One other possible symptom???

I have noticed that my 75 240D tends to knock quite a bit from idle to about 1500 rpms (guessing) at medium acceleration and then it smoothes out and sounds like a tight little motor.

Could this knock be a possible symptom that is related to the smoking problem? Is it possible someone moved the pump timing up a bit? I seem to remember that this would also create a knock if too advanced. But in the diesel world does this mean smoke and knock both? BTW - I tried the little sitting in the driveway injector test and coming opn and off the throttle does prduce smoke. Not clouds but enough that I felt a little silly smoking up the old neighborhood.

BTW - Just changed out the rear brake lines today as they were cracked and with the MityVac to bleed the brakes it was a piece of cake. Took me all of an hour to change the rear brake lines and bleed all four wheels. The globs of gunk (probably water molecules) that came out of the rear calipers was pretty scary.

Bill,
If you see this, I goofed and didn't take any photos while doing the work but I can easily shoot some shots and do a write up. Do you need this one or do you have this project covered?