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Old January 21st, 2010, 09:43 PM   #1
chevyk10
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F150 low oil pressure

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Last edited by chevyk10; February 17th, 2010 at 11:01 PM.
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Old January 21st, 2010, 09:51 PM   #2
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the number one cause of low oil pressure is worn bearings. did you hook up a manual pressure gauge you can hook to it?
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Old January 21st, 2010, 10:04 PM   #3
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the number one cause of low oil pressure is worn bearings. did you hook up a manual pressure gauge you can hook to it?
I really have no idea how to hookup a manual gauge, but we're gonna try to tomorrow. Like I said I really don't think the bearings are worn because usually the motor will start knocking if they are. The guy I bought it from just told me the oil pressure gauge has been reading low for a while now, and he's been driving it anyway without any problems. He says the gauges might be fucked, which I'm actually starting to believe since the other gauges have issues too. Better to be safe then sorry though.
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Old January 21st, 2010, 10:18 PM   #4
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First you really need to verify oil pressure with a mech. gauge. I would buy a mech. gauge and install it permanently in the truck so oil pressure can be monitored.

The gauge in the dash is not a "gauge" it is more of a indicator of pressure. The sending unit is only a switch that closes with any oil pressure. There is a resistor in the cluster that is designed to place the needle somewhere in the normal range. It has NO way of indicating how much oil pressure is there, just that there is some. It is very common for them to read differently as they get older.
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Old January 21st, 2010, 10:34 PM   #5
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First you really need to verify oil pressure with a mech. gauge. I would buy a mech. gauge and install it permanently in the truck so oil pressure can be monitored.

The gauge in the dash is not a "gauge" it is more of a indicator of pressure. The sending unit is only a switch that closes with any oil pressure. There is a resistor in the cluster that is designed to place the needle somewhere in the normal range. It has NO way of indicating how much oil pressure is there, just that there is some. It is very common for them to read differently as they get older.
Yeah, I've heard about those "dummy gauges". My friend says its possible that the oil pressure is fine. He says if its just a little bit under "normal" the gauge will just switch off and read 0 or low. It could just be the gauge. I really haven't noticed any difference in how the motor runs, even when it reads 0 oil pressure. I actually drove it all day today with very low oil pressure and yet it still runs without a knock.
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Old January 21st, 2010, 10:36 PM   #6
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Originally Posted by frdboy View Post
First you really need to verify oil pressure with a mech. gauge. I would buy a mech. gauge and install it permanently in the truck so oil pressure can be monitored.

The gauge in the dash is not a "gauge" it is more of a indicator of pressure. The sending unit is only a switch that closes with any oil pressure. There is a resistor in the cluster that is designed to place the needle somewhere in the normal range. It has NO way of indicating how much oil pressure is there, just that there is some. It is very common for them to read differently as they get older.
X2

although the factory dummy guage can be modified to work as a normal guage, I would just install an aftermarket mechanical guage

either way, the first thing you need to do is put a different guage in it (perm or temp) and verify what the oil pressure actually is
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Old January 22nd, 2010, 03:04 AM   #7
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If it truly had 0 psi you know it ! and if you don't it'll lock up shortly there after the loud banging and clattering started . . .

I would also do and oil change and run 10w-40 in the winter and 20w-50 in the summer.

Mike
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Old January 22nd, 2010, 04:28 AM   #8
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It seems like every fullsize ford truck has this problem my dad had a 1990 f150 I have a 90 bronco and my brother has a 93 f150 and the all had the same issue I replaced the sending unit and it made the gauge actully read better but a mechanical gauge would be your best bet
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Old January 22nd, 2010, 12:11 PM   #9
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If it truly had 0 psi you know it ! and if you don't it'll lock up shortly there after the loud banging and clattering started . . .

I would also do and oil change and run 10w-40 in the winter and 20w-50 in the summer.

Mike
Yeah, like I said my old 94 Ford had what I thought was a bad gauge at first, then before I knew it the motor was toast! I'm gonna go pickup a mechanical gauge right now. It currently has 10w-40 in it.
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Old January 22nd, 2010, 09:22 PM   #10
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im talking about worn bearings not spun bearings. if all your bearings are worn cam bearings, rods, and mains. they dont have to spin to be worn. im hoping that its just something wrong with the gauge just trying to explain my self a little better
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Old January 23rd, 2010, 01:03 AM   #11
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"spun bearing" is a phrase alot of people use without truly understanding what it means...they may mean a worn bearing, and thats what they are thinking, but they hear the phrase "spun bearings" and dont understand that there even is a difference, let alone what that difference is
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Old February 17th, 2010, 11:00 PM   #12
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Problem has already been solved guys. The gauge was just fucked. I tried replacing the sending unit and now the gauge doesn't work at all, so I just said f**k it and its been fine for 3k miles. Hooked a mechanical gauge up to it and it reads 55 PSI at idle.
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