Truck Repair: cummis timing marks, drive pulley, screw out

Question
I have replaced #3 injector now I need to set the valves and Jake. To my understanding there are marks on the accessory drive pulley, but I was only able to find one because of the rust and damage done to the pulley over the years.The one I found has cler letter "a"on it.

Answer
On the Celect,you adjust valves & inj on same cyl.The mark A is now 1-6,B is 2-5, & C is 3-4.Valves are Int 0.014 & Exhaust is 0.027.The injector you hand tighten screw until injector plunger bottoms out.Back screw out 2 flats,ie turn corner of lock nut to align with the riviot in the rocker lever(pushtube side),then back out screw two "corners" then tighten the jam nut down.Adjust the Injector first,then the valves.