Just quick question. Ive never heard of anyone running the overhead on our CTD's. I know on big trucks youre supposed to set the valves every couple 100K miles. I know that there are alot of this dodges with 200, 300, 400K miles on them out there. Is it ever necessary to run the overhead on these cummins motors, (5.9 or 6.7) ???

 

I think Dodge book says initial at 100k and every 150k after that. Cummins I think just says every 150k.

 

150 in most cases or when you replace injectors.