3.18.2016
Alright then .
After a long day at work I went home and got right to it , here's the scoop , shoop :
Pic. # 1 is the used set of delivery valves and parts I scavenged from a 1980 W-116 , the pie pan I used to soak and clean them in alcohol , they're all nice and squeaky clean and wire brushed etc.
Pic. # 2 is the old delivery valves I removed from my 1984 300CD , in the order and position I removed them in ~ notice that two of the ring parts had been installed upside-down by some one.... not me , I wonder whom .
The one on the far left you can see the dull finish of corrosion ~ it's not dirty , this is after I spent some time wire brushing it , why I decided to yank them all out to - night .
I removed all the fuel pipes and set them aside then removed one delivery valve at a time , peered in the open IP hole , cleaned it up and installed the new (used 1981) valves and pintles .
Here's what I found :
# 1 was clean as I'd taken it apart yesterday , only a tiny bit of crud on the bottom of the ring part .
# 2 had A WATER DROPLET (YIKES !) on the bottom of the ring part as well as fine dirt and some opaque stuff (liquid) in the bottom of the open IP hole , no woder this poor thing smoked and couldn't be properly timed .
# 3 had lots of crud and grey colored liquid in the IP hole mixed with the Diesel fuel .
# 4 had RUSTY GUNK (more yikes !) all over the delivery valve , the pintle and in the bottom of the IP hole too .
# 5 had more opaque stuff and fine dirt on the bottom of the ring part and in the IP hole .
ALL the pintles (they're fluted , not sure if you can see this in my crappy photo) had lots of mostly fine crud in their flutes .
I used Ether (starting fluid) with a plastic snorkel to blow the crud and water etc. out of each open IP hole as I went along , trying hard to maintain as clean as i can get inside the injection system .
I tried to remove the copper sealing ring with my dental pick but it's jammed in there pretty tight .
I didn't see any copper in the # 5 hole , either it has a mild steel , alloy or (worse) NO sealing ring but it hadn't been leaking so I took a chance and buttoned it all back up after cleaning everything and replacing the valves .
Interestingly , the valves I took out , the ring part (# 6) anyway , are shaped differently than the one in picture # 3 and the ones from the 1981 W116 too .
Because I spotted water droplets and water almost *instantly* blows out injector tips , I dumped a quart of alcohol in the fuel tank , I have about 1/3 a tank full right now and I plan to drive it dry or as close to that as I can .
Leaving fr a spirited test drive at various loads and speeds , I'm quite sure it's smoking _far_ less , it idles slower , 600 RPM , used to be 750 and I changed nothing apart from the old crappy , rusty , dirty , mis assembled delivery valves .
It also runs noticeably smoother now , I'll wait until I've gone through another tank of fuel before I trust this as there may well be more crud / rust in the tank that'll come loose with the alcohol .
Whew .
I feel like I've been polishing a turd for the last few years here but the truth is : I REALLY like driving this car ! 
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-Nate
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