Oil Pressure

[Viper1]

This is my first diesel, a 2017 Longhorn 6.7, and my question is what is considered normal oil pressure. The truck has just barely over 8,000 miles never pulled anything yet. The engine temp seems normal at 190-195 and engine oil temp 198-201 has never been over 203. While idling it shows 30-35 depending on temp and driving at 75-85 mph it shows 47-52. Having only driven gasoline PU’s in the past their pressure is much higher. My 2002 Sierra 5.3 idles at 40-45 and runs at 55-60. Thanks.

 

[6V92TA]

in general the minimum oil pressure for safe operation on a Cummins ISB is 10@ idle and 30psi @ hi idle.
you are good to go.

 

[Viper1]

in general the minimum oil pressure for safe operation on a Cummins ISB is 10@ idle and 30psi @ hi idle.
you are good to go.

Wow, if I had seen 10 at low idle I would be turning it off and calling wrecker. Thank you for your response.

 

[SnoKing]

RAM/Cummins oil pressure is a computer generated guesstimate and not an actual pressure reading.

 

[Hitec.Redneck]

My 2014 shows the same oil pressure you posted.

 

[jhenderson]

Your oil pressure and oil temp are a product of a computer algorithm. They are not actual readings. Do a search on this forum for full info.

 

[6V92TA]

ISB6.7 CM2350 B101 Operation and Maintenance Manual

Oil Pressure
Low Idle (minimum allowed) 69 kPa [10 psi]
At Rated Speed (minimum allowed) 207 kPa [30 psi]

Maximum Oil Temperature 138°C [280°F]

 

[Newsa]

ISB6.7 CM2350 B101 Operation and Maintenance Manual

Oil Pressure
Low Idle (minimum allowed) 69 kPa [10 psi]
At Rated Speed (minimum allowed) 207 kPa [30 psi]

Maximum Oil Temperature 138°C [280°F]

Why are high idle and rated speed the same min oil pressure. Isn't high idle like 1100-1200 rpm? Or can you choose the idle speed /rpm at high idle

 

[jhenderson]

Your idea of high idle and Cummins definition are far different. Rated speed is the rpm that’s used for hp/ torque numbers. High idle is the max governed speed, unloaded.

 

[6V92TA]

Newsa, high idle is full throttle unloaded, JHenderson stated. fast idle is something else.

anyway, 10 psi at idle and 30 at max rpm are the minimums.

old rule of thumb of oil pressure was 10 psi for each 1000 rpm. it more or less applies to Cummins

 

[sag2]

The bottom line is it's a fake number anyway. Unless you install a mechanical gauge, as long as it's above 6 psi the cluster will show what a customer might expect.
Don't give it another thought, I still have not seen a oil related failure on a 6.7, or a 5.9 for that matter.