Oil Pressure
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
when i took my oil screen out of my 4.9 because of low oil pressure i filled a paint can top with sludge from the screen and tube.
i still did not get it all out.
i bought it with this problem.
the previous owner knew nothing about trucks or women.
i still did not get it all out.
i bought it with this problem.
the previous owner knew nothing about trucks or women.
Elder User
Joined: Nov 2006
Posts: 614
Likes: 0
From: Pensacola, FL
first thing to do is hook up a mechanical gauge and actually watch what the oil pressure is doing when cold and as it gets hot. if you drop the pan, the screen is about $15 and buy the pump while you have it apart, $40. better to do that while you have the pan off then get it all back together and a month later the pump goes out anyway.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Originally Posted by quicklook2
the previous owner knew nothing about trucks or women.
95Ford4x4 is right - the first thing to do is put a mechanical gauge on it and see what's really going on. The stock gauge tells you virtually nothing.
Freshman User
Joined: Nov 2003
Posts: 49
Likes: 0
[QUOTE=dagray3]Straight 30 weight oil gets thinner as it heats up. But, 10W30 or 10W40 get thicker as they heat up. The numbers are the oil viscosity when cold and then when hot. It's some crazy effect of polymer chains shrinking in legnth when they get hot. QUOTE]
The oil does NOT get thicker when it warms up.
Take a 10W30.....
At room temp it is thick as # 10
At operating temp. is is as thick as #30 at OPERATING temp. Thicker than #10 will be at the same OPERATING temp. but thinner than #10 would be room temp.
If you don't believe me drain that 10W30 when the oil is hot and see for yourself if it is thicker than 10W30 at room temp. It won't be.
As for the original question.... I'd pull the pan, check the screen and replace the pump. A new one is less than $50, cheap insurance....
The oil does NOT get thicker when it warms up.
Take a 10W30.....
At room temp it is thick as # 10
At operating temp. is is as thick as #30 at OPERATING temp. Thicker than #10 will be at the same OPERATING temp. but thinner than #10 would be room temp.
If you don't believe me drain that 10W30 when the oil is hot and see for yourself if it is thicker than 10W30 at room temp. It won't be.
As for the original question.... I'd pull the pan, check the screen and replace the pump. A new one is less than $50, cheap insurance....
Last edited by alteran; May 15, 2007 at 04:00 PM.
