Truck Repair: NH/NTC Injector Settings, torque settings, jam nut

Question
Hi Cliff,
Could you please tell me what is the injector torque settings for NH/NTC STC Big Cam Cummins  

Answer
What is the CPL because it makes a different on injector setting.
CPLs 821,833,903,904,& 806 are 105 INLBS
CPLs 910,827,1185,1188,1210,1211,1256,&1280 are 90 INLBS
CPLs 1374,1380,1395,1405,& 1507 are 125 INLBS
On the STC,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 torque to specs to bottom injector plunger.Then tighten the jam nut down.Adjust the Injector first,then the valves.
On STC it would be greatly advised to run injector flush through the fuel system for an hour to clean carbon off injector tips to prevent plugging spray holes causing a missfire.Cummins sells it in a metal can & you sill need a return & suction line to hook up to engine(one at fuel inlet & one on fuel return) and run it out of the can.