Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Cummins 6c oil pressure
Tony Athens.Hello,
2004 Cummins 6c 8.3 engines in boat.
I was curious what the oil pressure range should be at idle and how it should fluctuate during running and if there is a way to test the sending unit before I potentially replace that?
Thank you
The oil pressure you “see” on the gauge at the panel may or may be the actual OIL PRESSURE in the main oil gallery or the OP going into the oil filter. Between the sender wearing out over time or the gauge “sticking”, use that gauge as a base indicator only..
To your question:
Seeing 40-80 PSI at medium to high RPM’s seems average and 10-20 PSI when idling (engine hot) is normal. going below an actual 10 PSI when hot at a low idle below 700 RPM is quite normal–Nothing to worry about.
The only way to really know is to install a high quality liquid filled 0-200 PSI gauge on the engines main oil gallery—- Use a High Pressure #4 hose hose when doing so.
In general, the Cummins mid-range engines run a lower oil pressure than most seem to think they should –It’s by DESIGN…I use the term– “Low pressure, high flow by design”….Some later oil specs attached for the newer “Q” engines………….It will surprise many..
Tony
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