I have an 05 NXS twin turbo c15 that has about 935k kms. Truck had blowby when I bought it, and slowly it’s been omitting more and more blue smoke. I can really notice it pouring out when under load in soft ground, goes through a bit of oil but not an insane amount.
Talked to a mechanic that is going to do the work for me and he figured it was an over fueling injector, or injector o rings. Is this a safe assessment or could it be piston rings.
Cat C15 blue smoke and blowby
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Vipercat, Dec 13, 2019.
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Is the blue smoke coming out of the exhaust or the crankcase breather tube?
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blue smoke is coming from the exhaust aswell as underneath the truck, but there’s a few exhaust leaks so I figured it was from there. The blue smoke is not constant, but is getting much more prevalent and thicker. -
We have two at work 2006 C15 one with little over a million other with 950,000 miles on them.
Have not been rebuilt, heads have not been off. Injectors have been replaced on both trucks.
These are very good engines. I would probably check on getting injectors replaced and see what happens. -
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Blue smoke typically means burning oil. Over-fueling is black/grey. If blowby has gotten worse at the same time the blue smoke started, I'd say you've got an oil consumption issue.
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NXS
general rule of thumb. if its puffing, especially from cold start up, you have an issue. if its just a constant haze once running and at operating temp, there is no serious issue.
if you do rebuild though I would strongly recommend fitting 16:1 comp pistons, ever as a standard ACERT -
The main concern now is the blue smoke from exhaust. It doesn’t all the time but under load it gets pretty heavy between O rings and injectors. It seems blue smoke indicates an oil issue. I’ll definitely look into that 16:1 if I rebuild, thanks for the reply! -
ACERTS aren't the best for oil consumption and blue smoke.
I personally use the late SDP prefix rings with the 164xxxx middle ring on 16:1 IPD pistons and don't have issues.baha Thanks this.
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