Hello all, IM having trouble with a 5.9 cummins thats in a 2005 ford f650. The damn thing is burning oil very bad, smokes like a bbq out of control, anyone knows what this might be? Any help would be awsome, thanks!

 

What color is the smoke?

I'm going to move this one down to the large truck forum, this is a better place for this kind of issue. The Super Duty forum focuses on F250-F550 trucks.

 

Thanks crazy, anything would help!!!

 

Rings, turbo

If its the rings there should be blow-by. Remove the oil fill plug and check it there, normal will be very little pressure, abnormal would be maybe like 3-4 psi.

Turbo you will need to check intake and exhaust side. Pull each off. Intake could have a little residue but not large amounts. Any in the exhaust side is bad.

I suppose valve seals/guides could also be a problem.

 

I had all six rings replaced about 3 weeks ago, at the time there was pretty high blow by, this engine has a tube aiming downward on the driver side of the engine that the dealer says is the blow by tube, it ran good and strong before and after the ring job, all of a sudden it started burning oil again, could it be the rings again?

 

Well I would hope it wasn't, but things happen. Maybe a ring was broken and its just now showing.

You didn't say how much blow-by there is now.

Since this was just recently done, the exhaust should come off easily check it for oil at the turbo.

 

We replaced all three rings in all 6 cylinders, just in case, three of the sixes top rings were broken, the cylinder walls were good not scuffed or scored, the blow by now is not as bad as before, but the oil burning is significantly more, now on the turbo, which tube is which? There is one big tube that comes off the air cleaner, and another that comes off the egr system, and one that connects to the exhaust pipe. Could a bad injector o-ring be the cause of this?

 

I would pull the intake (from air cleaner) first, then the exhaust pipe second.

Cant give you an answer for the injector seals other than this, The injectors I see do not have oil around them.

 

Who did the work?

My wag is that cylinders were torn up enough to ruin the new oil rings.

3 rings? Not 4?

 

If the compression rings were broken, then the piston ring lands were worn excessively (too much side clearance) and they should have been replaced.

If there was any bore damage the engine should have been overbored (or bored and sleeved).

The Cummins B is considered a throw away engine in class 6-7 trucks.

A sleeved engine like the Navistar DT466 is preferred.

Sounds like you need a new mechanic.

 

Sorry OT but I read your name as HENRYTHEWOMAN at first

 

IS THIS A CUMMINS B?

 

The cummins 5.9 is a B series, same base engine as in the Ram pickup.

The displacement has been increased to 6.7 l for the newer trucks.

 

I'd remove the turbo, plug the oil line going to it and fire the engine up to see if that fixes its oil burning.
This would be the best test for the turbo and its seals.