Need Help
08-25-2007, 01:31 PM
#1
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Need Help
I have a 1990 F 150 and It starts fine ,runs good but when it warms up the oil pressure drops. When you try to drive the oil pressure drops to zero. I have put in a new oil sensor, new oil pump, new oil,new plugs, new rotary cap, new main bearings, new seals and gaskets,redid the timing. Anyone out there who can help me? It was my first brand new truck and I would like to keep it and drive it.
08-25-2007, 02:36 PM
#2
Senior Member
Some thoughts / WAGs -
Oil too thin - correct grade being used, hasn't been diluted with fuel, water, etc.?
Pump relief assembly hanging up?
Inlet tube too high in the sump, or has a hole or leak, or inlet screen clogged?
Oil gauge working properly, perhaps take a local gauge reading to verify.
Oil pump clearances in spec., especially between gears and cover plate?
Oil pump output obstructed, or oil filter internal failure (FRAM --- arrrrgh!)?
Oil too thin - correct grade being used, hasn't been diluted with fuel, water, etc.?
Pump relief assembly hanging up?
Inlet tube too high in the sump, or has a hole or leak, or inlet screen clogged?
Oil gauge working properly, perhaps take a local gauge reading to verify.
Oil pump clearances in spec., especially between gears and cover plate?
Oil pump output obstructed, or oil filter internal failure (FRAM --- arrrrgh!)?
08-27-2007, 03:04 PM
#3
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Looks like you replaced everything else, how about the guage itself?
I'm assuming you've been driving it?
If the engine hasn't seized up yet with zero oil pressure, maybe its the guage giving a false reading.
SOHC
I'm assuming you've been driving it?
If the engine hasn't seized up yet with zero oil pressure, maybe its the guage giving a false reading.
SOHC
