Cummins Low Oil pressure fix!

This will cover all 5.9 /6.7 Litre cummins engines. From years 1989-2020.
Truck will run fine all day once it’s started and pressure rises,
Initial issue was truck starts Oil pressure drops, Touch the throttle 1% APPS and the oil comes up, this was air being sucked back threw the two oil holes off the cooler, Oil pumps fine. Truck would run 60-80psi cold, warm 30-50psi depending on load and tune. Truck has 2 chips stacked, edge and smarty
The Oil cooler is located on the passenger side of the block, Gasket failure. 40$ in Felpro gaskets fixed the issue. Truck was shut off with 15psi oil pressure managed to save the crank and block by killing it whilst it failed, ended up just spinning the first bearing and it is all sanded off, truck is back together and running just fine with new rod bearings. Truck has 0.25’ BRG’s, this is a 2007 2500 5.9, 6spd G56, with south bend dual disk clutch

[@SpoonerTuner]

I just spun a bearing in my 1990 Civic. I cut strips of sand paper and then folded them in half length wise. Then used them to sand and polish my rod journal. Started with 400 grit and ended with 2500 grit sand paper. Plastigauged it with new bearings and shimmed my oil pump pressure relief valve spring with 0.1" of washers to bump oil pressure up. Runs good. But this only works if the rod and crank didn't get to hot and warped.

[@bigdawgink1379]

literly just bhad this exact same thing happen i went strait for the bottom end it got one bearing pretty good and lightly on another put all back togather but oil pressure gauge would comply drop to 0 after 30-40 sec after start up so shutdown for almost a week on this till i found ur vid and when i looked exacly like urs id have been looking forever to find this failure for sure so thank you for posting this vid game changer

[@secaymal]

Bf2mc life changed

[@GardeningInCanada]

Nice 👍

[@thee_ole_24v]

Did she make wierd screething noise off and on.? Wondering if i just have a bad oil pressure sensor. My new truck says about 2psi but i unplugged the sensor and replugged it back in and went to 40psu then dropped back down to 2psi when sitting idleing. Sick of this shit box already

[@dsadzaglishvili]

What happens if U dont put relief valve back there and run engine without it?

[@anewzack78]

15 oil pressure at idle or at load? Mine has had 15 psi at warm idle for quite some time now and im trying to determine where i should start with it. I'll be at a stop light with 15psi and as soon as i touch the throttle, oil pressure will come right up to 40 psi. cruises at around 45 psi. 260k miles

[@EsakinDieselPerformance]

15 is to low. You should be seeing 20+ mine cold in -40 goes up to 90 with compound turbos now and driving is 40-60psi, and idle is 20-30psi

[@anewzack78]

@@EsakinDieselPerformance thanks for the reply. Should I go ahead and take the oil cooler out for inspection? I see a gasket set is only $24.79 on rock auto. I’d replace the relief valve as well while I’m there.