Oil consumption : how to reduce it?

[tanman_2006]

I use Lucas in my 93 and case IH with 8.3 cummins. Im sold. They both have bad rear mains and blow by. Rear mains still seep but oil consumption in the tractor went from a gallon ever 12hr day to a gallon every 30 or so hrs and visual blow by reduction.

My truck uses a qt every 500 miles but is almost only used to tow. It was using a qt every 200 before.

 

[matuva]

Finally, the GM-8 wasn't the culprit: the 2nd one doesn't cure white smoke, and i still get oil leaking from outside the turbo elbow and along the downpipe.:mad2::mad2::mad2:

At least I'm very bad luck, and the 2nd turbo blew out too, but I don't think so. I believe it is oil coming from the exhaust...

Doesn't seem to be oil coming from combustion chamber, it smells "hot oil" rather than "burnt oil".

The mechanic thinks it is coming from worn or broken piston ring, I rather think it comes from somewhere from the head...

Any opinion?

 

[buddy]

So you have oil that you are burning and an oil leak. Is it dripping onto the downpipe or where do you see oil in the engine bay? Have you take the upper intake off to see if its covered in oil?

 

[tanman_2006]

If the rings were that bad i would think you could tell from performance and the miss and blow by huff out the fill tube...

I vote EGR, HG, or odd crack in the head

 

[bison]

Finally, the GM-8 wasn't the culprit: the 2nd one doesn't cure white smoke, and i still get oil leaking from outside the turbo elbow and along the downpipe.:mad2::mad2::mad2:

At least I'm very bad luck, and the 2nd turbo blew out too, but I don't think so. I believe it is oil coming from the exhaust...

Doesn't seem to be oil coming from combustion chamber, it smells "hot oil" rather than "burnt oil".

The mechanic thinks it is coming from worn or broken piston ring, I rather think it comes from somewhere from the head...

Any opinion?

For the blowby(piston rings), do a compression test.
A tubo'd engine usually doesn't burn oil trough bad rings cause of the boost pressure blowing oil down along the pistons.

The oil on the Turbo elbow and down pipe can be coming from a faulty valve cover gasket or turbo oil supply hose/fitting.
Secondly, the turbo could have a leaking exhaust vane seal ring,you need to take the turbo apart to find it.

Did you test the injectors?

 

[matuva]

Here is how it looks. Sorry, no good pictures as I have lost my camera and
did them with my phone.

 

[matuva]

Yes Simon, injectors are OK.

This second turbo was taken from a running engine, after the owner swap to the ATT. It was working trouble free, and now it does leak oil, same as did the previous one.

Oil is leaking at the back of turbo, and I get white smoke at exhaust. Just a haze at iddle or cruising, but a large cloud at taking off from a stop, then a significant amount i can easely see in mirrors during acceleration.

I'm suspecting the positive stem seals of exhaust valves...

 

[buddy]

I was thinking valves as well, if the oil is actually inside the exhaust. Thats what I wasnt sure I understood right, that the oil is inside the downpipe.

 

[bison]

That fresh looking oil at the wastegate arm suggests a faulty turbo seal,sure a lot of oil coming trough by the looks of it
.
Slobbering oil trough the exhaust valve seals is possible but the exhaust pressure tends to blow exh gasses past the valve stems into the crank case instead of sucking oil in.
Boost pressure does the same on the intake valves,keeps the oil from entering the combustion chamber.

I would do a compression test to find out if the valves and/or rings have an issue

 

[buddy]

I might think some valve seals or cracked head could be leaking behind the closed valve, perhaps pushed by excessive crankcase pressure from poor ring seal during compression and combustion strokes, and then pushed out the exhaust when it opens the valve.

 

[matuva]

Guy's, I'm lost, completely :???:

about a week ago, I found my turbo was shot and diagnose it was the culprit for my oil consumption.

The turbo was leaking oil a lot at the exhaust elbow, at the connection to the downpipe too and oil is generously spread on the downpipe and the frame.

So i changed it and put a "used but good" GM8. This GM-8 was working flawelessly on the truck from which it was taken out.
It was replaced by an ATT as an upgrade.

Smoke was gone, no more...

Few days ago, I again noticed white smoke at exhaust during acceleration, and things get worse and worse.
Now I can clearly see smoke even at iddle, and, taking of from a red light or a stop, I don't even accelerate for fear of being ridiculous as she smokes a lot :mad2:

I had so the project of rebuilding a 141, thinking something is wrong inside my 599.

Then, I think about (yes, I do sometimes....) and remark that on the old turbo, the exhaust side of the turbine (turbine gas outlet) is oily a lot, and the side where the exhaust connect is dry (turbine exhaust gas inlet), sooty but dry.
So, that does confirm that nothing is wrong inside the engine, as no oil at all is seen at the exhaust manifold.

On the second turbo, that is exactely the same....

So, I think I might be on the wrong path by deciding to rebuild an engine, as this one is probably OK.

But, what can kill 2 turbos in less a month?:???::???:

There's really something I don't understand

 

[nobby]

Blocked Return line, something preventing the turbo from draining the oil.

Cheers
Nobby

 

[matuva]

Blocked Return line, something preventing the turbo from draining the oil.

Cheers
Nobby

mmmm, worth a try, this is something I didn't think about... I will check

 

[tanman_2006]

Blocked Return line, something preventing the turbo from draining the oil.

Cheers
Nobby

x2, im no expert but if the oil doesnt have anywhere to go it would leave through the path of least resistance. I'm not sure I have ever heard of a return oil line plugging but i guess it could happen.

 

[bison]

Take the old turbo apart and have a look see at the exhaust seal ring,it could be broke or stuck on the shaft and spun in the housing.
The seal ring on the second turbo could've gotten stuck from dried up soot just by sitting to long on the shelf and broke shortly after you started using it again,or it was about to fail anyway....How is shaft play on both turbo's?
I can't see the drain being plugged,..its a pretty big tube.

 

[matuva]

Well, digging deeper in the garage, we found a GM-4.

Installed it on the Blazer, and no more smoke... we'll see in the days coming how it goes.

The positive point is that the turbine exhaust gas inlet is dry.

So definitely, the engine is OK.

 

[matuva]

Little update.

No more smoke with this GM-4, but geeez, this thing is slow now

I didn't suspect so much difference between GM-4 and GM-8

 

[ak diesel driver]

att time?

 

[matuva]

I would have love it ak :dunno:

But, due to high expenses coming for my daughter willing to study at Auckland university (New Zealand), I have to make choices....

 

[buddy]

What is slow, the truck or the turbo? Maybe you need to flip the chip to a different setting.