Cummins 6CTA idle oil pressure 10psi, 2000 RPM pressure 45-50

[racing4funn]

This seems very low but Ive never had one of these trucks so I dont know. If it is in fact low thought about pulling the sensor and installing a direct gauge to the port to see what it reads. If its the same then oil pump problems if it reads stronger then gauge problems.

Is 10 psi low for idle?

 

[diesel dave]

Yes,way low.check the gage.

 

[maccus]

It seems sort of low to me also.. However both the older (2004) and the new (2012) issue of TM 9-2320-272-10 both say that the normal idle pressure is 15 psi. Page 2-3 in the old manual and page 0004-3 in the new manual. Got to love those manuals........

 

[Suprman]

Is it higher until it warms up? The oil is thinning out you can go a grade thicker. 10psi of pressure per 1k rpm is fine

 

[racing4funn]

Is it higher until it warms up? The oil is thinning out you can go a grade thicker. 10psi of pressure per 1k rpm is fine

So your saying that 10psi on a warm motor is acceptable?

 

[Suprman]

If it goes up with the rpm then yes it should be fine. What are you idling at. It should be around 650-700 rpms I think. If you have only 10 psi at 1500 rpms then that's not right. It should go right up to 30-50 psi when you give it gas.

 

[Castle Bravo]

I get what looks like 10 PSI sometimes at idle on my 6CTA. Its tough to tell with the gauge delineations being what they are.

 

[racing4funn]

I get what looks like 10 PSI sometimes at idle on my 6CTA. Its tough to tell with the gauge delineations being what they are.

Yea hard to read or really know what its reading here too. I will check the just off idle pressure.

 

[racing4funn]

ok it runs nearly 60 psi cold at idle and then 10 or a little over when its warm. it quickly climbs just off idle..

Normal?

 

[Suprman]

Yes mine are the same way

 

[racing4funn]

Yes mine are the same way

good to know.. Ive never seen anything else like it. But Ive never been around large diesels either

 

[SLOrazorsedge]

Just picked up a NOS M931A2 with 13 miles and 9 hrs on the clock. Oil pressure at start up is just under 60 psi, settles to 30 psi after warmup. If you allow it to idle for a bit it settles down to a tick over 10 psi. If you bump the throttle it immediately pops up. Made me nervous too.

 

[racing4funn]

Just picked up a NOS M931A2 with 13 miles and 9 hrs on the clock. .

and I thought my truck was new with 30hrs and 7xx miles.. Nice