Seeking the several causes for white/gray smoke 83 240d - PeachParts Mercedes-Benz Forum

fochs · #1 12-26-2011, 06:49 PM

I have been trying to eliminate possible causes of white/gray smoke from my 83 240d. I set ip timing, valve adjustment, corrected chain elongation, reman injectors, all fuel hoses replaced, filters, purge, checked fuel hard lines to tank. The car has good compression and the smoke smells like diesel. There are no visable leaks in the system. It does have a loosened prechamber collar nut, but smoke did not go away when I cracked the line on that cylinder. I am leaning towards taking my car to a shop, but wonder if I am missing something which could be causing the smoke. I would like to limit shop time to my suspension. Is there anything that I am missing?
The car runs smooth and quiet, starts easily- temp in 30's F. Smoke begins to appear after glow plug cycle and volume of smoke builds after about one minute.

kerry · #2 12-26-2011, 07:58 PM

These kinds of questions are best asked using a YouTube video of the smoke so people can get a better sense of how much smoke is occurring.

Diesel911 · #3 12-26-2011, 08:16 PM

Still need more info.
Are you using only Diesel Fuel?
Was the Car Smoking like that when you bought it?
What do you consider good compression?
What is the temp range in the area the Car operates?

When my Volvo Diesel was putting out hazy gray Smoke; a little a idle and more when the Pedal was stepped on I took a chance that it was stuck Piston Rings and dumped Marvel Mystery Oil into the Cylinder; and it worked. Details of how to are in the DIY section.

In my Case my Car had sat not running for one year due to a leaking Seal on the Fuel Injection Pump. When I got it running it took me 6 months to realize I was driving with an Engine Thermostat that was opening too soak. Both, resulted in stuck Piston Rings.

fochs · #4 12-26-2011, 10:03 PM

Thanks, I am using straight diesel with power service additive. The car was not smoking when I purchased it, but the timing was off some. I think the PO got it running smooth just for me. I now know the power was low at the time of purchase, but hey. The compression is~350,350,375,350. The car operates at around 190 degrees F. The car starts up almost instantly after 1 glow cycle at less than 40 degrees F.
-I can do a video in a couple days.-
-Can an EGR cause this? It is something I have not checked.

whunter · #5 12-27-2011, 12:32 AM

Quote:

Originally Posted by fochs

Thanks, I am using straight diesel with power service additive. The car was not smoking when I purchased it, but the timing was off some. I think the PO got it running smooth just for me. I now know the power was low at the time of purchase, but hey. The compression is~350,350,375,350. The car operates at around 190 degrees F. The car starts up almost instantly after 1 glow cycle at less than 40 degrees F.
-I can do a video in a couple days.-
-Can an EGR cause this? It is something I have not checked.

If the excess smoke continues after the engine has reached operating temperature, taking into account everything you have done.

My best guess: The ADA (non turbo version of the ALDA) = altitude compensation valve is set too rich.
Be sure the ADA atmospheric vent port is NOT connected to vacuum...
You should only make adjustments in 1/4 turn increments.
* Turning the adjusting screw clock wise decreases fuel.
* Turning the adjusting screw counter clock wise increases fuel.

Your operating temperature should be around 176° F = 80° C.

If the EGR is still connected, put a BB in the vacuum line, and consider installing a galvanized plate between two gaskets = from the EGR to Intake manifold = instant blank off.

Read this thread
The higher temperature and smoke where cured by screwing in the ADA.
http://www.peachparts.com/shopforum/diesel-discussion/300512-overfueling-240d.html

Feel free to call me Tuesday.

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