fresh rebuild no oil pressure at idle when hot - Competition Diesel.Com

dangerous06 · 10-08-2017, 08:06 PM

Fresh build start up normal test drive normal stop at light and check gauges light comes on Oil pressure at zero yikes. Shut off check fluids all ok start up head home all ok sit at idle bamm zero oil pressure! Put a real guage on it and when cold 25psi at idle when hot ZERO! TOUCH PEDAL AND INSTANT OIL PRESSURE. let off idle 5 seconds zero oil pressure anybody have an Idea?
Already changed out the pressure spring no change. All I can assume is builder left out a plug somewhere! But where! has pressure just above idle about 800rpm.

turbo2387 · 10-08-2017, 08:19 PM

I have had issues with mechanical gauges on my vw's getting air in the reference line when you get into hard angles at low engine speeds. This then scares the hell out of you on flat ground at idle on the top of the hill when the gauge says ZERO! Is it possible you have air in a reference line?

9724VF350 · 10-08-2017, 09:01 PM

Cold pressure should be at least 50. I've seen wrong bearing sizes used on the crank, galley plugs left out, and oil coolers that have blockage. Usually I just put a big oil pump in to be safe. 50 psi hot idle is common with a big pump.

DISTURBED · 10-08-2017, 09:07 PM

I had an issue with a brand new Cummins marked with China oil pump. It did not set all the way in the block and allowed oil pressure to drop at idle. Pull the front cover and make sure it's seated all the way in the block. If I can find the pics on my phone I will post them

DISTURBED · 10-08-2017, 09:13 PM

First picture is the old pump I swapped back in to see how it sat. 2nd is the new pump and you can see the gap at the bolt hole

dangerous06 · 10-08-2017, 09:56 PM

yeah I'm gonna have to pull the front cover and check that pump for sure! I hate rework but this one I have to fix for sure ASAP!
Thanks DISTURBED!

Cflanery88 · 10-09-2017, 12:22 AM

Which engine?

jedeka · 10-09-2017, 07:04 PM

Is the thin plate on the back of the oil pump?

dangerous06 · 10-10-2017, 03:41 PM

I'll have the truck back Thursday and tear down then!

dangerous06 · 10-13-2017, 08:57 PM

OK Torn down nothing out of the ordinary so put a new pump in and STILL 40psi cold and zero when hot AT IDLE. Right off idle 40psi and steady. WTF??

BRE · 10-13-2017, 09:32 PM

It has a leak somewhere that it’s overcoming.
For instance, when the check ball comes out of a hpop on a 6.0, no oil pressure on the gauge at idle... the slightest bit off idle and boom!!! Oil pressure.

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Poulina · 10-13-2017, 10:22 PM

X2 for a leak somewhere is the circuit. Great analogy BRE haha

dangerous06 · 10-14-2017, 07:56 AM

Well besides a complete tear down guess I'm stuck with it! Fill it with Lucas!!

jedeka · 10-14-2017, 01:45 PM

Did you check main/rod bearing to crank clearance when assembled? Check oil pressure at turbo pressure port on oil cooler/filter housing. Maybe wrong cooler gaskets? I'm going from memory, since service manual is at the shop. Oil then goes to oil galley in the block on injection pump side. There is a soft plug behind the tappet cover in the crossover galley. There should be plugs at front and rear of the main oil galley. Did you put oil squirters in the block, below the main bearings?

dangerous06 · 10-16-2017, 08:56 AM

My builder has been putting motors together for me for years. I'm sure something was missed! really sucks I have to pull the motor! So my builder is giving me another motor but I'm screwed for time and my customer is screwed for inconvenience! At least he understands! I put straight 40 weight in it for the time being till we can set up a time to get this done!
Changing the regulator did nothing as I assumed. But was a wish!!

10-08-2017, 08:06 PM	#1
dangerous06 Name: dangerous06 Title: diesel tech Status: Not Here Join Date: Mar 2008 Location: Escondido CA Member`s Gallery Posts: 3,564	fresh rebuild no oil pressure at idle when hot Fresh build start up normal test drive normal stop at light and check gauges light comes on Oil pressure at zero yikes. Shut off check fluids all ok start up head home all ok sit at idle bamm zero oil pressure! Put a real guage on it and when cold 25psi at idle when hot ZERO! TOUCH PEDAL AND INSTANT OIL PRESSURE. let off idle 5 seconds zero oil pressure anybody have an Idea? Already changed out the pressure spring no change. All I can assume is builder left out a plug somewhere! But where! has pressure just above idle about 800rpm. __________________ E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built 48RE, 5" exhaust,Carrillo rods, Pacbrake!

10-08-2017, 09:01 PM	#3
9724VF350 Name: 9724VF350 Title: Tractor Guy Status: Not Here Join Date: Mar 2010 Location: Northeast Ohio Member`s Gallery Posts: 2,784	Cold pressure should be at least 50. I've seen wrong bearing sizes used on the crank, galley plugs left out, and oil coolers that have blockage. Usually I just put a big oil pump in to be safe. 50 psi hot idle is common with a big pump. __________________ 97 F350 4X4 CC Dually 5spd 24V 913 S300/HT3B Ranch Hand. Playtoy-Oliver 1655. 12V now, 13mm, S475 Wife's ride-03 Excursion 12V swap in the works.

10-08-2017, 09:07 PM	#4
DISTURBED Name: DISTURBED Title: YEA WE RIDE THE SHORT BUS Status: Not Here Join Date: Nov 2007 Location: Winchester, Va Member`s Gallery Posts: 6,417	I had an issue with a brand new Cummins marked with China oil pump. It did not set all the way in the block and allowed oil pressure to drop at idle. Pull the front cover and make sure it's seated all the way in the block. If I can find the pics on my phone I will post them __________________ Thanks, Jeremy 01 CTD Retired sled puller, dedicated "Twin Turbo" tow rig 96 CTD "TOO" Disturbed 3.0 - Built by Disturbed Diesel Performance 96 CTD "The Sickness" 2.6/2.8- Built by Disturbed Diesel Performance

10-08-2017, 09:56 PM	#6
dangerous06 Name: dangerous06 Title: diesel tech Status: Not Here Join Date: Mar 2008 Location: Escondido CA Member`s Gallery Posts: 3,564	yeah I'm gonna have to pull the front cover and check that pump for sure! I hate rework but this one I have to fix for sure ASAP! Thanks DISTURBED! __________________ E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built 48RE, 5" exhaust,Carrillo rods, Pacbrake!

10-09-2017, 12:22 AM	#7
Cflanery88 Name: Cflanery88 Title: Too Much Time Status: Not Here Join Date: Feb 2016 Location: Shelby, MI 49455 Member`s Gallery Posts: 536	Which engine? __________________ 06 Dodge Ram 2500 6.4L, Wagler +.080 rods, Hobbit tuned, Exergy150% injectors,Polished s475/87 1:0 A/R Engineered Turbo Billet Wheel,arp625s,14mm main studs,PPE dual fuelers,Hamilton 188/220,extreme pushrods,Fleece bypass/drains/distribution block,110#springs.

10-08-2017, 08:19 PM	#2
turbo2387 Name: turbo2387 Title: Nipple Fluffer Status: Not Here Join Date: Jun 2011 Location: Indiana Member`s Gallery Posts: 665	I have had issues with mechanical gauges on my vw's getting air in the reference line when you get into hard angles at low engine speeds. This then scares the hell out of you on flat ground at idle on the top of the hill when the gauge says ZERO! Is it possible you have air in a reference line?

10-09-2017, 07:04 PM	#8
jedeka Name: jedeka Title: Too Much Time Status: Not Here Join Date: Oct 2009 Location: Boone, Iowa Member`s Gallery Posts: 1,413	Is the thin plate on the back of the oil pump? __________________ 1996 Dodge Ram 2500 4x4, 5 spd. 4.88 gears, 2.5" turbo, Smokem inj, 5000 rpm springs, NV271, South Bend dd clutch, 33x12.50-15 STS tires, 6 inch stack, custom valve springs 2005 3500 4x4 dually, auto, KORE leveling coils, 19.5 wheels, Smarty Jr

10-10-2017, 03:41 PM	#9
dangerous06 Name: dangerous06 Title: diesel tech Status: Not Here Join Date: Mar 2008 Location: Escondido CA Member`s Gallery Posts: 3,564	I'll have the truck back Thursday and tear down then! __________________ E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built 48RE, 5" exhaust,Carrillo rods, Pacbrake!

10-13-2017, 08:57 PM	#10
dangerous06 Name: dangerous06 Title: diesel tech Status: Not Here Join Date: Mar 2008 Location: Escondido CA Member`s Gallery Posts: 3,564	OK Torn down nothing out of the ordinary so put a new pump in and STILL 40psi cold and zero when hot AT IDLE. Right off idle 40psi and steady. WTF?? __________________ E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built 48RE, 5" exhaust,Carrillo rods, Pacbrake!

10-13-2017, 10:22 PM	#12
Poulina Name: Poulina Title: Too Much Time Status: Not Here Join Date: Dec 2015 Location: Norcal Member`s Gallery Posts: 795	X2 for a leak somewhere is the circuit. Great analogy BRE haha __________________ 2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle

10-14-2017, 07:56 AM	#13
dangerous06 Name: dangerous06 Title: diesel tech Status: Not Here Join Date: Mar 2008 Location: Escondido CA Member`s Gallery Posts: 3,564	Well besides a complete tear down guess I'm stuck with it! Fill it with Lucas!! __________________ E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built 48RE, 5" exhaust,Carrillo rods, Pacbrake!

10-14-2017, 01:45 PM	#14
jedeka Name: jedeka Title: Too Much Time Status: Not Here Join Date: Oct 2009 Location: Boone, Iowa Member`s Gallery Posts: 1,413	Did you check main/rod bearing to crank clearance when assembled? Check oil pressure at turbo pressure port on oil cooler/filter housing. Maybe wrong cooler gaskets? I'm going from memory, since service manual is at the shop. Oil then goes to oil galley in the block on injection pump side. There is a soft plug behind the tappet cover in the crossover galley. There should be plugs at front and rear of the main oil galley. Did you put oil squirters in the block, below the main bearings? __________________ 1996 Dodge Ram 2500 4x4, 5 spd. 4.88 gears, 2.5" turbo, Smokem inj, 5000 rpm springs, NV271, South Bend dd clutch, 33x12.50-15 STS tires, 6 inch stack, custom valve springs 2005 3500 4x4 dually, auto, KORE leveling coils, 19.5 wheels, Smarty Jr

10-16-2017, 08:56 AM	#15
dangerous06 Name: dangerous06 Title: diesel tech Status: Not Here Join Date: Mar 2008 Location: Escondido CA Member`s Gallery Posts: 3,564	My builder has been putting motors together for me for years. I'm sure something was missed! really sucks I have to pull the motor! So my builder is giving me another motor but I'm screwed for time and my customer is screwed for inconvenience! At least he understands! I put straight 40 weight in it for the time being till we can set up a time to get this done! Changing the regulator did nothing as I assumed. But was a wish!! __________________ E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built 48RE, 5" exhaust,Carrillo rods, Pacbrake!