Engine/Transmission (1998.5 - 2002) Oil Pressure Question

[Toshiro]

2001 34,000 miles... .



Maybe a dumb question... .



I live one mile from Highway... .



First startup of the morning the oil pressure gauge is normal (in the middle)

When I get to the highway and accelerate to speed, the gauge climbs all the way to the right... .



Once the truck is warmed up it does not do that when accelerating.....



? Is that normal for a cold engine... . ?



Thanks... .

 

[Alan Reagan]

It is not abnormal. Usually they will climb to about 60 psi when cold. However, with that said, one of the problems with aftermarket filters on these trucks is the high initial oil pressure. It will destroy a filter if the filter is not manufactured for the high (I believe it is 80 psi) pressure when first started.

My 98 and 01 didn't climb all the way to the right but both would get up there pretty high when cold. Now my 05 has the dummy gauge controlled by the computer that pretty much stays at just over 40 (center of the gauge).

 

[CRead]

Sounds normal cold oil makes higher pressure. I try to be easy on mine till she gets some heat so I dont pop a filter I have seen this once or twice on heavy equipment makes a heck of a mess and not good on the engine but your truck is normal don't worry.

 

[Toshiro]

thanks guys... I feel better now... . lol... .

 

[RJWEST]

install a real mechanical oil pressure gage,
the dash gage is not real oil pressure...

 

[J.BURCHFIELD]

RJWEST; That is what I did after I changed the electric sensor 3 times. On a hot day the electric Gage would go to zero and scare me when the chimes would go off. I took the sensor out and put in a brass tee and put the sensor back in and ran a hose to a mechanical gage next to the ash tray. Now when the chimes go on I look and see. If I have 15 pounds on my mechanical gage I have peace of mind. Thinking about disabling the chimes. We never had chimes in the old days and we got along just fine.

 

[RJWEST]

I installed RED warning lights for the oil and fuel pressure systems.
And A Buzzer
The system is Armed when starting, Lights a lite and turns on Buzzer
At my age, just feel better with a reminder,
I agree on the chimes, there like car alarms, get used to them, ignore them... #ad

 

[J.BURCHFIELD]

RJWEST, What you did looks good. A few years ago I started carying an extra set of keys after locking myself out due to ignoring chimes. They are useful if you agree with them. The only time I hear them is when the electric oil sensor goes to zero. I don't go by the low fuel Icon. I set the trip odometer and never go over 400 without filling up. I am checking milage anyway. Dodge used fuel gages built by the lowest bidder. I am not going to drop the tank and instal a new sending unit only to have it go bad soon after. Must be the same outfit that makes the oil pressure sensor.

 

[DNewell]

Maybe someone can confirm this for me, but am I correct in thinking that from 2nd gen to 3rd gen, Dodge/Cummins went from HPLV to LPHV style oiling systems?

the reason I ask is that I had a buddy install an Amsoil bypass filter setup on his 3rd Gen truck, and had all sorts of problems with it making a buzzing noise. the only thing that I could think of was the spring that is in the bypass plate, that controls the amount of oil that flows to the bypass filter, would compress after building a little more than standard pressure and then flow a minute amount of oil to this side, but since the system was a low pressure system, it couldn't keep the spring compressed and would spring back. This could potentially create a buzzing noise as this could cycle quite often, creating a kind of buzzing sound.

On the 3rd generation trucks, it seems that if the numbers are reading correctly, the manufacturer has changed to a lower pressure system. Am I correct?



Also, my truck does the same thing. I run 15w40 Amsoil Heavy Duty synthetic, and I generally get around 80+psi when the oil is cold, but when it fully warms up, it sits right around 60psi. I haven't verified this with a manual gauge, but I suspect that my dash gauge is about right.

 

[RJWEST]

JBurchfield, I always mark fuel gage reading and gallons filled, don't trust
fuel quanity gages, especially dodge. ( old airplane thing )
If I ever have to pull the tank , I think i will replace the sender and install a digital gage,,,,
Dnewell, I think you have a real oil pressure gage
newer ones have a computer calculated indicator...
My mech reads 80 psi cold ( florida ? ) 60 hot ,

Oil pressure buzz ??? Sorry, no help from me,

 

[icman95]

Maybe someone can confirm this for me, but am I correct in thinking that from 2nd gen to 3rd gen, Dodge/Cummins went from HPLV to LPHV style oiling systems?

the reason I ask is that I had a buddy install an Amsoil bypass filter setup on his 3rd Gen truck, and had all sorts of problems with it making a buzzing noise. the only thing that I could think of was the spring that is in the bypass plate, that controls the amount of oil that flows to the bypass filter, would compress after building a little more than standard pressure and then flow a minute amount of oil to this side, but since the system was a low pressure system, it couldn't keep the spring compressed and would spring back. This could potentially create a buzzing noise as this could cycle quite often, creating a kind of buzzing sound.

On the 3rd generation trucks, it seems that if the numbers are reading correctly, the manufacturer has changed to a lower pressure system. Am I correct?



Also, my truck does the same thing. I run 15w40 Amsoil Heavy Duty synthetic, and I generally get around 80+psi when the oil is cold, but when it fully warms up, it sits right around 60psi. I haven't verified this with a manual gauge, but I suspect that my dash gauge is about right.

Buzzing from bypass setup: Had this happen to me the first time out after installing it and got really nervous thinking that I was starving the engine for oil. Parked truck and took Jeep. Emailed Amsoil and they explained that Cummins builds -in their words- "a robust" oil pump that makes a lot of noise normally. When you put on the bypass system it gives the vibrations/sound waves from this noise a pathway out of the engine and into the rest of the truck. The noise was always there. You just created a way for you to hear it. They said it's a coin toss as to whether or not a particular truck will do this. Some do and some don't. I learned to live with it and now I don't really hear it unless I try to.

 

[DNewell]

Thank you icman95! I was always a little curious about this. he ended up taking the system off and I think that he was going to sell it second hand. I haven't heard anything from mine, but I've got straight exhaust and the older style 24v, so it already makes lots of noise. I was just curious on the HPLV or LPHV on these motors. In my mind, I was thinking that this could cause it. I appreciate the response!

 

[icman95]

No prob. If I had someone explain that to me a few years ago it would have saved a lot of sweating that day worrying about a blow motor. Live and learn.