Quote:
Originally Posted by Biodiesel300TD
For a while now I've been getting intermittent smoking on my 78 240D. It can be pretty heavy sometimes, I've had people race around me to get out of the smoke, kind of embarrassing  . It's a bluish-black color. Seems like it's the smokiest on my afternoon/even commutes home, but not always, 15miles one way nearly all highway. This morning on the way in I'd get a tiny little puff on acceleration, pretty normal for an old diesel with 320k miles, but that's about it. I get a little smoke on start up but not much. I put new reman Bosch injectors in a couple years ago, though I've run around 20k miles of veg oil through them, and they started nailing a while back. Since removing the system the nailing has lessened but is still there, so I know I need to pull, clean, and pop test them. The intermittent thing has got me stumped. Engine temps are always reaching operating temps right about 90C. I've got plans to adjust the valves, which I do annually anyway, replace the diaphragm in the vac pump, and possibly doing the valve stem seals. I may also try the Marvel Mystery Oil trick in the cylinders while I have the injectors out. Any other thoughts or suggestions? |
The Bosch Injectors have some drilled passages in them that over time and no periodic Diesel Purges done on them can get entirely plugged. See #14 and #15 in the pic.
I think that using Veggie Oil would guarantee that they get Plugged.
Monark and Bosio Nozzles do not have the drilled passages.
Could it be the Valve Stem Seals are allowing Oil to get by the Valve Stems and into the Engine?
Valve Stem Seal Replace 617 Hunter speaks on how Bad Valve Guids/Seals can cause blow-by
http://www.peachparts.com/shopforum/showthread.php?t=203902&highlight=valve+seals
I do not know what year they changed from Pneumatic to Mechanical Governors on the Fuel Injection Pumps.
If you have a Pneumatic Governor a bad Diaphragm or Vacuum leak in the Housing can cause some issues. There has been some within the last week to 2 months threads on that.
The Marvel Mystery Oil will work only if the Rings are sticking due to Carbon Build up. People say using Synthetic Oil; after driving 200-300 miles will also free up sticking Rings.