CM870 oil pressure low. jakes not working

[Signature620]

In your own words, you are 25% over the minimum allowable warm idle oil pressure. Those new style oil pumps can run slightly different pressure than the old style without issue. Nothing to be concerned about as far as I can see.

Run the engine with the valve cover off. Check for spinning cam bearings. Also push the top of each engine brake solenoid with a screwdriver. See if one of the solenoids is leaking constantly from the bottom or any of the Jake rockers spew oil while running (they will spit a bit out when you release the solenoid)