Truck Repair: Cummins, compression release, firing order

Question
Hi Cliff
Thank you so much for all of your valuable advice!! I am a mechanic.. Does anyone offer Cummins Tech. manuals on CD's?
On running the overhead, could you make it more clear for me. I am working on a old compression release N series 855 with Pressure Timed fuel system. The injectors plunger & spring come up above the injector cup. I need a more thorough explanation on running the overhead. When turning the accessory drive to C , does it matter where Top dead center was? Can you just start anywhere as long as you just start with C? Then you do the injector first & then the one valve? Then rotate to whatever is next A or B? I am sorry, for sounding ignorant, but it has been a while, and I can not remember.. I have all of the right tools, except service manuals. Is their any other forums on the web for mechanics? Thank you for your time.

Jason

Answer
It doesn't matter which letter you start with,just go in firing order.Both valves will be closed on the correct cyl to adjust.Firing order:1-5-3-6-2-4
   Letter        Valves               Inj
     A             2                   4
     B             4                   1
     C             1                   5
     A             5                   3
     B             3                   6
     C             6                   2

 Intake 0.016        Exhaust 0.029         Inj 55-60 inlbs