2004 duamax

[ffemtwoody]

this morning when it got to operation temp it started to blow smoke out of the crank case breather tube. when it cools down no smoke. only at operating temp
the smoke has a fuel smell to it
where should i start

 

[McRat]

LB7 or LLY?

 

[BlkMax]

Check the oil. Is it too full? Does it smell like diesel?

Do a paper towel test. Wipe the dipstick with a clean paper towel. Is there a darkening outside of the place where the oil marks the towel? If there is diesel in the oil it will wick out of the oil into the area surrounding the oil.

If it is an LB7, you may have an injector issue.

 

[ffemtwoody]

its a LB7 engine I had injectors replace about 25000 miles ago

 

[McRat]

Blowby is always going to smell like diesel. Just like a gas engine smells of gas.

But if there is a lot of diesel fuel in your oil, it most likely got there via your injectors.

If your oil level goes up, you've got a problem.

This does not apply to LLY+, as the injectors are on the outside of the crankcase system.

 

[McRat]

However, if your oil looks like gray peanut butter, you've got water in your oil.

 

[ffemtwoody]

just checked the oil their is no smell of fuel and it does not wick on a paper towel

 

[ffemtwoody]

the oil level is normal and no milky color or smell of fuel

 

[ffemtwoody]

any other thoughts or suggestions

 

[ffemtwoody]

has anyone ever heard of this. It just started this morning and all gauges are normal fluid levels are normal

 

[dieseldave01]

you may have better luck posting this question in a more appropiate section, but welcome