Good morning diesel friends,

Would like some input for diagnosing black smoke on acceleration.
Here is info on the beast that will help.

Older 617 Turbo, starts at 28F first time, no real stumbling, smoothes out pretty quickly with nice idle after 1 min even at cold start.

Good power on the road. Turbo boosts max to about 14 psi(yes i know it a little hi)

This engine sat for years at a salvage yard.

Head gasket, valve seals done in 2013

Ive put 4000 miles on it since head gasket and resurrection from salvage yard.

T3 Turbo is old one not rebuilt

Oil usage about a quart to 150 miles

Plenty of black smoke when you goose it!!

Very little smoke at idle.

CDR VALVE INSTALLED SEE DESCRIPTION BELOW

Crankcase Depression Regulator Valve or CDR Valve This valve is similar in function to a PCV valve in a gas engine. On a diesel, the CDR valve regulates the amount of pressure or blowby from the crankcase back to the intake thru the turbo.


Looks like not much left but:

turbo oil seal?

stuck oil rings?

or should I install stock oil separator instead of CDR?

What do you guys think??

If stuck rings any suggestions?

Thanks for your ideas

BigAl

I have not read of any 617.952 Engine that needs a CDR Valve; mine does not have one and you are the only one who has one on the Engine.

Concerning your smoke take a run get some smoke coming out of the Tail Pipe and pull over and smell it. If it smells like burnt Oil then it is Oil.

From your Oil consumption if you have no serious leaks I would say it is likely burning the Oil.

Where are you burning the Oil (in no specific order)?

The Oil in the Turbo Charger drains out by gravity anything like too much Oil in the Crankcase or a high Crankcase pressure will interfere with that and your Turbo will leak Oil. To me that means that the CDR Valve might cause that because it holds back Pressure.
Also on a Gasser the PVC Valve during part of the use to Vacuum. There is no Vacuum in the Diesel Manifold unless there is an Air Filter restriction.

Removing the Tubo Exhast near the Turbo will tell you if it is leaking Oil on the Turbine Side or from the Exhaust Manifold. When you look in side you will see shiny Carbon buildup; indicating an Oil leak. But that does not tell you if it is the Turbo for sure.

You need to pull off the Maifolds and inspect the Ports on the Head. If you see that shiny Carbon buildup in the Exhaust Ports it is the Valve Guides and or the Seals or the Oil is from the Piston Rings.

A plugged Air Filter can cause the Turbo to suck Oil out of the Compressor side.
The seal ring on the Compressor side of the Turbo could also be leaking Oil but if your Engine Blow-by is routed into the Turbo it is hard to tell. Better to see the Intake Manifold and if that is saturated with liquid Oil that is a good indication.

This last one just has to do with Oil consumption. No one has said it caused balck smoke. If the little O-ring that seals the Fuel Supply/Lift Pump is worn it can suck Oil out of the inside of the Fuel Injection Pump and that mixes with the Fuel and get injected into the Engine and burned as Fuel.

If the Black Smoke smells like Fuel you might want to turn down the Fuel on the ALDA.

If you pull an Injector and remove the Heat Shield and look inside of the Pre-chamber you should see a thin coat of flat black colored Carbon inside. If the Carbon is shiny you are burning Oil in the Combustion Chamber. That is different from Oil coming out of the Turbo on the Exhaust side and the Oil burning in the Exhaust system.

__________________
84 300D, 82 Volvo 244Gl Diesel

More possibilities than I would have thought!!
I will proceed to check them out! thanks

The CDR valve I added just recently to see if it might lower the oil consumption. It did not make any difference, so I will take it off.

Found a 240d type oil separator, and will install that instead, so any oil collected gets returned to crankcase.

Been systematically eliminating possibilities you mentioned

New air filter, just in case

Some minor oil leaks on engine, but nothing serious....frame and underside not coated with oil.

Inspected fuel filter, fuel very clear, not dark like engine oil was being mixed with it.

mercedes oil separator installed, removed cdr.

Next step is to pull exhaust off back of turbo, then intake man.

...........and see if it helps any.

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