N14 celect plus stutter in high gears

Fuel demand being the highest in the top gears, I would continue looking at the fuel system including tanks, pickup tubes, filter heads etc. Sucking a bit of air into the system or a restriction could cause this problem.

 

When you're dealing with this type of problem, never overlook the simplest things, which is usually the cause. Yes, it could be one of many things including those mentioned, but cover all the basics first that require no cash for parts, only your labor. Don't spend $2500 on parts you don't need to find out you have a crack in a fuel tank standpipe or some foreign debris in a fuel tank or a fuel filter sucking some air. As for as the return side, I would only check for excessive air being returned from the engine.

 

my boy had trouble with his doing that when running thru the rain. He took the control under the foot feed apart and sprayed it with electric contact cleaner and no more miss or stutter

 

Very good point, i have seen this as well.

 

Since you were having the problem before the upgrade, I doubt it's the cause.

 

That N14 is a pretty cool engine. When we got his tractor it had an awful noise in it.Had a couple cummins shops tell us that was normal for an N14.The guy I go to said it had head gasket problems. We took the haeds off and had two blown gaskets and the tops of two liners were gone.We pulled the engine out and sent it to the machine shop did everything that needed done.Put it all back together with new cummins parts. That thing is doing a terrific job.It only has about 17000 miles on it and pulls a dropdeck trailer most of the time. last time out he got 7 mpg tank to tank and he pulled town hill mountain east out of Breezewood Pa on 70 with 48000 on in high gear. Now if he is telling the truth I am impressed.I hate to say it but my old 425 cat with a gazillion miles on it will not pull like that.