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The N14 Cummins was definetly one of Cummins most popular engines. Used to power everything from over the road trucks to motorhomes to mining equipment to generators, the Cummins N14 was very versatile.
The Cummins N14 was built on the basic design of the 855 cubic inch Cummins engine. In the early 1990's, Cummins redesigned the engine with electronic controls to meet EPA regulations. The redesigned engine, known as the Celect fuel system, featured an Electronic Control Module (ECM) and electronic injectors. Although injectors were still cam activated, the Cummins ECM controlled fuel at the electronic injectors.
In 1997, Cummins released the upgraded N14 with the Celect Plus fuel system. Although not noticably different looking, the Celect Plus ECM has many more adjustable parameters for customer fine tuning.
The Cummins N14 was discontinued around 2000, and has been replaced by the Cummins ISX.Use the charts below for useful information for the N14:Engine Ratings
I would say that if you pressurized the oil system with the pan off and didn't see any extra leakage then I would start with the new oil pump that was installed could be failing or not shimmed up correctly. or maybe the oil pressure relief valve spring is weak or not sealing completely. Its possible that the new oil pump has failed. Sometimes new parts are always good. Hope this helps
Well I have never seen it happen on this engine but I suppose anything is possible. Im kinda running out of ideas.
I have seen main bearing marked wrong they would say there std size but would really be .010 undersized. This happened to me on a 466 international. It was not making any noise but was loosing oil pressure big time. We ended up rolling the main bearings back out and measuring them and found out the one was undersized.
Well if they plastic gaged the new bearing then I'm sure that not the problem.. Let me call around tomorrow to a few friends of mine and ask then if they seen this before. I'm just running out of ideas... Sorry. But I will let you know something tomorrow about what they think or if they can give me any other ideas...
I called a friend of mine and he said he has seen the gear on the oil pump shaft start slipping. And also the pistons coolers brake off would cause this .
I will do some more checking tomorrow and let you know if I come up with anything else..
I checked with some mechanic friends of mine today and they couldn't come up with any new ideas. I'm going to email our conversation to the other heavy experts on here to see if they can help..