Cummins ISX 485ST low oil pressure

Yup, 40 psi is normal on the ISX when the truck is cruising.

 

There was a recall on my 14 isx from Cummins FOR The valve inside of the oil filter housing ,is to open the oil flow at a certain oil pressure when filter is to cloged with soot,...so it my take care of the sudden drop on oil pressure ...if recalled it is changed for free....y"ll may wanna ceck it out..

 

If you've still got lots of oil in the crank case that leaves only the oil pump unless your oil is so old that its become like jelly and the filter hasn't been changed for 4 years.

 

I got 04 isx 475 runs around 40 going down road but at idle it around 20 is that normal for oil pressure ?I just did a pm

 

right on the money.

 

I’m going to hijack this thread. Please bare with me and forgive my rudeness.

I have an 06 Pete with the twin cam isx.
“My mechanic and I are stumped and trying last thing to see if this fixes the problem.” With 280 miles on fresh inframe.
Replaced reman head with new head and new cams with new rocker shafts and rockers.
New bypass valve, new pump, new pump pressure regulator”and shimmed for higher pressure “, new pick up tube and o-ring, new pistions and liners, new mail and rod bearings. Motor is clean as a whistle inside and oil with new oil and filter.


Start motor and oil pressure is 45-50 psi and as the motor/oil warms up the pressure comes down. At 600 rpm and 220 temp on oil the pressure hovers at about 8psi and 20-22 psi at 1400 rpm.

About to change oil cooler and t-stat to oil cooler.

I’m ready to give up. Cummins is no help on this either ?

Ideas from those that actually been here and done this. Please no keyboard mechanics.

 

This has been verified with mechanical oil pressure gauge on the main oil gally, it’s 8 psi there toooooo.

Signed mr. Frustrated

 

What filter are you running? I have had aftermarket ones cause issues. LF9070 seems to be the best.
Also had a tech change an oil cooler and leave a plug in the main oil galley.
What type of oil? Pressure good before the inframe?

 

almost sounds like too much clearance on a bearing