L10 Cummins. -one day good oil pressure and next day extremely low ISSUE

[Nathaniel McClain]

That's my train of thought as well.

I would....

(1) Verify the oil pressure gauge operation using a test gauge.

(2) If gauge test backs up the existing gauge readings see if the skipping and low oil pressure coincide. But an issue with the oil pressure due to bypass valve or other issues may cause the STC distress, or vice versa...I don't envy you on this one......

(3) Order or borrow a printed manual specific to the CPL of your engine. It's not on Quickserve as you discovered...but you can order it from Cummins...

Tanks for the input. I really appreciate it

 

[mwilson]

And conversely the STC oil control valve on the side of the block might dump oil pressure and cause the cold skip and gauge fluctuations if it malfunctions....you need to round up a tech that worked on those back in the day..might save you a lot of time and money....mixer companies ran those L10 engines a lot...

We never worked on many here....

 

[Wayne M.]

DSNY had plenty of L10’s. One series each of front load and rear load collection trucks, a few series salt spreaders, some landfill equipment, I think a large off road Case FEL. they were being phased out as I was getting up to speed, but I got to know a little about them. Obviously some had STC, because I found that paper.

 

[Nathaniel McClain]

Give me the ESN and I’ll post some illustrations for you..

I pulled oil cooler and checked that valve and replaced along with oil thermostat. No changes. I’m trying to find the main oil pressure regulator but cannot get good data on it. Anyone have a diagram for this or know where it’s at?

I’ve heard someone say there is a hex cap that you inflected but man I can not find it

 

[ScottClardy]

I pulled oil cooler and checked that valve and replaced along with oil thermostat. No changes. I’m trying to find the main oil pressure regulator but cannot get good data on it. Anyone have a diagram for this or know where it’s at?

I’ve heard someone say there is a hex cap that you inflected but man I can not find it

Man I’m in the same boat with my L10. I can’t find this oil pressure regulator either. 931-619-7007, please call me.