Another N14 oil pressure question

Do you know for sure if you have a mechanical gauge or is it electric? If it’s electronic, that could be a power/ground issue. You could run a temp mechanical gauge just to confirm it.

I’m sure there are more people that know more about Cummins then I do. They may pipe off the correct answer any minute.

 

This is an electrical gauge and 5 psi fluctuation is more than normal nothing out of spec really. Also the other part need to know if the rpm is steady if rpm changes so will oil psi

 

Inspect the oil pressure sensor for oil wicking into connector @ sensor. Seen many cause the same problem as you show. Quick easy check. If oil is present, replace sensor and Cummins sells repair pigtails if oil had spread terminal receptacles.

 

I run 20 psi at idle with my n14. Idle set around 700 rpm. The pressure relief spring in the oil pump could be getting weak. It'll result in funky oil psi readings.
Best to run a mechanical gauge if you can. Otherwise 30-40 psi about all you'll see. Cummins N14 is a low psi high volume. If you drop to 20 at 1500, start pulling those piston cooler nozzles as they are plastic and can crack, causing a psi loss.

 

I have 2000 Century with N14, been driving it since new. My oil pressure gauge needle jumps from 30 to 35, just like yours, always been like that. Idle 12-15 psi at 600 rpm.