The_Josh_Bear
Full Access Member
...you might be able to cheat in the mean time and bend the thermal spring in the front of the clutch to cause the fan to come on sooner"
This was my first thought too to fix the engagement time. I've read that turning it 180* tighter will make it come on faster. (I think it's tighter that does it). Then do it again if it's too high still.
What is your EGTs running?
+1
I don't know if you did the 6.9 coolant mod, but I'm guessing not. The 7.3's will always run hotter than the same setup on a 6.9 because of anemic head cooling.
Boiling point for 50/50 coolant at sea level with a 15 psi cap is 265*F. At 250 I'd for sure be backing out of it because localized hot spots in the cylinder head will be well over that temp.
If you want to get scientific on it, measure the coolant temp at the lower radiator tank. Most have an npt petcock you can screw out and install a temp bung in it's place. That will tell you if the radiator/fan is functioning adequately. Check your gauge in a pot of boiling water too, I've seen them off as well.
+1 well said!