Yes, I know, this topic has been done to death. But still...
What is the lowest temperature one can reasonably expect a 617 engine to start given new glow plugs and an average battery?
Dropped to 10 F. here yesterday. It would not start. Called road service. Guy showed up with a dinky booster battery pack, no jumper cables. Well, of course it would not start. It would barely turn over at all with that booster battery. Later in the day when it was slightly warmer, we called road service again and this time he showed up with jumper cables. Took about thirty seconds to start.
Seems to me cold weather is a double whammy for a diesel. Even if the battery is in good shape at low temperatures it just does not have the capacity it does when warmer. So cranking runs it down really fast. If you cycle the glow plugs several times you are depleting the battery so the heat from the plugs is canceled by inability to fast turn over, which is essential. A slow cranking engine just will not start, unlike a gasoline engine where a spark just might get it going even if it is cranking slowly.
So, below what temperature is starting a diesel in otherwise good shape problematical?