[yellowdub]

i need help i just bought a 2006 quad cab that has 59000 miles on it. it does the start up and sit at 40 psi then after a few minutes drops to 0 then you shut it off and it does the same thing i found that the turbo is shot. i did a oil pressure test on top of the oil filter port and its about 2psi what should it be ? i need to go to the hose place tomorrow and get a fitting for the sensor so i can do a manual pressure reading. what should i do next to fix it i dont want to throw a new turbo on it and have it do the same thing again obviouslly their is a oil pressure problem.help me i am a gas engine wizz but this is my first diesel and its a blank for me. if you can give me your number and i will call you or you can call me at 801-389-3520 any help understanding this motor and i would be happy

 

[ohioviper]

You should be covered under the 100k mile warranty. Have it towed into the dealer.

 

[yellowdub]

truck was a thieft recovery with a rebuilt restored title and the dealer has it as restricted for warranty

 

[ohioviper]

Have you tried changing the oil filter and oil ? Possible causes would be plugged filter. Weak or bad oil pump, seal out of turbo. You say the turbo is out how do you know ? Is it dumping oil ? If the turbo is blown the seal its prob dumping alot of your pressure.

 

[yellowdub]

i havnt changed the oil yet but i will tomorrow also i took the intake tube off the turbo and i can move the vanes all over the place. the truck doesnt smoke at all and i cant see any oil inside the turbo at all. the oil is full. if i dont have any oil pressure at the oil filter top plug where should i go next looking

 

[yellowdub]

well i put a T fitting setup on the oil press sender on the side of the block under the intake and installed the original sender and a manual reading gauge and started the truck, found oi pressure to go to 40 psi and drop slowlly as the truck got warmer. after about 5 minutes of running the dash gauge went to 0 and i saw on the manual gauge was it was at 6.5 psi.all in all the gauge never went past 6.5 psii talked to a guy at a diesel shop here locally and he said it should not ever go that low. he said it might be the pump but he has never seen one go bad but their is a first for everything so im going to pull the front cover tomorrow and see what is going on in their. WHAT DO YOU GUYS THINK.

 

[sllorca]

When you say it is restricted for warranty, do you mean that they wont cover your engine at all?

 

[JETuning]

When you say it is restricted for warranty, do you mean that they wont cover your engine at all?

This is most likely the case. When an insurance company salvages a vehicle all warranties are voided. Typically.

 

[yellowdub]

yah i called my local dealer and se looked it up and it just said restricted so i called dodge and they did some looking and all it said was restricted also so i guess since it was a theft recovery it is reported to the dealer to void all warantes.

 

[agalaczy]

Dude.Slow down!!!It might benefit you to try the simplest thing first.Your oil filter might be plugged.If there is a FRAM oil filter on your truck it most likely WILL be plugged as these are known to disintegrate.As someone earlier said,the oil pumps on our trucks are quite stout and not known to fail.Good luck keep us posted.

 

[yellowdub]

ok i checked the oil filter its a dodge one i didnt cut it open but it looks fairlly new the oil viscosity isnt too thin and its clean no fuel or metal. i pulled the oil pump and cleaned it up nice and pretty then i took it all apart it looks kinda pitty but not what i would expect it almost looks like someone took a small ball pein hammer and dimpled it not smoth as glass. i took a feeler gauge to it and it measures .25mm between the impellers

 

[byrd126]

I am also have the same problem but i am not getting any oil at all. I just rebuilt the engine but everything works except the oil pressure. Ive also talked to some other diesel mechanics and they said they have never seen a pump go out. Im stumped too

 

[coblanchard]

Cut the oil filter open and see if you have any metal in it.

 

[coblanchard]

Here is what the manual lists as possible causes of low oil pressure.

1. Low oil level.
2. Oil viscosity thin, diluted or wrong
specification.
3. Improperly operating pressure
switch/gauge.
4. Relief valve stuck open.
6. If cooler was replaced, shipping
plugs may have been left in cooler
7. Worn oil pump.
8. Suction tube loose or seal leaking.
9. Loose main bearing cap.
10. Worn bearings or wrong bearings
installed.
11. Directed piston cooling nozzles
under piston, bad fit into main
carrier.
12. Loose oil rifle plug with saddle-jet
style nozzles
13. Loose directed piston cooling
nozzle.
14. Both J-jet and saddle jet style
cooling nozzle installed.

 

[coblanchard]

Here is the operation of the lube system

OPERATION
A gerotor style oil pump draws oil from the crankcase through the suction tube and delivers it through the block
where it enters the oil cooler cover and pressure regulator valve. When oil pressure exceeds 517 kPa (75 PSI), the
valve opens exposing the dump port, which routes excess oil back to the oil pump.
At the same time, oil is directed to a cast in passage in the oil cooler cover, leading to the oil cooler element. As the
oil travels through the element plates, it is cooled by engine coolant traveling past the outside of the plates. It is
then routed to the oil filter head and through a full flow oil filter. If a plugged filter is encountered, the filter by-pass
valve opens, allowing unfiltered oil to lubricate the engine. This condition can be avoided by frequent oil and filter
changes, per the maintenance schedules found in the owners manual. The by-pass valve is calibrated to open when
it sees a pressure drop of more than 345 kPa (50 psi) across the oil filter.
The oil filter head then divides the oil between the engine and the turbocharger. The turbocharger receives filtered,
cooled and pressurized oil through a supply line from the filter head. The oil lubricates the turbocharger and returns
to the pan by way of a drain tube connecting the bottom of the turbocharger to a pressed in tube in the cylinder
block.

 

[yellowdub]

so from what your saying i could have a weak oil pump (which im replacing today), a pressure regulator valve after the oil pump stuck wide open that is just dumping oil back to the pump,if that is good i could have a plugged filter that i havnt verified is good only asume is good because its a oem filter . i did do a pressure test on the top of the filter housing and had about 4 psi also did a pressure test at the sender and found 40 psi at start up and loosing pressure to 6.5psi as the truck warmed up or about 5 minutes on a 65 deg day.
WHERE IS THE OIL COOLER COVER SO I CAN FIND THE OIL PRESSURE REGULATOR VALVE?

 

[yellowdub]

ok i put a new oil pump on and a new turbo today started it up and the manual gauge went to 50 psi till it got warm then droped slowly to 6 psi again. i checked the filter bypass valve on the top of the filter housing and it seems fine is their a pressure control valve or spring that im missing. help i need my truck friday.

 

[Matt06]

I have experianced the same issue with a 505 "C Series" Cummins. I found the the oil pressure relief was sticking which allowed normal oil pressure when cold but as the engine warmed to normal operating temperature the oil pressure would drop to about 10 psi. I replaced the pressure relief and it cured the issue. It maybe something to look into.

 

[yellowdub]

i droped the pan today and found about a half inch of thick sludge almost like chocolate pudding i cleaned it all out and now have to waite to go to the dealer tomorrow to get a new gasket. i think i found my problem. i hope.

 

[billw]

If you have the pan off take a look at the cooling nozzels. If they are fine then buy a new relief valve. My best guess is the relief valve.