Posted by Notjustair on February 17, 2015 at 18:45:37 from (70.195.4.80):
I've got three JD tractors with the same engine (basically). An 8430, a 4440, and a 7800. The 8430 is obviously turned up in comparison, but the other two put out about the same horse power. What makes for an easy cold starting diesel engine? I know compression, but there has to be more. The 8430 has always needed to be plugged in if it is below 40 or forget it. The 4440 isn't quite that bad, but I wouldn't try it below 25 degrees. The 7800 will start no problem well below freezing. If I remember right, the book says you don't have to be concerned unless it is near zero. I plug it in anyway, but have needed it in a pinch and it fires right up.
The two older are mechanical pumps and the new one is gizmos galore. The 7800 has roughly 8000 hours and the 4440 has about 9000 hours - both on original engines. The 8430 has about 1500 hours on an out of frame rebuild. Is it the efficiency of the pump that makes the newer one easier to start? I would consider them all in top shape but have always wondered why that 8430 is so hateful when it is cold.
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