I regularly see this problem posted in forums. I have this engine and hard starting was a real problem. I was told that problem was that the engine was old. I totally rebuilt the engine putting in new pistons, cylinders, bearing, injectors none of which improved the hard-starting problem. Finally I incorporated 2 glow plugs into the injectors and my engine now starts immediately even in cold weather. Adding the glow plugs is a bit tricky but I have worked out all the details and have all the necessary equipment needed in my machine shop. If your engine is suffering from cold starts and you're interested in fixing it you can call me at 714=305-2135. I don't need the entire engine, only the injector. It is fairly simple to extract and re-install and I can talk you through the details.