NTC 400 Big Cam 3 Overhead - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 12 (permalink) Old 09-13-2011, 05:01 AM Thread Starter
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NTC 400 Big Cam 3 Overhead

Hey i got my engine all put together and running and tommarrow im going to recheck my valve adjustments. My tag says .11 and .23. I have read different ways on the internet and they all have many opnions on it. I set it up according to the cummins service manual.

Ive read online with "This will be cold or 4 hours after running.

You adjust valves & inj on same cyl.The mark A is 1-6, B is 2-5, & C is 3-4.Valves are Int 0.014 & Exhaust is 0.027.The injector you tighten screw until injector plunger bottoms out to 105 in lbs.Adjust the injector first,then the valves.Jake brake setting is 0.018 if it has them"

The manual I have says a totally different way it says

Bar in Pulley Cyl. Set Cylinder
Direction Position Firing Injector Valve
Start A 1 3 5
Advance to B 5 6 3
Advance to C 3 2 6
Advance to A 6 4 2
Advance to B 2 1 4
Advance to C 4 5 1


Im just looking for insight on what works best also the correct injector settings ive seen zero lash then 105in lbs? Also Id like to be able to run through these with the engine warm if possible.

Looking for insight from the diesel garage community!
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post #2 of 12 (permalink) Old 09-13-2011, 11:15 AM
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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.

Cody.

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post #3 of 12 (permalink) Old 09-13-2011, 11:03 PM
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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.
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post #4 of 12 (permalink) Old 09-13-2011, 11:21 PM
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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!

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post #5 of 12 (permalink) Old 09-14-2011, 02:15 PM
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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.

Cody.

79 KW W900A 3406B, Garrett GT55 turbo, RTO12513,
4.11 SQHP rockwells

79 KW K100C 400BC1, Holset HT4B hybrid, custom
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post #6 of 12 (permalink) Old 09-14-2011, 04:58 PM
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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!

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post #7 of 12 (permalink) Old 09-14-2011, 10:47 PM
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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.

Cody.

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79 KW K100C 400BC1, Holset HT4B hybrid, custom
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post #8 of 12 (permalink) Old 09-15-2011, 02:40 AM
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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.

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post #9 of 12 (permalink) Old 09-15-2011, 03:17 AM
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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.
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post #10 of 12 (permalink) Old 09-15-2011, 11:36 AM
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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.

Cody.

79 KW W900A 3406B, Garrett GT55 turbo, RTO12513,
4.11 SQHP rockwells

79 KW K100C 400BC1, Holset HT4B hybrid, custom
injectors, RTO12513, 4.33 eaton DS380s

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