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Smoke from blow by tube

903 views 4 replies 2 participants last post by  5.9_mega 
#1 ·
Recently did an overhaul on my 5.9 Cummins. Everything went smoothly and had no problems assembling. Before dropping the pistons in I checked each ring gap and everything was perfectly in spec. Only put brand new parts into the engine... nothing was reused. Truck started right up on its first fire and for the 2 years I have owned this truck it’s never idled and revved so nicely. What would be causing the blow by smoke from the tube? If I take the cap off there is no air pressure whatsoever. Could it possibly be bad injectors? I’m also using sae 15w-40 non synthetic at the moment. Have about 500 miles now since the rebuild.
 
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