oil in exhaust pipe

S

steveo24

New member
Joined
Apr 21, 2009
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59
Ok, so, I just got the truck back together a month ago, and I am having a problem thaty has got me stumped. I blew a head gasket, so I had the head milled and re-installed it with ARP 425's and torqued them down to 130 ft lbs. I put a stock replacement head gasket in from Cummins and paid the machine shop that milled the head to install new valve seals, and tank the head while it was apart. WHile I had it apart, I installed a new super b special turbo and kept the 150 sticks in there. I drove it for a month and all of a sudden one day, I had some blueish smoke coming out the stacks. After further investigation, I had what looked to be straight motor oil dripping out of the pipe under the truck. I pulled the turbo and the manifold back off, and to my suprise no oil whatsoever. I figured this would determine whether or not the head gasket failed again, or if the new turbo blew a seal?? Nothing in either except the normal amount of soot. I am stumped here guys, is there something I am missing. The oil and coolant are not mixing in either the crankcase or the radiator?? Any help is appreciated, thanks
 
turbojoe said:
prolly the turbo then if the head and manifold are dry.

Joe
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That is just the thing- the back end of the turbocharger looks as dry as the rest? Now I know at temps like 7-800 degrees it shouldn't take long to cook of some stray oil, but it all looked the same. I also forgot to mention that it always doesn't do it, sometimes there is no smoke and no haze from the pipes, sometimes it's horrible
 
if so, i had to put a slight bend in it to get it to clear the wastegate on the super b special, i did not kink it by any means, but possibly hooked up the hose connection at the bottom wrong, or kinked down there, I will have to give that a look.
 
old post i know, but i had oil pouring out of my exhaust, so i thought, it turned out to be fuel and is was cleaning the soot from the exhaust and turning it black. I couldnt start the truck and while cranking for a while , and thinking it was oil, i replaced the bad in j. and all was good. Maybe this is totally off or wrong info for your problem, but i thought that your story sounded like mine. good luck.
 
mikeshauling said:
old post i know, but i had oil pouring out of my exhaust, so i thought, it turned out to be fuel and is was cleaning the soot from the exhaust and turning it black. I couldnt start the truck and while cranking for a while , and thinking it was oil, i replaced the bad in j. and all was good. Maybe this is totally off or wrong info for your problem, but i thought that your story sounded like mine. good luck.
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I remember reading about that in a thread on another forum. Funny thing is that it has stopped, so I am not worrying about it for a while, thanks for the replies guys
 
this is what I found when I had oil pouring from the exhaust....

piston2.jpg


the only other place in your exhaust it could be coming from would be a blow exhaust seal in the turbo
 
There is a possibility it could be your exhaust seals on the valve stems. Sometimes they will slide up and allow engine oil to run down into the exhaust. At an idle the oil will drip into your exhaust, but at higher rpm under load it will burn off the mani and turbo leaving it in the pipe to burn (blue smoke) or drip. This is more common with engines that see more than factory rpm.
 
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