Cummins NTC 444 proper overhead procedure

I like the OBC method. Always make sure there is no oil pressure in the system.

 

Certain cpl's set the injectors at 105 in/lb. That always felt too tight so we used 90. The valves
are set at .014 &.027. The .011 & .023 specs are used when setting up inner base. Pay attention
to the plastic oil jumper tubes that sit below the injector. The plugs can blow out & cause an
oil leak & the injectors won't go to advanced time. If they're original i'd replace them.

 

If I remember correctly there are seven moving part stacked in the injector.
As the injectors wear the injector travel gets to be less. The outer base
circle method was meant to address that, as using the inner base circle
method on worn injectors camshaft and injector train would be overloaded.
With new injectors both methods will work fine.