure the fitting i welded on the pan and go from there, gonna suck if i have to pull the pan off but oh well

oh and Myclone i got the rest of the funds so ill be shipping everything out today if possible or the latest tuesday cause of the holiday



John S

 

[Xplicit Racing Design]

alright well here is where the plot thickens, i pulled the return off and measured the fitting into the pan and it was 1/2 inch, and i stuck a piece of tig wire in the hole to make sure there wasnt anything blocking it, everything seemed fine, i pulled the center cartridge off and left the exhaust housing on, ran the truck and there was NO smoke, i did notice that there was some slight slight white smoke coming out of the oil return line, meaning looked like there was some blow by escaping from the crankcase up the line since it was still attached the pan, i dont know how much is normal, this might just be me being over cautious, what i did find is the inside of the compressor housing is FULL of gunk, reminds me of grease, its all over the inside of the housing, when i initially had the truck running, i was using a #6 for the feed, im wondering if this being too big might of blown out the seal, but what i dont understand is the inside of the intercooler tubing is pretty much clean, is it possible for the air to carry the oil into the motor to be burned? doesnt sound possible to me, but who knows, there was hardly any oil on the exhaust side



John S

 

[canadian]

any possibility that you're sucking oil into the intake through pcv's?

 

[Xplicit Racing Design]

all i have is a breather on the truck, no PCV

thanks for your thoughts


John S