cummins n 14 conversion

farmboy

Member
well we have strayed from the question greatly... we shall start over... would I have to change cam, heads, ts injectors, rocker arms, pt pump, or?????? to make it run or would none of it work....
 

Truck Shop

Well-known member
Yes we have strayed, Yes you will have to change cam, injectors, pump and so on. Lots of money and in the end probably not run so good. There's the compression ratio to look at also.
You need to compare your N14 specs to a BC III CPL 625 for a good example. The timing code between those two engines is important. But IMO you are going backwards the N14
electronic engines were damn good engines, run and perform way smoother than a Big Cam. I think your engine will run provided some time and patience is used to trouble shoot
the problem. Below is the wiring diagram for both N14's Select and Select plus. If it prints out.
Technically you will have to change cylinder heads, rocker boxes, water rail and jakes also. I also attached the difference in the injector body's, top stop injectors won't work with
N14 heads.

Truck Shop

View attachment 3666018-04Celect.pdfView attachment 3666146-04CelectPlus (1).pdfs-l1600 (5).jpgs-l1600 (7).jpg
 
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rzucker

Well-known member
well we have strayed from the question greatly... we shall start over... would I have to change cam, heads, ts injectors, rocker arms, pt pump, or?????? to make it run or would none of it work....
I don't think we strayed far. Making this run will be far cheaper than converting it to a cold start smoke blubbering old style beast. Can you find somebody that can hook up diagnostics and put a few questions to bed? If it ran before it shouldn't be a big issue to find the problem.
 

Truck Shop

Well-known member
I would be in the same boat as you, salvage yard or Cummins for a ECM. Now what determined that it's electrical and or ECM?

Truck Shop
 

rzucker

Well-known member
I would be in the same boat as you, salvage yard or Cummins for a ECM. Now what determined that it's electrical and or ECM?

Truck Shop
Umm, yeah. Is this really an ECM issue or what? The OP hasn't really offered much information to make that determination. Again, like I said plugging in to it would be where I start. Paying somebody to do this could be cheaper than spraying expensive parts at it.
 

farmboy

Member
nothing really. I have power at 20,21,22,23, and the tach worked for one cranking cycle, new cam sensor, no saved data at road relay, very very weak signals at injectors, clean connections (grounds and hots) most of all im pissed at the corrosion at the computer plugs . my local says bring me the computer we will test it for you. lol. the computer will not unplug from harness I am about to buy new connectors 125 dollars each and change the wires one at a time.
 
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