Burning oil

[Rawze]

(09-21-2016 )Pro Star Cummins Wrote:  Gentlemen and I use this term very lightly ( excusing Rawze ofcourse) .
We replaced turbo and actuator on ISX 871 about 2 weeks ago
With new from cummins dealer. We installed per watching Great video
Rawze provided. Our truck is now throwing smoke when first starting
Out,but can't see anything going down the road. We need to add oil
To top off stick after trip. Not overfilling crankcase.
Did we get bad turbo or did I install wrong, or is something not
Seating properly in turbo. We have pyro and boost gauges per
Rawze video. Any help is appreciated.

If it is oil loss, or oil related...

Sometimes reman turbos will have turbo slobber. I was told that they do not always replace face seals in them, but that is rumor. Turbo slobber can happen if there is a vacuum at the elbow joint between the turbo and the CAC unit. if it is a de-mandated truck, check for a vacuum by removing the joint clamp for the elbow at the turbo and lifting it up and down gently while the engine is idling. See if it has positive pressure like it should, or if it has a slight vacuum.

If it has a vacuum, adjust the turbo positioning at idle in the ECM up high enough to make a bit of positive pressure.

Do not rule out the possibility of valve guide seals. They are notorious for going bad on the newer CM2250 and CM2350 engines, but can also go bad on the older engines too.