N14 oil pressure issue

Could be several things, but if they did a full rebuild (including oil pump and cam bearings) it may be that they damaged the oil pickup "O" ring. Or it could be a bad seal on the new oil filter or a bit of dirt got between the oil filter seal and contact surface. or you may have over tightened the oil filter and caused damage to the filter

 

pressure relief plunger inside oil pump.easy to remove and replace orings and spring.usually never have to replace plunger itself.knowledgeable cummins parts guy will know off the top of his head which combo of orings,gaskets and spring you will need.about $40 in parts total.also good possibility oil pressure sensor on lower driver side of engine block goes bad quite often.problem is sensor is expensive and non-returnable if it is not the problem.only takes 5 minutes to change.you don't have to drain engine oil to do it.good luck.

 

mine did that a few years ago, it was the oil pressure sending unit. The computer in my engine is set up to shut the engine down, so I unplugged the connection to the sending unit and drove it to the nearest shop to get the parts to fix it. The CEL was on but at least I the engine didn't shutdown every time the engine thought the oil pressure dropped to zero.

 

I just recently bought a oil sensor here in OZ it cost $405.00 au, they are expensive little suckers

 

My celect when i unpluged the oil sensor did not seem to really make the ECM stuff up, or through codes (from memory) but when cummins hooked up the computer it showed a faulty oil sensor.

 

Been there, done that about three months ago.