February 23, 2005I have a '92 f-150 supercab logbed 4x4 auto. I have replaced piston rings, rod bearings, and oil pump. After that it ran great. 400 miles later, I'm driving down a highway and the oil pressure guage starts fluttering and there was a tremendous loss off power. The pressure would go up a little if I gave it some gas, but then go right back down. So I get off on the closest exit and have it towed back to my house. The guy who towed it said it was definitely the oil pump. So pulled the oil pan out and there were some small metal shavings in it. I figured it was just metal from the new rings being broken in. I cleaned out the oil pickup tube, replaced the oil pump, and put it all back together. The truck started up fine and ran pretty good, but once it warmed up the oil pressure went down and there was some top-end noise. I shut the truck off and this is where I'm at now. Any suggestions to what the problem is would be appreciated.
Forums : General Tech Questions : 92 Ford F150 5.0,oil pressure (633 Views)
February 23, 2005Good f--king luck with this problem ...... I've got the same problem with a 3.8 V6 Mustang engine. .... I posted the same question on Truck World before it was taken over by Ten Sites and never got a 'good' answer. With the car I'm dealing with, happens to be my brother's car, I've changed the oil pump, oil pressure regulator valve, cleaned all the oil galleys out, replaced the oil pressure sending switch and the guage in the dash, put in 20W50 motor oil and Lucas oil stabilizer and still, start up - plenty of pressure, once warm - nothing ...... My next thing will be to replace the timing case cover. I figure since the pressure regulator is in the cover, maybe the bore it slides in, is so worn out, that it's causing the valve to skew giving me the problem ..... That's the only thing I can think of other than rebuilding the whole engine or replacing it .........
August 26, 2005Could you explain what was involved to replace the oil pump on your 1992 F-150 4x4 5.0L...Dealer wants $900 for replacement of a $26 part!
August 31, 2005I did not have that problem with my 91 f150 5.0, but a couple of possibilities come to mind.
1. try different brand oil filter. (you have probably already done that)
2. the oil pump should be driven by a gear. It is possible that that gear assembly is worn enough to lose pressure as the oil heats up and cause the problem. I don't remember if it would be powered by crank or camshaft, but I think it may have been camshaft.If it is powered by cam, then check camshaft bearings. (camshaft bearings could also explain loss of power by slightly changing the timing)
of course, I could be way off on this one. but figured I would post my thoughts.
September 1, 2005Mike, Your oil pump is located in the oil pan as a separate unit, meaning the pump unbolts as one piece. The distributor runs it by way of a 'hex' shaped rod that goes between the two. A lot of work is involved changing your pump. Mine, in the 3.8 V6, on the other hand is on the 'outside' of the timing case cover, like the GM 3.8's. It's two interlocking gears that sit in a cavity that a plate bolts over. Four bolts, two gears and mine's done in about an hour ......