I had a 617-952 engine several years ago that I wanted to run before I sold. I adjusted the valves, which I knew it needed, hooked up some fuel, bolted on the starter, warmed up 4 of the 5 glow plugs, and off it went. It didn't even have a vacuum pump on it. I connected the cooler lines together with a piece of clear tubing and a couple of clamps. I sold it to another forum member.