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Unread 05-07-2009, 11:35 PM   #1
MikeyJ
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Oil Pressure.... too high?

Once warmed up I idle at say 35-40 and any acceleration in rpms it pins to 80... sometimes when highway driving and in 5th running 3k rpms I can smell a slight hint of oil in the air.

No oil on the air filter...
This high oil pressure seem okay?
Engine has had all seals done within the last couple years.

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Unread 05-07-2009, 11:54 PM   #2
JEEPorado
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It may just be your gauge, mine goes wacky and pins alot. Check for leaks and if your PCV is working properly. If you have no leaks, then the gauge is probably false because high pressure would probably cause a seal blowout. Since it happens at acceleration, I would say it's okay
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Unread 05-08-2009, 12:00 AM   #3
sprowley
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whacky pressure often indicates low oil or improper distribution of oil in the engine. Check and make sure you have the proper amount in, and if you can smell it you may be burning it.
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Unread 05-08-2009, 10:16 AM   #4
YJInterceptor
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according to my Haynes Manual, that sounds normal. Mine was all over the place until I replaced the oil sender unit, and then its read steady. At low rpms its around 40 and high rpms 80.
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Unread 05-08-2009, 11:58 AM   #5
kloppk
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I'd suspect the oil sender is on it's way out.
Your oil pressure is regulated by the oil pump and should not usually be above 50 PSI.
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Unread 05-08-2009, 05:46 PM   #6
MikeyJ
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Not the smell of burning oil... smell of just raw oil.

Its idling at 30 and pins when driving.
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Unread 05-08-2009, 06:49 PM   #7
YJInterceptor
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I looked it up in ther Haynes manual.

Chapter 2 Part D General Engine overhaul procedures
Page 2D-2
Oil Pressure
at idle...................25 to 35 psi
above 1600 rpm......37 to 75 psi

Mine was pegging as well. Replace your sender unit. You will need a special socket for it which you should be able to pick up when you get the sender.
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Unread 05-08-2009, 06:59 PM   #8
hicketts
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I just redid the lifters and rockers in my 2.5 and the gauge was doing the same thing before I started, even with a brand new sending unit. When I removed the valve cover the whole top end was nothing but sludge, I worked on hundreds of motors and have never ever seen something like this. I cleaned every thing really good and removed the oil pan and cleaned all of that. When I reassembled and started the motor the oil pressure returned to perfect operating pressures, I think it was so slugged oil couldn't flow correctly.
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Unread 05-08-2009, 07:55 PM   #9
50rck
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This may sound stupid, but I took all the fittings off the sender unit, including the bracket and cleaned all the sludge out. It works great now.

On a side note, hicketts, was Quaker State run in that motor. Over the years I have heard of that oil getting sludge on everything.
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Unread 05-08-2009, 08:02 PM   #10
Combat
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My gauge did this when my sending unit was going out. replace it.
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Unread 05-09-2009, 09:49 PM   #11
hicketts
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Quote:
Originally Posted by 50rck View Post
This may sound stupid, but I took all the fittings off the sender unit, including the bracket and cleaned all the sludge out. It works great now.

On a side note, hicketts, was Quaker State run in that motor. Over the years I have heard of that oil getting sludge on everything.
The story with the jeep was that the guy got into a bike accident and let it sit in his garage for like 6 years, he probably went out and started it for like 5 minutes every week and never got it up to temp. Before that a women owned it since new, and who's knows how often she changed it.

I have never had a problem with Quaker state, I just rebuilt my wife's subaru, because of a bad head gasket, 2.5L and always ran Quaker state and at 146,000, every thing looked great. Oh yea I also live in Pennsylvania and we are the Quaker state and the beginning of the oil industry. We have Pennzoil and other stuff like that
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Unread 05-09-2009, 10:41 PM   #12
pasinbuy
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One time I was driving form Florida to California and my oil pressure gauge dropped to Zero. I was on the highway no one around and this was before cell phones. I sat there for a moment to decide what to do.

I reasoned that a motor will run for hours with no oil. When you put load on it the motor will not last very far without oil. This much I know.

I started the motor and let it run for a few minutes looking into the valve cover I could see plenty of oil splashing around. So I knew the pump was still working. Got back into the car and drove on. replaced the sending unit when I reached my destination.

Sending unit go bad often.

Please research before you call me a liar about the motor running without oil. I have seen it. Also with the first motors the operator had to get out every mile or so to to squirt oil onto the motor. This was before autos had a fully enclosed lubricating system. The first gas motors also did not have a enclosed crank case. That was invented by George Selden, the same man that invented the automobile in 1877.
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Unread 05-09-2009, 11:37 PM   #13
Tom95YJ
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Sounds kinda high to me.

Mine runs at 20 when idling and 40 when driving
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Unread 05-09-2009, 11:41 PM   #14
Goobersbro
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when i start the jeep im between 45-60 then it warms up and it goes down to 40 then once i have been driving for over like 20 minutes it will drop down to like 35 at idle and depending on how hard im getting on it it will go up to like 60-70

Im good with mine though because in September i replaced the oil pump sending unit had a oil change and changed the oil filter and all my seals are good so im okay with my pressure
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