351w oil pressure problems
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Joined: Feb 2004
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351w oil pressure problems
i have a 1992 f-150 called old blue. the old girls oil presure just dropped out one day after our drive home frome work. Then after checking her vitals with a mechanical guage and performing a 3-day oil pump byopsee she dropped on me again this morning. presure is up while driving but flatlined at idle. I also gave her a small dose of sending unit asprin with no response. please help me I LOVE my OLD BLUE.
Posting Guru
Joined: Sep 1999
Posts: 2,297
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From: Indiana
blue oval blues
High mileage enigne?
I am assuming you mean you changed the oil pump and verified the low oil pressure with a mechanical gauge?
More than likely the bearings in the bottom end are worn out.
High mileage enigne?
I am assuming you mean you changed the oil pump and verified the low oil pressure with a mechanical gauge?
More than likely the bearings in the bottom end are worn out.
Moderator
Joined: Jun 2003
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From: Calhoun GA
I have this problem with mine. So I use 10w40 motor oil in the winter and 20w50 in the summer, and the pressure stays solid at all RPM's. I need to pull the motor for a rebuild, but I have to finish the race truck first before I start another project.
Post Fiend
Joined: Nov 2001
Posts: 14,947
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From: Topsfield, MA
The oil pressure should be between 40-60 psi at idle on a warm engine. IF the oil pressure comes up to 40-60 when the engine is cold, but drops down when it warms up (at idle still) than it's the engines bearings that are worn and the engine needs a rebuild. When the engine warms up the oil thins out so it creates spaces and gaps which drop oil pressure.
New User
Joined: Jan 2004
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From: Vancouver Island
Did you say you gave the sender aspirin ?.
Well if you didn't replace the sender i would make that my next move before a rebuild, especially if the pressure just dropped out on you ,bearings wear out a little slower than that .
Unless you had no oil at all
Well if you didn't replace the sender i would make that my next move before a rebuild, especially if the pressure just dropped out on you ,bearings wear out a little slower than that .
Unless you had no oil at all
Senior User
Joined: Jun 2003
Posts: 352
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From: Tillamook, Ore
In the 90's the oil sender is just a switch. At about 8 lbs pressure it will read half way on the guage, less than that it will drop to nothing. Mine started doing this overnight and I checked it with a mechanical gauge, had around 40 lbs on startup and dropped to less than 10 when hot. About a week later it started knocking. Sorry about the bad news.
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