Dale W;
Have valve adjustments been checked, is the pump's number one been spill tested for injection timing, what diesel engine are you dealing with? A Nissan engine is always preheated before it's to be turned over. What is the cranking speed of the engine and do we have a load on it while it's cranking (HYD). A previous post asked about the exhaust smoke's color. Has the engine's head been worked on and what other repairs were dome on the power unit just before this issue started? I've seen a few strange reasons for a diesel not starting, and the one of the strangest one was a gas crank used in place of a diesel crank. The first step to take now is to determine what the cylinder combustion pressure readings are vs what they should be.