BENZ AID - COMMON QUESTIONS AND ANSWERS

86 190D Injector knocking/nailing

I've got a non-turbo 190D, 1986, 255k, that was running well. I had some small leaks on the top of the injector pump, so I replaced the orings/seals. After reassembling it, I had a major Knock at just above idle to 1500 or so, and no power/more smoke, as well as an "up and down" idle. I then pulled all the injectors, cleaned them, pressure tested(all from 1600 to 1700), and put a new monark nozzle in #3.
This didn't solve anything, knock is still there, maybe slightly worse.
I've replaced both fuel filters. I've run diesel purge through the system, which does quiet it down. But it comes back when on the main system.
Any ideas where to go from here? Should I replace the knozzles? Could I have messed up the delivery valve seal setup(not sure how, but).

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300D Leaking Valve Cover Gasket

I have completed a valve adjustment and replaced the valve cover gasket. After running the car, oil can be seem around the edge of the gasket where it meets the engine block. The bolts are tight and I donot understand why there is a leak. The gasket was obtained from a OEM operation. Should I get a gasket from the dealer? Have other people experience this problem?

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1982 300D Mild engine shake and smoke exhaust at initial startup

I am having a 'rough idle' issue I cannot seem to resolve; I will categorize as mild because I have worked on a two 240D (1980, 1981) and I was able to perform the recommended maintenance to have them idle very smoothly.
Additionally, hard initial start or it quits right after initial startup, then I am getting a blue smoke from the exhaust at the initial startup and for about 10 minutes before complete warmup.

Here is what I have done up to this point using the manuals, advice, and parts from mercedessource:

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