In my experience, it usually takes 3 attempts at cranking for about 15 seconds. Once its started it may idle a little rough and that is due to air in the oil rails since it was all apart. It may also sound weird during cranking if the lifters were able to bleed down, not sure why this happens but i've had it once or twice. After cranking it, it should idle rough for maybe 8 seconds or so but then should smooth out. You may notice more smoke out of the exhaust during that time just due to coolant or anything residual that was in the intake, EGR cooler, or the cylinders themselves. Once it seems to be idling okay, check your fluids then go give it hell.
FORD: 2003-2005 Excursion
2003-2006 F-Super Duty
2004-2006 E-Series, F-650, F-750
Some 2003-2006 model year vehicles equipped with a 6.0L diesel engine may exhibit a crank time longer than 2.5 seconds in ambient temperatures above 32° F (0° C) and/or during hot restarts, or may exhibit a runs rough condition with no diagnostic trouble codes (DTCs). These conditions may be noticed at factory delivery or after a repair involving removal of high-pressure oil system components. This may be caused by air trapped in the high-pressure oil system.
To purge the air, drive the vehicle through at least 12 short, high-demand cycles, or until crank-time has improved (Example: 12 aggressive accelerations 25 MPH to 50 MPH (32 Km/h to 80 Km/h)). Turn off the engine for 5 minutes following the drive cycle, then restart the engine. If crank time remains above 2.5 seconds, perform normal hard start diagnostics per the PC/ED manual.
NOTE: A THREE TO FIVE (3-5) SECOND CRANK TIME MAY BE CONSIDERED NORMAL IN COLDER TEMPERATURES.
NOTE: IF THIS PROCEDURE IS NOT FOLLOWED, IT MAY TAKE MORE THAN 100 MILES OF NORMAL DRIVING TO REMOVE ALL OF THE TRAPPED AIR.
Last edited by DieselDano; 12-05-2009 at 04:38 AM.