Your pictures show a Neuss built engine, D-179 which is referred to as the German diesel. IH had many, many service bulletins out about that eye burning stinking engine. One guy even claimed his cows got sick when he used that style engine in the barn and was taking IH to task over it. So, what they did was made a higher compression piston and changed the injection nozzles to low sac nozzle tip. The nozzle made for less dribble after injection and the compression ratio raised the cyl temp for more complete combustion under light or no load conditions. You cannot lean out a diesel as you do a gasoline engine BECAUSE the amount of fuel you inject is what controls the speed of the engine. When you make adjustments to the pump like giving it more or less fuel you are adjusting the limits of how much fuel it can deliver. In other words, adjusting a stop for maximum movement. Timing of injection effects smoke and running but more than likely your problem is lack of heat, and I don't mean coolant temp, I mean combustion temperatures. Put it to work, and then see what you have.
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Today's Featured Article - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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