Diesel Engine Specific Aid

hello out there. I'm trying to troubleshoot a smoke problems with my 1973 220d. The main problem is that I don't know what to expect from these cars. After installing the updated glow plug system, one rocker arm/shaft assembly, and removing the injectors to check them out, the car runs great and steady. At idle, the smoke is not bad at all, but if I goose the throttle, black smoke billows. It puffs smoke pretty good when accelerating and under load. From what I have read, this could be the vacuum pump or fi pump diaphragm. I had the back off of the pump and the diaphragm "looked" good.

I have 76 300D that makes a thumping noise that I was certain was the exhaust pipe hitting the chassis/frame. I know this noise and was very surprised to find the exhaust pipe was tight and not the source of the noise. It is related to engine shake at idle. The car starts/runs great but has always had a rough idle. It only makes the noise when the car is stopped in drive. The car will stop making the noise if I shift to neutral. I think there is more to it than the change in rpm caused by putting it in neutral.

I have an 82 240D with >217,000 mi. This summer it started not wanting to start once it reached operating temperature. It seems like it is getting air in the lines, but if you let it cool down then it will start again. I replaced the flex fuel line from the tank and the one under the hood on the suction side. I then bought why my diesel will not start, lots of info, nothing specific to hot starting problems. I have since put in a used tubo starter and a new timing chain. The engine turns over faster and has more pep but still refuses to start when warm.

I recently replaced my air cleaner bracket which required disconnecting and reconnecting the oil line from the top of the turbo. After reassembling everything, the turbocharger leaked oil. There's a paper gasket where the oil line meets the turbo, and I didn't know I'd have to replace it if I ever disconnect the oil line. I got a new one from a local M-B dealer, partnumber A 603 187 05 80, but it's the wrong size. I tried to use the gasket anyway by making cuts in the gasket, but I doubt it is sealed well or will last very long.