W123, Diesel Engine Repair

1985 300D, 123, 4 door sedan - only a little over 100.0 k on it. Thought I would change the engine mounts - owned old Mercedes diesels for over 35 years. This car is new to me - put about 8.0 k on it.

What is with the engine mounts! It has been tough to get the inside Allen bolt loose - I was finally able to get loose the one on the passenger side but the drivers side is driving me nuts - too close a tolerance with the bracket that holds the engine shock damper and is also the main weight bearing member that fastens to the engine mount.

bought a rough running 1982 300d turbo. Previous owner thought it was the injectors and replaced them with junkyard injectors and didn't use washers! I adjusted the valves as per Kent's instructions with his wrenches. I did a compression test - good compression in all cylinders. Installed MS rebuilt injectors and torqued to specs. Installed dampner bolt. Glow plugs work fine. Engine starts eaisly but runs very rough untill it warms up, then it runs great! I don't see any leaks of fuel. I am really stuck. I have an identical 300d that has run fine for the past 4 years!