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Diesels make several hundred pounds of compression. It doesn't take too much of a leak to keep the cylinder from lighting off. The engine in the 802 will start pretty easily above freezing without preheat. Keep us posted on what you find.

I'd say the side that is black and oily isn't firing. If it were me I'd take off the rocker arms on that cylinder (exhaust first) then tap the top of the valve with a hammer. Put a wooden block on top of the valve and give it a sharp tap. You aren't trying to drive a spike so you don't need to...

That look like its running on one cylinder. I'd check to make sure your valves are closed.

If the engine is staying cold you may get a little black smoke. How much black smoke are you getting? A little haze or rollin' coal? A short video of the exhaust would be good. Black smoke with low power suggests an issue with airflow in or out of the engine. Before you rebuilt the engine did...