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I have a 90 mustang lx 5.0 5spd. Not to long ago I lost oil pressure out of no where and the engine was ticking a bit. My assumtion was a seezed oil pump. My assumtion was luckly correct. I chose to replace the busted old pump with a HV piece which worked outstanding for about four days then all the sudden no oil pressure. I've started only once since I lost pressure and the motor isn't making any wierd noises but it has a slight shudder that vibrates the steering wheel during idle. Is it possible that I got a bad piece or do I really need a HV piece; since it takes more power to turn the HV pump. I still think it may be the pump and a snapped oil pump driveshaft, but any other opinions are welcome.
My stang mods are: K&N,70mmTB,Cobra Intake,MSD Blaster coil,BBK equal length shorty headers,off road H pipe, 3.73's,Hurst short
shifter
 

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did u replace the pickup assembly when you replaced the pump on most 5.0s the pickup assembly is so long it clogs up real easily and another thing how many miles was on it at the time if it had a lot did you take the time to look at the connecting rod bearings or your crankshaft bearings? doing all that work to put the oil pump and not sliding in some new bearings is a total waste of work in my opinion i already di it once in my 5.0 i dont know why either but i regreted it right soon after
 

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Doesnt matter now, bearings and prolly the crank are out to lunch now, your gonna have to pull the motor, drop the crank, prolly have it ground, put new bearings in, fix the oil pump, aw hell, rebuild the whole darn motor while ur at it...
 

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I think you have to ask yourself what is causing the oil pump or pump drive to fail. When the pan was off was there bits of valve seals in the pan? These have been known to seize more than a few pumps. Did you check the distributor drive gear roll pin to see if was sheared? Was the drive shaft twisted? These are all things that you would have seen when the pan was off and you were replacing the pump. When the pump seized was there any other damage? The drive shaft would have snapped also if the pump seized. I would start by draining the oil through a paint filter and see what is in the oil, if it is full of babbit or steel or copper I would pull the engine and do a complete rebuild.
 

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Funny you should mention snapping the shaft. I seized the oil pump in an old 302 I had. When I opened her up it actually looked like she sucked up a piece of the screen. But the funny thing was she twisted the shaft like a pretzel and then wiped out the bottom of the distributor but the shaft never broke. But no matter what happened I agree that the engine has probably suffered some internal damage.
 

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Those 5.0 fords are known for bad sending units i change em all the time.Sometimes they give false readings.Try a new one.
 

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Originally posted by shagginwagonvic:
<strong>did u replace the pickup assembly when you replaced the pump on most 5.0s the pickup assembly is so long it clogs up real easily and another thing how many miles was on it at the time if it had a lot did you take the time to look at the connecting rod bearings or your crankshaft bearings? doing all that work to put the oil pump and not sliding in some new bearings is a total waste of work in my opinion i already di it once in my 5.0 i dont know why either but i regreted it right soon after</strong><hr></blockquote>
 

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Originally posted by JdOwNj:
<strong>Doesnt matter now, bearings and prolly the crank are out to lunch now, your gonna have to pull the motor, drop the crank, prolly have it ground, put new bearings in, fix the oil pump, aw hell, rebuild the whole darn motor while ur at it...</strong><hr></blockquote>

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I had a 390 that was doing the same thing. No oil pres put a new oil pump and a HV. Turned after two new pumps crank bearings were shot. The line bore was no right.
 
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