Join Date: Sep 2012
Location: RENO NV
Bronco Info: 93 XLT, 5.8, E4OD, manual Xfer & hubs
No oil pressure
Here's something to keep in mind on older Ford trucks (since we are talking FSB's means all of us). When I bought my FSB, on the 60 mile ride home, it ran great until, about 5 miles from home I went around a sharp turn and oil pressure went to 0. I immediately shut it down and got it towed home. The problem was a clogged screen on the oil pump pickup tube. The material plugging it was hard, black plastic like material. Since then, I spoke with a F-250 owner who lost his 5.8 on the highway when "the oil pump drive shaft broke". As we discuss this, we realized his problem was the same as mine but since he was going 75 miles an hour, the suddenly dry oil pump seized up and wrung the shaft off. He didn't see the oil pressure go to 0 since this probably all happened in less than 30 seconds at highway speed. It also took out his rod bearings. A little research on my part has shown that clogged oil screens are not uncommon on older small block Fords. It will probably happen to every one eventually. What I have found is that the material that's blocking the screen comes from the valve stem seals which are made like little umbrellas. The "skirts" from these umbrellas begin to crack and fall off after 10-15 years and they find their way into the oil pan where they clog the screen. The interesting thing about the seals is the skirts don't appear to be necessary to control oil burning as even after the seals are reduced to just a ring around the valve stem, the engines still don't smoke at start-up. I remember in the 60's Chevy had a similar seal but quit those for just an o-ring style just under the valve retaining clips. A word to the wise might be to plan on replacing your pickup tube/screen and wiping out the oil pan when you feel the need to get dirty. At this point in time, there probably isn't much of the seal skirts left on any FSB out there so just replacing the screen and a wiping out of the pan would be a one-time thing. I didn't have any luck getting my pan completely off but was able to drop it enough to reach inside and do the needed work. I put in a new oil pump but examining the old one afterwards made it clear I could have reused it as it was not damaged. An oil pump is such a simple thing that if you currently have good oil pressure, replacing it with new is a waste. The price of a pan gasket (get the new one-piece) and a pickup tube (you can't clean them) is less than $50 and may well save your engine. Small block Fords will go 300k plus easily if you take care of them.