Go by what the manual says, it has always worked for me, also if you have one the torque for to go with the manual is 6in-lbs. The manual specs are the same as cummins manual.

Hope that helps.

 

Adjusting valves and injectors on the same cylinders are for electronic engines, the way the manual directs you is correct.
smokincat is correct injectors are adjusted 6in-lbs.

 

If your CPL is 806, 821, 833, 903, or 904 then the proper injector torque is 105 inch pounds doing the outer base circle method. That is the only method I have ever used. and it works perfectly.
Injector first then the valves intake .014 and exhaust .027 Jake's at .018. If your CPL is 827, 910, 1185, 1210, 1211, 1256, 1280. then it is 90 inch pounds.
1374, 1380, 1395, and 1405 n14's none select engines are 125 inch pounds and the Jake is set to .023.
The sheet I have is from a Cummins course I took and is by far the best way. You need an inch pound torque wrench I have a Snap-on dial one if you have a click type just, go past the setting a couple of times and back it off being sure the lock nut is not interfering with the setting, then slowly bring it to the set torque.
Just a thought!

 

What about all the other cpl numbers, seems to be very specific. The other process can be done without a torque wrench which in my mind makes it simpler for the DIY person that hasn't invested in a in-lbs wrench.

 

The outer base circle method compensates for the wear on the injector drive components, and mainly it works. I have never found an engine in a truck that was not on the list. If it is call Cummins.
Also if you are going to do everything the same way, I think not. If it saves you money having the engine run right, buying a torque wrench is cheap.
Just a thought!

 

I like how you say that something that is in almost every 855 service manual is wrong, and that the engine won't run right if you do it that way. When you set an overhead, how does it not compensate for valve train wear, you are still setting it to specified number.

 

You are setting the injector to its exact contact pressure at the lowest point of it's travel. And with every injector set to the same value it does make a difference. They run a lot smother.
I have worked on lots of Cummins and have set them every way you can read about. It was Cummins that said this was the best way, the fastest way, the way you can do in areas that have restricted access. I will use the click stop torque wrench, on units like the old Volvo's that had three under the cab and an ignorant piece to get the dog house out.
They were the ones that said that setting the Jake's with a dial indicator was a lot more accurate. I have a small magnetic base cut to fit to do just the Jake's.
If you have the time try it the way the book says, and then the base circle method if you run the same wrought, you can judge it that way. I do not have a manual for the 855's but the base circle method was in most I have used.
If you believe your way is better, you have at it.

 

I have the update here from cummins saying to run the injectors on the outer base. The stc is best dont that way because the torquing of the set screw will take out for the wear of the tapet when setting the six in lbs will leave them lose some times. The inter base was the best thing for new guys so cummins tells you but there is more room for erorr in setting the inter base by getting on the wrong cyl.I will get some time this week end and look for the update. It gives you the torque specs on the paper also.Its too late tonight to look.How ever if you have some binding set screw threads like some rockers have the inter base will take that false reading in the torque out of the job.

 

Only reason Im am hestitant to set an injetor all the way bottomed out is that if you ever have an over rev situation the injectors dont fair so well.

Obviously not a problem on an engine with a normal rpm limit, but when you push them hard they can and will bottom out even on a loose setting.

The method I listed is from a factory service manual, guess the newer ones are updated.

 

Which ever way you set it inter base or outer base the plunger is masking on the cup very hard and by rights the two ways of setting should be same but with the setting top stops with the inter base the cam can be worn some and then you set it like the old manual say then the plunger to the cup can be left some what loser than the torque on the outer base. May not be any difference on a new engine but when it gets some miles on it the cam does wear some.

 

For a Pre-celect Cummins injector to inject the fuel it has to pressurize the fuel in the tip to do that it has fuel in the tip and the plunger comes down, pushing it out, very basic system.
Where I live we have mountains and the guys regularly take the motors to above 3000 on the Jake's. Never a problem. What you might want to try is set it up your way and put the timing mark on the mark and check the torque when it is all the way down.
Just a thought!
Like I said I have set them up every way you can think of and had many units come in that have been tuned by someone else, and the customer is not happy. I use to specialise in the 444 because I could get the most out of it, knew how to check it out and set the timing control and repair the system oil leaks.
You have a good day!